English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Proceedings

Young planets under extreme UV irradiation: Upper atmosphere modelling of the young exoplanet K2-33b

MPS-Authors

Kubyshkina,  Daria
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lendl,  Monika
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fossati,  Luca
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cubillos,  Patricio
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lammer,  Helmut
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Erkaev,  Nikolay
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Johnstone,  Colin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Kubyshkina, D., Lendl, M., Fossati, L., Cubillos, P., Lammer, H., Erkaev, N., et al. (2018). Young planets under extreme UV irradiation: Upper atmosphere modelling of the young exoplanet K2-33b.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CCB0-E
Abstract
The K2-33 b is a planet of 5 Earth radii orbiting the young M-type host star, recently emerged from the interplanetary disc. The extreme youth of the system (<20 Myr) gives the unprecedented opportunity to study the earliest phases of planetary evolution, at a stage when the planet is exposed to an extremely high level of high-energy radiation emitted by the host star. Since the planetary mass remains unknown (the estimated upper limit is 5.4 Jupiter mass), we perform a series of 1D hydrodynamic simulations of the planet's upper atmosphere considering a range of most probable possible planetary masses in the range from super-Earth to the twice of Neptune. To account for internal heating as a result of contraction, we set the temperature range from the black body temperature of the planet of 850 K to 1300 K. As the result, we obtain temperature profiles mostly controlled by the planet's mass, while the equilibrium temperature has a secondary effect. For planetary masses below 7-10 Earth mass, the atmosphere is exposed to extremely high escape rates, driven by the planet's weak gravity and high thermal energy, which increase with decreasing mass and/or increasing temperature. For higher masses, the escape is instead driven by the absorption of the high-energy stellar radiation. A rough comparison of the timescales for complete atmospheric escape and age of the system indicates that the planet is more massive than 10 Earth masses.