Planets and satellites: interiors; Planets and satellites:; composition; Planets and satellites: atmospheres; Planets and; satellites: individual: K2-138; Stars: activity.
Abstract :
[en] The modelling of the internal structures of super-Earths and sub-Neptunes gives a valuable insight into their formation history and possible atmospheres. We present a planet model where the interior is coupled with the atmosphere within a Bayesian retrieval scheme. We take into account water in all its possible phases, including steam and supercritical phases, which is necessary for systems with a wide range of stellar irradiations. Our interior-atmosphere model calculates the compositional and atmospheric parameters, such as Fe and water content, surface pressures, scale heights and albedos. We analyse the multiplanetary systems K2-138 and TRAPPIST-1. From their individual composition, we derive a global increasing trend on the water content with increasing distance from the star in the inner region of the systems, while the planets in the outer region present a constant water mass fraction. This trend reveals the possible effects of migration, formation location and atmospheric mass loss during their formation history.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Acuña, L.
Lopez, T.
Deleuil, M.
Mousis, O.
Marcq, E.
Morel, Thierry ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Santerne, A.
Language :
English
Title :
Characterising the interior structures and atmospheres of multiplanetary systems
Publication date :
01 December 2021
Event name :
SF2A-2021
Event date :
7 au 11 juin 2021
By request :
Yes
Main work title :
Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics
Publisher :
Eds.: A. Siebert, K. Baillié, E. Lagadec, N. Lagarde, J. Malzac, J.-B. Marquette, M. N'Diaye, J. Richard, O. Venot