"QUOTE_UNAVAILABLE: Full article text required to extract exact, detailed quotes of 60–85 words each. Please provide the article text or a link with open access so quotes can be extracted accurately."
A super-hot planet in a very close orbit maintains a thick atmosphere despite intense stellar radiation that typically drives rapid atmospheric escape. Observations reveal strong atmospheric signatures indicating a substantial gas envelope and longer-than-expected retention timescales. Potential mechanisms that reduce mass loss include deep gravitational potential, atmospheres dominated by high mean molecular weight gases, magnetic shielding from stellar wind, efficient radiative cooling of the upper atmosphere, and ongoing replenishment via interior outgassing. High-altitude clouds or ionized metals can alter observational diagnostics and slow escape. The persistence of the atmosphere necessitates updates to mass-loss models and affects interpretations of planetary composition and evolution.
Read at Nature
Unable to calculate read time
Collection
[
|
...
]