September 2025 – Page 24 – My WordPress Site

The distribution of accretion parameters relative to steady state derived from the posteriors of the MCMC tests, separated based on the dominant atmospheric species.

Astronomy & Telescopes, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Icy Worlds, Imaging & Spectroscopy, Stellar Cartography

Do White Dwarfs Sample Water-Rich Planetary Material?

by Keith CowingSeptember 2, 2025September 2, 2025

3D hydrodynamic simulation of atmospheric escape from Ref. 8, for a system similar to HAT-P-67 b. Figure 2a shows the gas density. The star is in the center of the plot and the observer is looking from the left. -- astro-ph.IM

Astronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Imaging & Spectroscopy

VIPER: A High-resolution Multimode Fiber-fed VIPA Spectrograph Concept For Characterizing Exoplanet Atmospheric Escape

by Keith CowingSeptember 2, 2025September 2, 2025

NASA ID: PIA26633 larger image

Astrogeology, Fossils & Paleontology, Imaging & Spectroscopy, Mars, Missions & Hardware, Robotics/Rovers/UAVs

Curiosity Rover ChemCam Views A Rock Shaped By Eons of Wind And Water

by Keith CowingSeptember 1, 2025September 1, 2025

NASA ID: iss073e0545092 iss073e0545092 (Aug. 26, 2025) -- larger image

Astronauts and Explorers, People Of Astrobiology, Space Life Science, Space Stations

Offworld Biology: Astronaut Zena Cardman Prepares Liver Tissue Research

by Keith CowingSeptember 1, 2025September 18, 2025

Wright Valley and Labyrinth in the Transantarctic Mountains. Credit: NASA/Michael Studinger. Original image

Analog Studies, Arctic / Antarctic / Alpine, Away Teams & Field Reports, Biophysics, Biosignatures & Paleobiology, Cryobiology, Microbiology & Virology, Planetary Protection & Biosafety, Sample Return

Characterizing Microbial Communities in >7000- and >180,000-Year-Old Antarctic Permafrost Using a Low-Biomass Decontamination Protocol

by Keith CowingSeptember 1, 2025September 1, 2025

The structures and relative zero-point-corrected energies (in kJ/mol and kT-equivalent temperature) of the four most stable conformers of 3-hydroxypropanal. The dipole moments are listed as µa/µb/µc. The point group of each conformer is also shown. See text for computational details. The red spheres denote oxygen atoms, the grey spheres are carbon atoms, and the white spheres depict hydrogen atoms. -- astro-ph.GA

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Imaging & Spectroscopy, Interstellar

Rotational Spectroscopy And Tentative Interstellar Detection of 3-Hydroxypropanal (HOCH2CH2CHO)in the G+0.693-0.027 Molecular Cloud

by Keith CowingSeptember 1, 2025September 1, 2025

Envelope composition in the H–He–C–N–O–Si chemical system of TOI-421b (𝑅MEB = 1.65𝑅⊕, 𝑅𝑃 = 2.64𝑅⊕, 𝑀𝑃 = 6.7𝑀⊕, 𝑇MEB = 3000 K) as a function of H mass fraction. Elemental budgets, reactions, gas solubility laws, and real gas equations are described in Sect. 2. MEB partial pressures of the considered gases for (a) 1× solar metallicity and 100% mantle melt (IW–6.2 to IW–5.7), (b) 100× solar metallicity and 100% mantle melt (IW–5.5 to IW–5.2), (c) 1× solar metallicity and 1% mantle melt (IW–3.4 to IW–3.1), and (d) 100× solar metallicity and 1% mantle melt (IW–2.3 to IW–1.6). Full range of MEB partial pressures is shown in Fig. A2. The corresponding partitioning of volatile elements in magma and real gas fugacity coefficients are given in Fig. B1 and Fig. B2, respectively. -- astro-ph.EP

Astrogeology, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Imaging & Spectroscopy, Lava / magma ocean / Volcanic Worlds

Silane-Methane Competition in Sub-Neptune Atmospheres As A Diagnostic Of Metallicity And Magma Oceans

by Keith CowingSeptember 1, 2025September 1, 2025