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19922026
Showing 2025 · astro-ph.EPShow all

9 papers · 2 filters

astro-ph.EP2025★ 6 cited

Horizontal and vertical exoplanet thermal structure from a JWST spectroscopic eclipse map

Ryan C. Challener, Megan Weiner Mansfield, Patricio E. Cubillos +33

Highly-irradiated giant exoplanets known as "ultra-hot Jupiters" are anticipated to exhibit large variations of atmospheric temperature and chemistry as a function of longitude, la…

astro-ph.EP2025★ 5 cited

The SPACE Program. I. The featureless spectrum of HD 86226 c challenges sub-Neptune atmosphere trends

K. Angelique Kahle, Jasmina Blecic, Reza Ashtari +26

Sub-Neptune exoplanets are the most abundant type of planet known today. As they do not have a Solar System counterpart, many open questions exist about their composition and forma…

astro-ph.EP2025★ 8 cited

NSF-DOE Vera C. Rubin Observatory Observations of Interstellar Comet 3I/ATLAS (C/2025 N1)

Colin Orion Chandler, Pedro H. Bernardinelli, Mario Jurić +305

We report on the observation and measurement of astrometry, photometry, morphology, and activityof the interstellar object 3I/ATLAS, also designated C/2025 N1 (ATLAS) with the NSF-…

astro-ph.EP2025★ 5 cited

The star HIP 41378 potentially misaligned with its cohort of long-period planets

S. Grouffal, A. Santerne, V. Bourrier +29

The obliquity between the stellar spin axis and the planetary orbit, detected via the Rossiter-McLaughlin (RM) effect, is a tracer of the formation history of planetary systems. Wh…

astro-ph.EP2025★ 7 cited

A High Geometric Albedo for LTT9779b Points Towards a Metal-rich Atmosphere and Silicate Clouds

Suman Saha, James S. Jenkins, Vivien Parmentier +7

Aims: In this work, we aim to confirm the high albedo of the benchmark ultrahot Neptune LTT9779b using 20 secondary eclipse measurements of the planet observed with CHEOPS. In addi…

astro-ph.EP2025★ 8 cited

Low 4.5 μm Dayside Emission Disfavors a Dark Bare-Rock scenario for the Hot Super-Earth TOI-431 b

Christopher Monaghan, Pierre-Alexis Roy, Björn Benneke +13

The full range of conditions under which rocky planets can host atmospheres remains poorly understood, especially in the regime of close-in orbits around late-type stars. One way t…