Pinastry Science Duty Logs

Moderator: Kermie Mistwallow

User avatar
Ferre Flamand
Sciences - Lieutenant
Sciences - Lieutenant
Posts: 358
Joined: 211111.0543
Duty Post: Vice Chief Science Officer
Ship/Station Posted: SS Tranquility
Grid: Second Life
Location: Belgium
Has thanked: 185 times
Been thanked: 54 times
Contact:

220904.2321

Tranquility Station/Ops + Tranquility Science Lab - Stardate 22090500.15
Reporting Officer: Lt Ferre Flamand
Other Officers on Duty: 4 NPC's
Duty Log
Daily Scientific and Observation Report


Surface environmental conditions

Nitrogen = 77.09 percent
Oxygen = 20.18 percent
Argon = 0.87 percent
Neon, Helium, Krypton = 0.0008 percent
Carbon dioxide = 0.23 percent
Water vapor = 0 - 4 percent

Fauna and Flora = All specific data found in local database.
Daystar condition = Thermal radiation within acceptable margins. Four moderately active sunspot-groupings detected with some active flares. Moderate to slighly elevated communication interference can be expected. Warming-up sequence at normal rate within range.

Betelgeuse (Alpha Orionis) its variable magnitude intervals within range. Brightened with 0.02 magnitude.

Today's project : Experimental validation of exoplanet centring strategies for high dispersion coronagraphy.

The combination on large ground-based telescopes of extreme adaptive optics (ExAO), coronagraphy and high-dispersion spectroscopy is starting to emerge as a powerful technique for the direct characterisation of giant exoplanets. High spectral resolution not only brings a major gain in terms of accessible spectral features, but it also enables to better disentangle between the stellar and planetary signals thanks to the much higher spectral content. On-going projects such as KPIC for Keck, REACH for Subaru and HiRISE for the VLT base their observing strategy on the use of a few science fibres, one of which is dedicated to sampling the PSF of the planet, while the others sample the stellar residuals in the speckle field. The main challenge in this approach is to blindly centre the science fibre on the planet’s PSF, with typically a tolerance of less than one resolution element (0.1 λ/D). Several possible centring strategies can be adopted, either based on calibration fibres retro-injecting signal to mark the position of the science fibres or based on the use of focal-plane features introduced by the ExAO system. In this proceeding, we describe different possible approaches and we compare their centring accuracy using the MITHiC high-contrast imaging testbed. For this work, MITHiC has been upgraded to reproduce a setup close to the one that will be adopted in HiRISE, the coupling system that will soon be implemented between VLT/SPHERE and VLT/CRIRES+. Our results demonstrate that reaching a specification accuracy of 0.1 λ/D is extremely challenging regardless of the chosen centring strategy. It requires a high level of accuracy at every step of the centring procedure, which can be reached with very stable instruments. We studied the contributors to the centring error in the case of MITHiC and we quantified some of the most important terms.

-- end log --

:communicator: Lt Ferre Flamand
Vice Chief Science Officer
SS Tranquility
User avatar
Ferre Flamand
Sciences - Lieutenant
Sciences - Lieutenant
Posts: 358
Joined: 211111.0543
Duty Post: Vice Chief Science Officer
Ship/Station Posted: SS Tranquility
Grid: Second Life
Location: Belgium
Has thanked: 185 times
Been thanked: 54 times
Contact:

220905.2305

Tranquility Station/Ops + Tranquility Science Lab - Stardate 22090600.05
Reporting Officer: Lt Ferre Flamand
Other Officers on Duty: 4 NPC's
Duty Log
Daily Scientific and Observation Report


Surface environmental conditions

Nitrogen = 77.10 percent
Oxygen = 20.20 percent
Argon = 0.89 percent
Neon, Helium, Krypton = 0.0008 percent
Carbon dioxide = 0.20 percent
Water vapor = 0 - 4 percent

Fauna and Flora = All specific data found in local database.
Daystar condition = Thermal radiation within acceptable margins. Three moderately active sunspot-groupings detected with some active flares. Moderate to slighly elevated communication interference can be expected. Warming-up sequence at normal rate within range.

Betelgeuse (Alpha Orionis) its variable magnitude intervals within range. Sudden drop of a full magnitude (1.03).

Today's project : Status update for MAPS, the MMT AO exoPlanet characterization System.

The MMT Adaptive optics exoPlanet characterization System (MAPS) is an exoplanet characterization program that encompasses instrument development, observational science, and education. The instrument we are developing for the 6.5m MMT observatory is multi-faceted, including a refurbished 336-actuator adaptive secondary mirror (ASM); two pyramid wavefront sensors (PyWFS's); a 1-kHz adaptive optics (AO) control loop; a high-resolution and long-wavelength upgrade to the Arizona infraRed Imager and Echelle Spectrograph (ARIES); and a new-AO-optimized upgrade to the MMT-sensitive polarimeter (MMT-Pol). With the completed MAPS instrument, we will execute a 60-night science program to characterize the atmospheric composition and dynamics of ~50-100 planets around other stars. The project is approaching first light, anticipated for Summer/Fall of 2422. With the electrical and optical tests complete and passing the review milestone for the ASM’s development, it is currently being tuned. The PyWFS's are being built and integrated in their respective labs: the visible-light PyWFS at the University of Arizona (UA), and the infrared PyWFS at the University of Toronto (UT). The top-level AO control software is being developed at UA, with an on-sky calibration algorithm being developed at UT. ARIES development continues at UA, and MMT-Pol development is at the University of Minnesota. The science and education programs are in planning and preparation. We will present the design and development of the entire MAPS instrument and project, including an overview of lab results and next steps.

-- end log --

:communicator: Lt Ferre Flamand
Vice Chief Science Officer
SS Tranquility
User avatar
Ferre Flamand
Sciences - Lieutenant
Sciences - Lieutenant
Posts: 358
Joined: 211111.0543
Duty Post: Vice Chief Science Officer
Ship/Station Posted: SS Tranquility
Grid: Second Life
Location: Belgium
Has thanked: 185 times
Been thanked: 54 times
Contact:

220906.2354

Tranquility Station/Ops + Tranquility Science Lab - Stardate 22090700.30
Reporting Officer: Lt Ferre Flamand
Other Officers on Duty: 4 NPC's
Duty Log
Daily Scientific and Observation Report


Surface environmental conditions

Nitrogen = 77.08 percent
Oxygen = 20.17 percent
Argon = 0.89 percent
Neon, Helium, Krypton = 0.0008 percent
Carbon dioxide = 0.24 percent
Water vapor = 0 - 4 percent

Fauna and Flora = All specific data found in local database.
Daystar condition = Thermal radiation within acceptable margins. Three moderately active sunspot-groupings detected with some active flares. Moderate to slighly elevated communication interference can be expected. Warming-up sequence at normal rate within range.

Betelgeuse (Alpha Orionis) its variable magnitude intervals within range. No magnitude change in the last 24 Hrs.

Today's project : GPI 2.0: Characterizing Self-Luminous Exoplanets Through Low-Resolution Infrared Spectroscopy.

Direct imaging characterization of extrasolar planets is often done at low spectral resolution. We model the spectrograph for the Gemini Planet Imager upgrade (GPI 2.0) and assess the instrument's potential for allowing observers to constrain exoplanet properties through analysis of near-infrared spectra. We simulated noisy observations followed by calculations of posterior distributions from maximum likelihood comparison with the Sonora 2418 model grid. Preliminary results suggest that GPI 2.0 should allow observers to constrain temperature with sufficient accuracy, but gravity remains largely uncertain. We also explore the effects of incorporating convolution with the instrument line spread function into our simulation and compare the results with our preliminary findings.

-- end log --

:communicator: Lt Ferre Flamand
Vice Chief Science Officer
SS Tranquility
User avatar
Ferre Flamand
Sciences - Lieutenant
Sciences - Lieutenant
Posts: 358
Joined: 211111.0543
Duty Post: Vice Chief Science Officer
Ship/Station Posted: SS Tranquility
Grid: Second Life
Location: Belgium
Has thanked: 185 times
Been thanked: 54 times
Contact:

220908.0143

Tranquility Station/Ops + Tranquility Science Lab - Stardate 22090802.30
Reporting Officer: Lt Ferre Flamand
Other Officers on Duty: 4 NPC's + a brief visit of Doc Narek with an interesting biological experiment.
Duty Log
Daily Scientific and Observation Report


Surface environmental conditions

Nitrogen = 77.07 percent
Oxygen = 20.15 percent
Argon = 0.87 percent
Neon, Helium, Krypton = 0.0008 percent
Carbon dioxide = 0.21 percent
Water vapor = 0 - 4 percent

Fauna and Flora = All specific data found in local database.
Daystar condition = Thermal radiation within acceptable margins. FOUR !!! highly active sunspot-groupings detected with VERY active flares. Highly elevated communication interference can be expected. Warming-up sequence at normal rate within range.

Tornado warning !!! This week a major supercell cluster will arrive at our site with possibly multiple tornado's in the range of F3 - F4. All medics must be prepared for eventual casualties. There will be no more time to read and sitting somewhere, looking annoyed outside !

Betelgeuse (Alpha Orionis) its variable magnitude intervals within range. No magnitude change in the last 24 Hrs.

Today's project : New Dynamical State and Habitability of the HD 45364 Planetary System.

Planetary systems with multiple giant planets provide important opportunities to study planetary formation and evolution. The HD 45364 system hosts two giant planets that reside within the Habitable Zone (HZ) of their host star and was the first system discovered with a 3:2 mean motion resonance (MMR). Several competing migration theories with different predictions have previously provided explanations regarding the observed resonance through dynamical simulations that utilized limited data. Here, over ten years since the original discovery, we revisit the system with a substantially increased radial velocity (RV) sample from HARPS and HIRES that significantly extend the observational baseline. We present the revised orbital solutions for the two planets using both Keplerian and dynamical models. Our RV models suggest orbits that are more circular and separated than those previously reported. As a result, predicted strong planet-planet interactions were not detected. The system dynamics were reanalyzed, and the planet pair was found to exhibit apsidal behavior of both libration and circulation, indicating a quasi-resonance state rather than being truly in MMR. The new orbital solution and dynamical state of the system confirm migration models that predicted near circular orbits as the preferred scenario. We also study the habitability prospects of this system and found that an additional Earth-mass planet and exomoons in the HZ are possible. This work showcases the importance of continued RV observation and its impact on our knowledge of the system's dynamical history. HD 45364 continues to be an interesting target for both planetary formation and habitability studies.
-- end log --

:communicator: Lt Ferre Flamand
Vice Chief Science Officer
SS Tranquility
User avatar
Ferre Flamand
Sciences - Lieutenant
Sciences - Lieutenant
Posts: 358
Joined: 211111.0543
Duty Post: Vice Chief Science Officer
Ship/Station Posted: SS Tranquility
Grid: Second Life
Location: Belgium
Has thanked: 185 times
Been thanked: 54 times
Contact:

220909.0000

Tranquility Station/Ops + Tranquility Science Lab - Stardate 22090900.45
Reporting Officer: Lt Ferre Flamand
Other Officers on Duty: 4 NPC's
Duty Log
Daily Scientific and Observation Report


Surface environmental conditions

Nitrogen = 77.08 percent
Oxygen = 20.16 percent
Argon = 0.89 percent
Neon, Helium, Krypton = 0.0008 percent
Carbon dioxide = 0.23 percent
Water vapor = 0 - 4 percent

Fauna and Flora = All specific data found in local database.
Daystar condition = Thermal radiation within acceptable margins. Two highly active sunspot-groupings detected with rather active flares. Moderate to high elevated communication interference can be expected. Warming-up sequence at normal rate within range.

No more tornado warning. There's been a sudden direction change in El Abuelo (the Pinastri variant of El Nino).

Betelgeuse (Alpha Orionis) its variable magnitude intervals within range. Slight rise with 0.21 magnitude.

Today's project : The iLocater cryostat and thermal control system: enabling extremely precise radial velocity measurements for diffraction-limited spectrographs.

Extremely precise radial velocity (EPRV) measurements are critical for characterizing nearby terrestrial worlds. EPRV instrument precisions of σRV=1−10cm/s are required to study Earth-analog systems, imposing stringent, sub-mK, thermo-mechanical stability requirements on Doppler spectrograph designs. iLocater is a new, high-resolution (R=190,500 median) near infrared (NIR) EPRV spectrograph under construction for the dual 8.4 m diameter Large Binocular Telescope (LBT). The instrument is one of the first to operate in the diffraction-limited regime enabled by the use of adaptive optics and single-mode fibers. This facilitates affordable optomechanical fabrication of the spectrograph using intrinsically stable materials.
We present the final design and performance of the iLocater cryostat and thermal control system which houses the instrument spectrograph. The spectrograph is situated inside an actively temperature-controlled radiation shield mounted inside a multi-layer-insulation (MLI) lined vacuum chamber. The radiation shield provides sub-mK thermal stability, building on the existing heritage of the Habitable-zone Planet Finder (HPF) and NEID instruments. The instrument operating temperature (T=80−100K) is driven by the requirement to minimize detector background and instantaneous coefficient of thermal expansion (CTE) of the materials used for spectrograph fabrication. This combination allows for a reduced thermomechanical impact on measurement precision, improving the scientific capabilities of the instrument.

After my scientific work at Tranquility Station I went down to the surface and did some voluntary greeter service to welcome/inform potential visitors. I think I'm going to apply for greeter because there's not really someone doing this I think. Thus far no visitors but it's not the end of the world (this one or another :))

-- end log --

:communicator: Lt Ferre Flamand
Vice Chief Science Officer
SS Tranquility
User avatar
Ferre Flamand
Sciences - Lieutenant
Sciences - Lieutenant
Posts: 358
Joined: 211111.0543
Duty Post: Vice Chief Science Officer
Ship/Station Posted: SS Tranquility
Grid: Second Life
Location: Belgium
Has thanked: 185 times
Been thanked: 54 times
Contact:

220912.0055

Tranquility Station/Ops + Tranquility Science Lab - Stardate 22091202.00
Reporting Officer: Lt Ferre Flamand
Other Officers on Duty: 4 NPC's
Duty Log
Daily Scientific and Observation Report


Surface environmental conditions

Nitrogen = 77.06 percent
Oxygen = 20.15 percent
Argon = 0.88 percent
Neon, Helium, Krypton = 0.0008 percent
Carbon dioxide = 0.25 percent
Water vapor = 0 - 4 percent

Fauna and Flora = All specific data found in local database.
Daystar condition = Thermal radiation within acceptable margins. Two highly active sunspot-groupings detected with rather active flares. Moderate to high elevated communication interference can be expected. Warming-up sequence at normal rate within range.

Betelgeuse (Alpha Orionis) its variable magnitude intervals within range. Slight rise with 0.21 magnitude.


Today's project : ExoMol line lists – XLVII. Rovibronic molecular line list of the calcium monohydroxide radical (CaOH)

Any future detection of the calcium monohydroxide radical (CaOH) in stellar and exoplanetary atmospheres will rely on accurate molecular opacity data. Here, we present the first comprehensive molecular line list of CaOH covering the A~2Π–X~2Σ+ rotation-vibration-electronic and X~2Σ+–X~2Σ+ rotation-vibration bands. The newly computed OYT6 line list contains over 24.2 billion transitions between 3.2 million energy levels with rotational excitation up to J = 175.5. It is applicable to temperatures up to T = 3000 K and covers the 0–35 000 cm−1 range (wavelengths λ > 0.29 μm) for rotational, rotation-vibration and the A~2Π–X~2Σ+ electronic transition. The strong band around 16 000 cm−1 (λ = 0.63 μm) is likely to be of interest in future astronomical observations, particularly in hot rocky exoplanets where temperatures can become extremely high. The OYT6 line list has been generated using empirically-refined X~2Σ+ and A~2Π state potential energy surfaces, high-level ab initio transition dipole moment surfaces and a rigorous treatment of both Renner-Teller and spin-orbit coupling effects, which are necessary for correctly modelling the CaOH spectrum. Post-processing of the CaOH line list has been performed so as to tailor it to high-resolution applications, i.e. by replacing calculated energy levels with more accurate empirically-derived values (where available), hence improving the accuracy of the predicted line positions in certain regions. The OYT6 line list is available from the ExoMol database at http://www.exomol.com and the CDS astronomical database.


After my scientific work at Tranquility Station I went down to the surface and did some voluntary greeter service to welcome/inform potential visitors. No visitors but that's probably because of the time of the day.

-- end log --

:communicator: Lt Ferre Flamand
Vice Chief Science Officer
SS Tranquility
User avatar
Ferre Flamand
Sciences - Lieutenant
Sciences - Lieutenant
Posts: 358
Joined: 211111.0543
Duty Post: Vice Chief Science Officer
Ship/Station Posted: SS Tranquility
Grid: Second Life
Location: Belgium
Has thanked: 185 times
Been thanked: 54 times
Contact:

220912.2313

Tranquility Station/Ops + Tranquility Science Lab - Stardate 22091200.01
Reporting Officer: Lt Ferre Flamand
Other Officers on Duty: 4 NPC's
Duty Log
Daily Scientific and Observation Report


Surface environmental conditions

Nitrogen = 77.07 percent
Oxygen = 20.15 percent
Argon = 0.88 percent
Neon, Helium, Krypton = 0.0008 percent
Carbon dioxide = 0.23 percent
Water vapor = 0 - 4 percent

Fauna and Flora = All specific data found in local database.
Daystar condition = Thermal radiation within acceptable margins. Two highly active sunspot-groupings detected with rather active flares. Moderate to high elevated communication interference can be expected. Warming-up sequence at normal rate within range.

Betelgeuse (Alpha Orionis) its variable magnitude intervals within range. Slight rise with 0.04 magnitude.


Today's project : Impact of stellar flares on the chemical composition and transmission spectra of gaseous exoplanets orbiting M dwarfs.

Stellar flares of active M dwarfs can affect the atmospheric composition of close-orbiting gas giants, and can result in time-dependent transmission spectra. We aim to examine the impact of a variety of flares, differing in energy, duration, and occurrence frequency, on the composition and spectra of close-orbiting, tidally locked gaseous planets with climates dominated by equatorial superrotation. We used a series of pseudo-2D photo- and thermochemical kinetics models, which take advection by the equatorial jet stream into account, to simulate the neutral molecular composition of a gaseous planet (effective temperature 800 K) that orbits a flaring M dwarf. We then computed transmission spectra for the evening and morning limb. We find that the upper regions of the dayside and evening limb are heavily depleted in CH4 and NH3 up to several days after a flare with a total radiative energy of 2×1033 erg. Molar fractions of C2H2 and HCN are enhanced up to a factor three on the nightside and morning limb after day-to-nightside advection of photodissociated species. CH4 depletion reduces transit depths by 100-300 parts per million (ppm) on the evening limb and C2H2 production increases the 14 micron feature up to 350 ppm on the morning limb. We find that repeated flaring drives the atmosphere to a composition that differs from its pre-flare distribution and that this translates to a permanent modification of the transmission spectrum. We show that single high-energy flares can affect the atmospheres of close-orbiting gas giants up to several days after the flare event, during which their transmission spectra are altered by several hundred ppm. Repeated flaring has important implications for future retrieval analyses of exoplanets around active stars, as the atmospheric composition and resulting spectral signatures substantially differ from models that do not include flaring.


-- end log --

:communicator: Lt Ferre Flamand
Vice Chief Science Officer
SS Tranquility
User avatar
Ferre Flamand
Sciences - Lieutenant
Sciences - Lieutenant
Posts: 358
Joined: 211111.0543
Duty Post: Vice Chief Science Officer
Ship/Station Posted: SS Tranquility
Grid: Second Life
Location: Belgium
Has thanked: 185 times
Been thanked: 54 times
Contact:

220914.0001

Tranquility Station/Ops + Tranquility Science Lab - Stardate 22091301.00
Reporting Officer: Lt Ferre Flamand
Other Officers on Duty: 4 NPC's
Duty Log
Daily Scientific and Observation Report


Surface environmental conditions

Nitrogen = 77.09 percent
Oxygen = 20.17 percent
Argon = 0.88 percent
Neon, Helium, Krypton = 0.0008 percent
Carbon dioxide = 0.23 percent
Water vapor = 0 - 4 percent

Fauna and Flora = All specific data found in local database.
Daystar condition = Thermal radiation within acceptable margins. Two highly active sunspot-groupings detected with rather active flares. Moderate to high elevated communication interference can be expected. Warming-up sequence at normal rate within range.

Betelgeuse (Alpha Orionis) its variable magnitude intervals within range. Slight rise with 0.03 magnitude.


Today's project : Smaller Sensitivity of Precipitation to Surface Temperature under Massive Atmospheres.

Precipitation and its response to forcings is an important aspect of planetary climate system. In this study, we examine the strength of precipitation in the experiments with different atmospheric masses and their response to surface warming, using three global atmospheric general circulation models (GCMs) and one regional cloud-resolving model (CRM). We find that precipitation is weaker when atmospheric mass is larger for a given surface temperature. Furthermore, the increasing rate of precipitation with increasing surface temperature under a larger atmospheric mass is smaller than that under a smaller atmospheric mass. These behaviors can be understood based on atmospheric or surface energy balance. Atmospheric mass influences Rayleigh scattering, multiple scattering in the atmosphere, pressure broadening, lapse rate, and thereby precipitation strength. These results have important implications on the climate and habitability of early Earth, early Mars, and exoplanets with oceans.




-- end log --

:communicator: Lt Ferre Flamand
Vice Chief Science Officer
SS Tranquility
User avatar
Ferre Flamand
Sciences - Lieutenant
Sciences - Lieutenant
Posts: 358
Joined: 211111.0543
Duty Post: Vice Chief Science Officer
Ship/Station Posted: SS Tranquility
Grid: Second Life
Location: Belgium
Has thanked: 185 times
Been thanked: 54 times
Contact:

220915.0149

Tranquility Station/Ops + Tranquility Science Lab - Stardate 22091502.00
Reporting Officer: Lt Ferre Flamand
Other Officers on Duty: 4 NPC's
Duty Log
Daily Scientific and Observation Report


Surface environmental conditions

Nitrogen = 77.08 percent
Oxygen = 20.14 percent
Argon = 0.88 percent
Neon, Helium, Krypton = 0.0008 percent
Carbon dioxide = 0.26 percent
Water vapor = 0 - 4 percent

Fauna and Flora = All specific data found in local database.
Daystar condition = Thermal radiation within acceptable margins. Two moderatly active sunspot-groupings detected with rather minor flares. Low communication interference can be expected. Warming-up sequence at normal rate within range.

Betelgeuse (Alpha Orionis) its variable magnitude intervals within range. Slight rise with 0.04 magnitude.


Today's project : Extremely Inclined Orbit of S-type Planet γ Cep Ab Induced by Eccentric Kozai-Lidov Mechanism.

γ Cep Ab is a typical S-type planet, which occupies a nearly perpendicular planetary orbit relative to the binary. Here we use the Markov Chain Monte Carlo (MCMC) sampler to conduct full N-body fitting and derive self-consistent orbital solutions for this hierarchical system. Then we employ the Eccentric Kozai-Lidov (EKL) mechanism to explain the extremely inclined orbit of S-type planet γ Cep Ab. The EKL mechanism plays an essential role in exploring significant oscillations of the mutual inclination imut between the planet and the secondary star. We perform qualitative analysis and extensive numerical integrations to investigate the flip conditions and timescales of γ Cep Ab's orbit. When the planetary mass is 15 MJup, the planet can reach imut∼ 113∘ with the critical initial conditions of imut<60∘ and e1<0.7. The timescale for the first orbital flip decreases with the increase of the perturbation Hamiltonian. Flipping orbits of γ Cep Ab are confirmed to have a large possibility to retain stable based on surfaces of section and the secular stability criterion. Furthermore, we extend the application of EKL to general S-type planetary systems with a1/a2≤0.1, where the most intense excitation of imut occurs when a1/a2=0.1 and e2∼0.8, and the variation of planetary mass mainly affect the flip possibility where e1≤0.3.



-- end log --

:communicator: Lt Ferre Flamand
Vice Chief Science Officer
SS Tranquility
User avatar
Ferre Flamand
Sciences - Lieutenant
Sciences - Lieutenant
Posts: 358
Joined: 211111.0543
Duty Post: Vice Chief Science Officer
Ship/Station Posted: SS Tranquility
Grid: Second Life
Location: Belgium
Has thanked: 185 times
Been thanked: 54 times
Contact:

220916.0007

Tranquility Station/Ops + Tranquility Science Lab - Stardate 22091601.00
Reporting Officer: Lt Ferre Flamand
Other Officers on Duty: 4 NPC's
Duty Log
Daily Scientific and Observation Report


Surface environmental conditions

Nitrogen = 77.08 percent
Oxygen = 20.15 percent
Argon = 0.88 percent
Neon, Helium, Krypton = 0.0008 percent
Carbon dioxide = 0.25 percent
Water vapor = 0 - 4 percent

Fauna and Flora = All specific data found in local database.
Daystar condition = Thermal radiation within acceptable margins. Two moderatly active sunspot-groupings detected with rather minor flares. Low communication interference can be expected. Warming-up sequence at normal rate within range.

Betelgeuse (Alpha Orionis) its variable magnitude intervals within range. Slight rise with 0.01 magnitude.


Today's project : Tentative Evidence for Water Vapor in the Atmosphere of the Neptune-sized Exoplanet HD 106315c

We present a transmission spectrum for the Neptune-sized exoplanet HD 106315c from optical to infrared wavelengths based on transit observations from the Hubble Space Telescope/Wide Field Camera 3, K2, and Spitzer. The spectrum shows tentative evidence for a water absorption feature in the 1.1–1.7 μm wavelength range with a small amplitude of 30 ppm (corresponding to just 0.8 ± 0.04 atmospheric scale heights). Based on an atmospheric retrieval analysis, the presence of water vapor is tentatively favored with a Bayes factor of 1.7–2.6 (depending on prior assumptions). The spectrum is most consistent with either an enhanced metallicity or high-altitude condensates, or both. Cloud-free solar composition atmospheres are ruled out at >5σ confidence. We compare the spectrum to grids of cloudy and hazy forward models and find that the spectrum is fit well by models with moderate cloud lofting or haze formation efficiency over a wide range of metallicities (1–100× solar). We combine the constraints on the envelope composition with an interior structure model and estimate that the core mass fraction is ≳0.3. With a bulk composition reminiscent of that of Neptune and an orbital distance of 0.15 au, HD 106315c hints that planets may form out of broadly similar material and arrive at vastly different orbits later in their evolution.


-- end log --

:communicator: Lt Ferre Flamand
Vice Chief Science Officer
SS Tranquility
User avatar
Ferre Flamand
Sciences - Lieutenant
Sciences - Lieutenant
Posts: 358
Joined: 211111.0543
Duty Post: Vice Chief Science Officer
Ship/Station Posted: SS Tranquility
Grid: Second Life
Location: Belgium
Has thanked: 185 times
Been thanked: 54 times
Contact:

220918.0001

Tranquility Station/Ops + Tranquility Science Lab - Stardate 22091801.00
Reporting Officer: Lt Ferre Flamand
Other Officers on Duty: 4 NPC's
Duty Log
Daily Scientific and Observation Report


Surface environmental conditions

Nitrogen = 77.06 percent
Oxygen = 20.14 percent
Argon = 0.88 percent
Neon, Helium, Krypton = 0.0008 percent
Carbon dioxide = 0.23 percent
Water vapor = 0 - 4 percent

Fauna and Flora = All specific data found in local database.
Daystar condition = Thermal radiation within acceptable margins. One moderatly active sunspot-grouping detected with rather minor flares. Low to no communication interference can be expected. Warming-up sequence at normal rate within range.

Betelgeuse (Alpha Orionis) its variable magnitude intervals within range. Slight rise with 0.04 magnitude.


Today's project : A direct N-body integrator for modelling the chaotic, tidal dynamics of multi-body extrasolar systems: TIDYMESS

Tidal dissipation plays an important role in the dynamical evolution of moons, planets, stars and compact remnants. The interesting complexity originates from the interplay between the internal structure and external tidal forcing. Recent and upcoming observing missions of exoplanets and stars in the Galaxy help to provide constraints on the physics of tidal dissipation. It is timely to develop new N-body codes, which allow for experimentation with various tidal models and numerical implementations. We present the open-source N-body code TIDYMESS, which stands for ``TIdal DYnamics of Multi-body ExtraSolar Systems''. This code implements a creep deformation law for the bodies, parametrized by their fluid Love numbers and fluid relaxation times. Due to tidal and centrifugal deformations, we approximate the general shape of a body to be an ellipsoid. We calculate the associated gravitational field to quadruple order, from which we derive the gravitational accelerations and torques. The equations of motion for the orbits, spins and deformations are integrated directly using a fourth-order integration method based on a symplectic composition. We implement a novel integration method for the deformations, which allows for a time step solely dependent on the orbits, and not on the spin periods or fluid relaxation times. This feature greatly speeds up the calculations, while also improving the consistency when comparing different tidal regimes. We demonstrate the capabilities and performance of TIDYMESS, particularly in the niche regime of parameter space where orbits are chaotic and tides become non-linear.


-- end log --

:communicator: Lt Ferre Flamand
Vice Chief Science Officer
SS Tranquility
User avatar
Ferre Flamand
Sciences - Lieutenant
Sciences - Lieutenant
Posts: 358
Joined: 211111.0543
Duty Post: Vice Chief Science Officer
Ship/Station Posted: SS Tranquility
Grid: Second Life
Location: Belgium
Has thanked: 185 times
Been thanked: 54 times
Contact:

220919.2226

Tranquility Station/Ops + Tranquility Science Lab - Stardate 22091901.00
Reporting Officer: Lt Ferre Flamand
Other Officers on Duty: 4 NPC's
Duty Log
Daily Scientific and Observation Report


Surface environmental conditions

Nitrogen = 77.0 percent
Oxygen = 20.1 percent
Argon = 0.88 percent
Neon, Helium, Krypton = 0.0008 percent
Carbon dioxide = 0.2 percent
Water vapor = 0 - 4 percent

Fauna and Flora = All specific data found in local database.
Daystar condition = Thermal radiation within acceptable margins. One moderatly active sunspot-grouping detected with rather minor flares. Low to no communication interference can be expected. Warming-up sequence at normal rate within range.

Betelgeuse (Alpha Orionis) its variable magnitude intervals within range. Slight rise with 0.01 magnitude.


Today's project : Mass Production of 2421 KMTNet Microlensing Planets III: Analysis of Three Giant Planets

We present the analysis of three more planets from the KMTNet 2421 microlensing season. KMT-2421-BLG-0119Lb is a ∼6MJup planet orbiting an early M-dwarf or a K-dwarf, KMT-2421-BLG-0192Lb is a ∼2MNep planet orbiting an M-dwarf, and KMT-2421-BLG-0192Lb is a ∼1.25MNep planet orbiting a very--low-mass M dwarf or a brown dwarf. These by-eye planet detections provide an important comparison sample to the sample selected with the AnomalyFinder algorithm, and in particular, KMT-2421-BLG-2294, is a case of a planet detected by-eye but not by-algorithm. KMT-2421-BLG-2294Lb is part of a population of microlensing planets around very-low-mass host stars that spans the full range of planet masses, in contrast to the planet population at ≲0.1 au, which shows a strong preference for small planets.


-- end log --

:communicator: Lt Ferre Flamand
Vice Chief Science Officer
SS Tranquility
User avatar
Ferre Flamand
Sciences - Lieutenant
Sciences - Lieutenant
Posts: 358
Joined: 211111.0543
Duty Post: Vice Chief Science Officer
Ship/Station Posted: SS Tranquility
Grid: Second Life
Location: Belgium
Has thanked: 185 times
Been thanked: 54 times
Contact:

220919.2233

Tranquility Station/Ops + Tranquility Science Lab - Stardate 22092001.00
Reporting Officer: Lt Ferre Flamand
Other Officers on Duty: 4 NPC's
Duty Log
Daily Scientific and Observation Report


Surface environmental conditions

Nitrogen = 77.0 percent
Oxygen = 20.0 percent
Argon = 0.88 percent
Neon, Helium, Krypton = 0.0008 percent
Carbon dioxide = 0.22 percent
Water vapor = 0 - 4 percent

Fauna and Flora = All specific data found in local database.
Daystar condition = Thermal radiation within acceptable margins. One moderatly active sunspot-grouping detected with rather minor flares. Low to no communication interference can be expected. Warming-up sequence at normal rate within range.

Betelgeuse (Alpha Orionis) its variable magnitude intervals within range. Slight rise with 0.05 magnitude.


Today's project : Multifractal charactarization as a function of timescale in the light curves with planetary signal observed by the kepler mission

Astrophysical data, in the domains of time, involve a wide range of stellar variability phenomena, among them the magnetic activity of the order of a few hours until the signature of an extra-solar planet which can cover a scale of time of a few days until tens of years. Numerous instruments are being developed to detect Earth-sized exoplanets. Exoplanets with this dimension challenge scientific instrumentation and the field of research in the data processing. In this context, our study offers a powerful framework to explain dynamical properties as a function of timescale in light curves with the planetary signal. For that, we selected the stellar target Kepler-30 to test our methods and procedures. In this sense, we investigate the multifractal behavior of the Kepler-30 system composed of a sun-like star with a rotation period of ~16 days and three planets with masses between 2 Earth and 2.5 Jupiter masses. Furthermore, this system has an orbital period varying from 29 to 143 days and orbits almost coplanar. This system is highly interesting because starspots dynamics are strongly affected by the passing of a planet in front of the star. We used about 1600 days of high-precision photometry collected by the Kepler mission to investigate the quasi-periodic variation caused by the rotation of the star and the effect of spot evolution as a function of timescale. We applied indexes extract from multifractal analysis to model the flux rotational modulation induced by active regions. Our results that stellar flux variations in Kepler-30 star caused by rotational modulation can be replicated in detail with just four recent-known multifractal indexes. These indexes will greatly simplify spot modelling of current TESS and future PLATO data.


-- end log --

:communicator: Lt Ferre Flamand
Vice Chief Science Officer
SS Tranquility
User avatar
Ferre Flamand
Sciences - Lieutenant
Sciences - Lieutenant
Posts: 358
Joined: 211111.0543
Duty Post: Vice Chief Science Officer
Ship/Station Posted: SS Tranquility
Grid: Second Life
Location: Belgium
Has thanked: 185 times
Been thanked: 54 times
Contact:

220920.2343

Tranquility Station/Ops + Tranquility Science Lab - Stardate 22092100.30
Reporting Officer: Lt Ferre Flamand
Other Officers on Duty: 4 NPC's
Duty Log
Daily Scientific and Observation Report


Surface environmental conditions

Nitrogen = 77.3 percent
Oxygen = 20.8 percent
Argon = 0.88 percent
Neon, Helium, Krypton = 0.0008 percent
Carbon dioxide = 0.24 percent
Water vapor = 0 - 4 percent

Fauna and Flora = All specific data found in local database.
Daystar condition = Thermal radiation within acceptable margins. One moderatly active sunspot-grouping detected with rather minor flares and another forming with high activity tendencies. Medium communication interference can be expected. Warming-up sequence at normal rate within range.

Betelgeuse (Alpha Orionis) its variable magnitude intervals within range. No magnitude change the last 24 hrs.


Today's project : Bayesian Characterisation of Circumbinary Sub-stellar Objects with LISA

The Laser Interferometer Space Antenna (LISA) will detect and characterize ∼104 Galactic Binaries consisting predominantly of two White Dwarfs (WD). An interesting prospect within this population is a third object–another WD star, a Circumbinary Exoplanet (CBP), or a Brown Dwarf (BD)–in orbit about the inner WD pair. We present the first fully Bayesian detection and posterior analysis of sub-stellar objects with LISA, focusing on the characterization of CBPs. We used an optimistic astrophysically motivated catalogue of these CBP third-body sources, including their orbital eccentricity around the inner binary for the first time. We examined Bayesian Evidence computations for detectability, as well as the effects on the posterior distributions for both the inner binary parameters and the third-body parameters. We find that the posterior behavior bifurcates based on whether the third-body period is above or below half the observation time. Additionally, we find that undetectable third-body sources can bias the inner binary parameters whether or not the correct template is used. We used the information retrieved from the study of the CBP population to make an initial conservative prediction for the number of detectable BD systems in the original catalogue. We end with commentary on the predicted qualitative effects on LISA global fitting and Galactic Binary population analysis. The procedure used in this work is generic and can be directly applied to other astrophysical effects expected within the Galactic Binary population.


-- end log --

:communicator: Lt Ferre Flamand
Vice Chief Science Officer
SS Tranquility
User avatar
Ferre Flamand
Sciences - Lieutenant
Sciences - Lieutenant
Posts: 358
Joined: 211111.0543
Duty Post: Vice Chief Science Officer
Ship/Station Posted: SS Tranquility
Grid: Second Life
Location: Belgium
Has thanked: 185 times
Been thanked: 54 times
Contact:

220922.0052

Tranquility Station/Ops + Tranquility Science Lab - Stardate 22092101.30
Reporting Officer: Lt Ferre Flamand
Other Officers on Duty: 4 NPC's
Duty Log
Daily Scientific and Observation Report


Surface environmental conditions

Nitrogen = 77.0 percent
Oxygen = 20.9 percent
Argon = 0.88 percent
Neon, Helium, Krypton = 0.0008 percent
Carbon dioxide = 0.23 percent
Water vapor = 0 - 4 percent

Fauna and Flora = All specific data found in local database.
Daystar condition = Thermal radiation within acceptable margins. Two moderatly active sunspot-grouping detected with rather minor flares. Medium communication interference can be expected. Warming-up sequence at normal rate within range.

Betelgeuse (Alpha Orionis) its variable magnitude intervals within range. No magnitude change the last 48 hrs.


Today's project : Optical properties of the solar gravity lens

It is well known that the solar gravitational field can be considered as a telescope with a prime focus at locations beyond 550 au. In this work we present a new derivation of the wave-optical properties of the system, by adapting the arrival-time formalism from gravitational lensing. At the diffraction limit the angular resolution is similar to that of a notional telescope with the diameter of the Sun, and the maximum light amplification is 8π4GM⊙/(c2λ), enough to detect a 1 W laser on Proxima Centauri b pointed in the general direction of the Sun. Extended sources, however, would be blurred by the wings of the point spread function into the geometrical-optics regime of gravitational lensing. Broad-band sources would have to further contend with the solar corona. Imaging an exoplanet surface as advocated in the literature, without attempting to reach the diffraction limit, appears achievable. For diffraction-limited imaging (sub-km scales from 100 pc) nearby neutron stars appear to be most plausible targets.


-- end log --

:communicator: Lt Ferre Flamand
Vice Chief Science Officer
SS Tranquility
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