3I/ATLAS is an interstellar object whose activity provides critical insights into its composition and origin. However, due to its orbital geometry, the object is too close to the Sun near […]
astro-ph.EP
Posted inExoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, Stellar Cartography
Observational Signatures of Planetary Tidal Disruption Events Around Solar-Mass Stars
The tidal disruption of planets by their host stars represents a growing area of interest in transient astronomy, offering insights into the final stages of planetary system evolution.
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Hot And cloudy: High Temperature Clouds In Super-Earths And Sub-Neptunes
JWST observations provide for the first time evidence for an atmosphere on a rocky exoplanet – 55 Cnc e. The atmosphere of 55 Cnc e is hot with Teq>2000K and […]
Posted inAstrogeology, Exoplanets, -moons, -comets, Lava / magma ocean / Volcanic Worlds, Status Report
Magma Ocean Waves And Thermal Variability On Lava Worlds
Lava worlds are rocky planets with dayside skins made molten by stellar irradiation. Tidal heating on these shortest-period planets is more than skin deep.
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Exoplanet Transit Search At The Detection Limit: Detection And False Alarm Vetting Pipeline
One of the primary mission goals of the Kepler space telescope was to detect Earth-like terrestrial planets in the habitable zone around Sun-like stars. These planets are at the detection […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, TRAPPIST-1
Overestimated Pressure Broadening Misleads Model Spectra in Cool M Dwarf Stars
Available one-dimensional stellar models fail to reproduce the observed spectrum of the ultracool M dwarf TRAPPIST-1.
Posted inBeta Pictoris, Comets and Asteroids, Exoplanets, -moons, -comets, Icy Worlds, Imaging & Spectroscopy, Status Report
Transit Distances And Composition Of Low-velocity Exocomets In The β Pictoris System
β Pictoris is a young nearby A5V star, about 20 Myr old, embedded in a prominent debris disc. For the past 40 years, variable absorption features have been observed in […]
Posted inAstrochemistry, Astrogeology, Astronomy & Telescopes, Biosignatures & Paleobiology, Comets and Asteroids, Imaging & Spectroscopy, Interstellar, Status Report
SPHEREx Re-Observation of Interstellar Object 3I/ATLAS in December 2025: Detection of Increased Post-Perihelion Activity, Refractory Coma Dust, and New Coma Gas Species
In December-2025, the NASA SPHEREx spacecraft re-observed ISO 3I/ATLAS post-perihelion, finding a much more active object compared to August-2025 SPHEREx pre-perihelion observations, with marked evidence for development into an cometary […]
Posted inComets and Asteroids, Exoplanets, -moons, -comets, Nomenclature, Systematics, Natural History, Status Report, Stellar Cartography
A Nomenclature For Individual Exocomets
With recent observational advancements, exocomet studies have entered a new era: we have moved from an epoch where exocomets’ signatures were analysed to identify their true nature to a new […]
Posted inAstrogeology, Exoplanets, -moons, -comets, Status Report
Toward Reliable Interpretations of Small Exoplanet Compositions: Comparisons and Considerations of Equations of State and Materials Used in Common Rocky Planet Models
The bulk compositions of small planets (Rp<2R⊕) are directly linked to their formation histories, making reliable compositional constraints imperative for testing models of planet formation and evolution.