July 2023 – Page 12 – My WordPress Site

Astrochemistry, Astrogeology, Comets and Asteroids, Meteorites & Asteroids

Thermochemical Stability of Low-Iron, Manganese-Enriched Olivine in Astrophysical Environments

by Keith CowingJuly 5, 2023December 2, 2023

Empirical, non-parametric radius distribution of planets hosted by late K- and early M-type dwarfs observed by Kepler and assigned ages based on rotation, corrected for detection efficiency. The black line is the total distribution (113 planets), while the red and blue lines are the distributions for the halves of the sample with rotation-based ages younger and older than the median age of 3.86 Gyr, respectively. Shaded regions denote 68% confidence interval determined from Monte Carlo sampling with replacement. The vertical magenta lines mark the location (and uncertainty) of the radius valley using Eqn. 11 in Ho & Van Eylen (2023) for the sample’s median mass of 0.59 M⊙ and median period of 7.1 days. -- astro-ph.EP

Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biophysics, Biosignatures & Paleobiology, Genomics, Proteomics, Bioinformatics, Origin & Evolution of Life

Serpentinization-Associated Mineral Catalysis of the Protometabolic Formose System

by Keith CowingJuly 4, 2023July 4, 2023

Astronomy & Telescopes, Biosignatures & Paleobiology, Imaging & Spectroscopy, SETI & Technosignatures

A VERITAS/Breakthrough Listen Search for Optical Technosignatures

by Keith CowingJuly 3, 2023July 3, 2023

Solid lines plot the outer planet inclination evolution relative to the binary orbital plane determined by rebound simulations with different binary mass ratios. The outer planet orbit is initially coplanar with the binary orbital plane. The binary mass ratios are: 𝑞b = 1 (blue, Model C1), 0.5 (green, Model D1), 0.1 (orange, Model D2), and 0.01 (red, Model D3). For each case, the value of the initial semi-major axis is 𝑎4 = 𝑎m = 0.616𝑎o given by Equation (25). The horizontal dashed line is the predicted maximum inclination given by Equation (20) that has the same value for all these cases. -- astro-ph.EP

Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Habitable Zones, Imaging & Spectroscopy, Venus

Stability Of Nucleic Acid Bases In Concentrated Sulfuric Acid: Implications For The Habitability Of Venus’ Clouds

by Keith CowingJuly 3, 2023July 3, 2023

Astrochemistry, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Imaging & Spectroscopy

Deep Search For Glycine Conformers In Barnard 5

by Keith CowingJuly 3, 2023July 3, 2023

GeneLab -- NASA

AI - Data - Apps - Cybernetics, Away Teams & Field Reports, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Exploration Gear & Tech, Habitable Zones, Imaging & Spectroscopy, Missions & Hardware, Proxima Centauri

Away Team Tech: Proxima Centauri Interstellar Flyby Scientific Data Downlink Design

by Keith CowingJuly 1, 2023July 1, 2023

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

X-ray Photodesorption Of Complex Organic Molecules In Protoplanetary Disks — I. Acetonitrile CH3CN

by Keith CowingJuly 1, 2023

Schematic diagram of our preferred scenario. Red circles are planetesimals (and their fragments) from the terrestrial planet region. The black solid curves roughly denote the boundary of the current asteroid inner main belt. Eccentricity increases from bottom to top. Each panel shows the proposed evolution of the inner Solar System at different time ranges: (A) Formation and cooling of the EL planetesimal in the terrestrial planet region before 60 Myr after Solar System formation. In this period, the terrestrial planets began scattering planetesimals to orbits with high eccentricity and semimajor axes that correspond to the asteroid main belt. (B) Between 60 and 100 Myr, the EL planetesimal was destroyed by an impact in the terrestrial planet region. At least one fragment (the Athor family progenitor) was scattered by the terrestrial planets into the scattered disk, as in (A), then the giant planet instability implanted it into the inner main belt by decreasing its eccentricity. (C) A few tens of millions of years after the giant planet instability occurred, a giant impact between the planetary embryo Theia and proto-Earth formed the Moon. (D) The Athor family progenitor experienced another impact event that formed the Athor family at ~1500 Myr. -- Science

Astrochemistry, Astrogeology, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Comets and Asteroids, Imaging & Spectroscopy, Meteorites & Asteroids, Missions & Hardware

Complex Organosulfur Molecules On Comet 67P: Evidence From The ROSINA Measurements And Insights From Laboratory Simulations

by Keith CowingJuly 1, 2023July 1, 2023