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Size Evolution and Orbital Architecture of KEPLER Small Planets through Giant Impacts and Photoevaporation

Published online by Cambridge University Press:  16 August 2023

Gu Pin-Gao Open the ORCID record for Gu Pin-Gao [Opens in a new window] ,
Matsumoto Yuji ,
Kokubo Eiichiro  and
Kurosaki Kenji
Gu Pin-Gao
Affiliation:
Institute of Astronomy and Astrophysics, Academia Sinica, Taipei 10617, Taiwan
Matsumoto Yuji
Affiliation:
National Astronomical Observatory of Japan, 2-21-1, Osawa, Mitaka, 181-8588 Tokyo, Japan
Kokubo Eiichiro
Affiliation:
National Astronomical Observatory of Japan, 2-21-1, Osawa, Mitaka, 181-8588 Tokyo, Japan
Kurosaki Kenji
Affiliation:
3Department of Planetology, Kobe University, Nada-ku, Kobe, Hyogo, 657-8501, Japan
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Abstract

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The KEPLER transit survey with follow-up spectroscopic observations has discovered numerous small planets (super-Earths/sub-Neptunes) and revealed intriguing features of their sizes, orbital periods, and their relations between adjacent planets. The planet size distribution exhibits a bimodal distribution separated by a radius gap at around 1.8 Earth radii. Besides, these small planets within multiple planetary systems show that adjacent planets are similar in size and their period ratios of adjacent planet pairs are similar as well, a phenomenon often dubbed as peas-in-a-pod in the exoplanet community. While the radius gap has been predicted and theorized for years, whether it can be relevant to the orbital architecture peas-in-a-pod is physically unknown. For the first time, we attempted to model both features together through planet formation and evolution processes involving giant impacts and photoevaporation. We showed that our model is generally consistent with the KEPLER results but with a smaller radius gap. The impact of Kubyshikina’s model for photoevaporation on our model is discussed.

Keywords

Exoplanet formationExoplanet atmospheres
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S370: Winds of Stars and Exoplanets , August 2021 , pp. 251 - 256
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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