EUV-driven mass-loss of protoplanetary cores with hydrogen-dominated atmospheres: the influences of ionization and orbital distance

Autor(en)

N V Erkaev, Helmut Lammer, P Odert, K. G Kislyakova, Colin Johnstone, Manuel Güdel, Maxim L. Khodachenko

Abstrakt

We investigate the loss rates of the hydrogen atmospheres of terrestrial planets with a range of masses and orbital distances by assuming a stellar extreme ultraviolet (EUV) luminosity that is 100 times stronger than that of the current Sun. We apply a 1D upper atmosphere radiation absorption and hydrodynamic escape model that takes into account ionization, dissociation and recombination to calculate hydrogen mass-loss rates. We study the effects of the ionization, dissociation and recombination on the thermal mass-loss rates of hydrogen-dominated super-Earths and compare the results to those obtained by the energy-limited escape formula which is widely used for mass-loss evolution studies. Our results indicate that the energy-limited formula can to a great extent over- or underestimate the hydrogen mass-loss rates by amounts that depend on the stellar EUV flux and planetary parameters such as mass, size, effective temperature and EUV absorption radius.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Russian Academy of Sciences, Österreichische Akademie der Wissenschaften (ÖAW), Karl-Franzens-Universität Graz, N. I. Lobachevsky State University of Nizhny Novgorod, University of Texas, Austin

Journal

Monthly Notices of the Royal Astronomical Society

Band

460

Seiten

1300 - 1309

Anzahl der Seiten

10

ISSN

0035-8711

DOI

https://doi.org/10.1093/mnras/stw935

Publikationsdatum

08-2016

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

Schlagwörter

ASJC Scopus Sachgebiete

Astronomy and Astrophysics, Space and Planetary Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/83aacdbf-82cd-4c57-8523-94d39291ad5c