Evolution of helium absorption in escaping atmospheres of gas giants orbiting K stars
Published on:
2 November 2023
Primary Category:
Earth and Planetary Astrophysics
Paper Authors:
Andrew P. Allan,
Aline A. Vidotto,
Carolina Villarreal D'Angelo,
Leonardo A. Dos Santos,
Florian A. Driessen
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Key Details
Atmospheric escape weakens over time for gas giants orbiting K dwarfs
Largest helium 1083nm absorption occurs at youngest ages
Absorption up to 4-7% predicted for planets <150 Myr old
Heating dominated by H photoionization, also non-negligible He heating
Helium energetics and abundance affect observability
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AI generated summary
Evolution of helium absorption in escaping atmospheres of gas giants orbiting K stars
This paper models the long-term evolution of atmospheric escape and resulting helium triplet absorption at 1083nm for gas giant exoplanets orbiting K dwarf stars. It finds the helium signature weakens over time due to declining stellar irradiation and increasing planetary gravity. The models predict the largest helium absorption occurs at young ages, with 4-7% absorption possible for planets <150 Myr old.
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