photoevaporation Archives

Contrast curves around TOI-1347 from Gemini/‘Alopeke; the inset shows the reconstructed image at 832 nm. No companions are detected. -- astro-ph.EP

Astronomy & Telescopes, Atmospheres, Climate, Weather, Imaging & Spectroscopy, Status Report

The TESS-Keck Survey. XII. A Dense 1.8 R⊕ Ultra-Short-Period Planet Possibly Clinging to a High-Mean-Molecular-Weight Atmosphere After the First Gyr

by Keith CowingFebruary 13, 2024February 13, 2024

The extreme environments of ultra-short-period planets (USPs) make excellent laboratories to study how exoplanets obtain, lose, retain, and/or regain gaseous atmospheres.

Envelope fraction lost due to stellar wind (upper left) and photoevaporation (lower left ) as a function of parameters associated with each respective model. EUV flux was calculated at 5 Gyr and at planetary orbit. The size of the scatter points is a function of the radius of the planet. Histograms of envelope fraction lost due to stellar wind (upper right) and photoevaporation (lower right). The fraction of envelope lost for planets located below 0.1 AU is indicated in blue and above 0.1 AU, in green, with their respective median values. -- astro-ph.EP

Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Habitable Zones, Space Weather & Heliophysics, Status Report

Impact of M-dwarf Stellar Wind and Photoevaporation on the Atmospheric Evolution of Small Planets

by Keith CowingSeptember 21, 2023September 21, 2023

The evolution of a planet’s atmosphere depends strongly on its host star’s properties. When their host stars are younger, planets can experience stronger winds and EUV emissions. This is particularly […]