Affiliation
Department of Planetary Sciences, The University of ArizonaIssue Date
2021Keywords
Planets and satellites: compositionPlanets and satellites: fundamental parameters
Planets and satellites: interiors
Planets and satellites: terrestrial planets
Metadata
Show full item recordPublisher
EDP SciencesCitation
Lozovsky, M., Helled, R., Pascucci, I., Dorn, C., Venturini, J., & Feldmann, R. (2021). Why do more massive stars host larger planets? Astronomy and Astrophysics, 652.Journal
Astronomy and AstrophysicsRights
Copyright © M. Lozovsky et al. 2021.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Aims. It has been suggested that planetary radii increase with stellar mass for planet sizes smaller than 6 R and host masses lower than 1 M·. In this study, we explore whether this inferred relation of planetary size and host star mass can be explained by a higher planetary mass of planets orbiting higher-mass stars, inflation of the planetary radius due to the difference in stellar irradiation, or different planetary compositions and structures. Methods. Using exoplanetary data of planets with measured masses and radii, we investigated the relations between stellar mass and various planetary properties for G and K stars. We confirm that more massive stars host larger and more massive planets. Results. We find that the differences in the planetary masses and temperatures are insufficient to explain the measured differences in radii for planets surrounding different stellar types. We show that the larger planetary radii can be explained by a larger fraction of volatile material (H-He atmospheres) in planets surrounding more massive stars. Conclusions. We conclude that planets around more massive stars are most probably larger as a result of larger H-He atmospheres. Our findings imply that planets forming around more massive stars tend to accrete H-He atmospheres more efficiently. © 2021 M. Lozovsky et al.Note
Immediate accessISSN
0004-6361Version
Final published versionae974a485f413a2113503eed53cd6c53
10.1051/0004-6361/202140563