Exodus from Osiris: Quantifying the Mass Escape from HD 209458 b.
Abstract
Hot Jupiters represent a class of exoplanet orbiting very close to their parent star and are expected to exhibit large mass escape rates (up to ~1010 - 1011 g/s) due to the intense stellar EUV/UV heating. We examine the differences between mass escape rates predicted by both a one-dimensional (1-D) and a three-dimensional non-hydrostatic whole atmosphere model for the exoplanet HD 209458 b (Osiris). In particular, we examine the role of ion-neutral coupling and magnetic fields on the mass escape rates from the upper atmosphere and investigate the role of Lyman-alpha cooling in regulating the thermosphere-ionosphere temperatures. We find that the 3-D circulation has an important impact on the estimated escape rates of mass from these planets and the presence of a magnetic field significantly modifies the energy balance in these atmospheres.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.P22B..06B
- Keywords:
-
- 5210 Planetary atmospheres;
- clouds;
- and hazes;
- PLANETARY SCIENCES: ASTROBIOLOGY;
- 6207 Comparative planetology;
- PLANETARY SCIENCES: SOLAR SYSTEM OBJECTS;
- 6296 Extra-solar planets;
- PLANETARY SCIENCES: SOLAR SYSTEM OBJECTS;
- 5405 Atmospheres;
- PLANETARY SCIENCES: SOLID SURFACE PLANETS