Prépublication
· 2026 arXiv
EN
A hypothetical origin as lunar ejecta for Earth's quasi-satellites (QS) has gained initial support in recent years, but there is scarce photometric and/or spectroscopic data to support the premise due to the rare observational windows to obtain such data for t...
Grigori Fedorets, Zuri Gray et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Amino acid enantiomeric excess (EE) is a potential biosignature, but its measurement requires sufficient surviving material as well as preserved chirality. We derive a criterion that separates abundance-limited from racemization-limited preservation and apply...
Dimitra Atri
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Close-in sub-Neptunes are born in mean-motion resonant chains that break apart on a timescale of $\sim$100 Myr. If the chains are first ''rattled'' --- have their free eccentricities excited to a few percent --- then breaking occurs on the required timescale....
Mohammad Farhat, Eugene Chiang
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
To search for very wide-orbit binary-lens events, we cross-match microlensing events detected by OGLE-IV and KMTNet between 2011 and 2024. After removing contaminants from variable stars, we identify OGLE-2016-BLG-0523 as a microlensing event showing two short...
Hongjing Yang, Weicheng Zang et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Planet interior models have revealed that warm Jupiters should harbor large heavy element masses (up to 30-40% of the planetary mass). Within the pebble drift and evaporation scenario, inward drifting pebbles can evaporate and enrich the inner disc with vapor...
Bertram Bitsch
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
The PLATO mission, planned to launch in spring 2027, will observe a fixed Southern field, LOPS2, for at least 2 years with the goal of discovering and deriving precise parameters for planets as small as Earth around FGK dwarfs and sub-giants. Afterwards, PLATO...
Yoshi Nike Emilia Eschen, Michelle Kunimoto et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Resolving the ambiguity surrounding current Venusian volcanism is a primary objective for upcoming missions like EnVision and VERITAS. This study uses the Venus Planetary Climate Model to simulate the dispersal and detectability of volcanic plumes containing w...
Maureen Cohen, James Holmes et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Tidally-locked planets express a range of climate regimes distinct from those found in our solar system. Their atmospheres are often dominated by planetary-wide overturning circulations and super- rotating jets. In this paper we explore the hydrological cycle...
Daniel A. Williams, Geoffrey K. Vallis et al.
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Prépublication
· 2026 arXiv
EN
Saturn's icy moon Enceladus is a prime target in the search for life beyond Earth. Abundant H2 and CH4 in Enceladus's south-polar plume have been shown to be consistent with hydrogenotrophic methanogens feeding on products of long-lived serpentinization. Howev...
Sam Nasreldine, Antonin Affholder et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
We apply a two-layer thermophysical model, with water sublimating from below a dust-crust with dynamically varying depth, to simulate the water outgassing rate, dust-ejections, and non-gravitational forces and torques of comet 67P/Churyumov-Gerasimenko. The du...
Nicholas Attree, Yuri Skorov et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
This study aims to determine asteroid rotation periods from sparse, unevenly sampled, multi-observatory photometry using the Lomb-Scargle (L-S) method. The photometric measurements of the asteroids are taken from the circulars of the Minor Planet Center (MPC)....
Kristers Nagainis, Ilgmars Eglitis
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Prépublication
· 2026 arXiv
EN
Space missions such as CoRoT, Kepler, and TESS have transformed asteroseismology and its synergies with exoplanet science. We revisit the nearby K-dwarf HD 219134 to investigate the tension between asteroseismic and interferometric radii, update its fundamenta...
Jérôme Bétrisey, Camilla Pezzotti et al.
#astro-ph.EP