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The Hot Jupiter Period–Mass Distribution as a Signature of in situ Formation

Bailey, Elizabeth and Batygin, Konstantin (2018) The Hot Jupiter Period–Mass Distribution as a Signature of in situ Formation. Astrophysical Journal Letters, 866 (1). Art. No. L2. ISSN 2041-8213. doi:10.3847/2041-8213/aade90.

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More than two decades after the widespread detection of Jovian-class planets on short-period orbits around other stars, their dynamical origins remain imperfectly understood. In the traditional narrative, these highly irradiated giant planets, like Jupiter and Saturn, are envisioned to have formed at large stello-centric distances and to have subsequently undergone large-scale orbital decay. Conversely, more recent models propose that a large fraction of hot Jupiters could have formed via rapid gas accretion in their current orbital neighborhood. In this study, we examine the period–mass distribution of close-in giant planets, and demonstrate that the inner boundary of this population conforms to the expectations of the in situ formation scenario. Specifically, we show that if conglomeration unfolds close to the disk's inner edge, the semimajor axis–mass relation of the emergent planets should follow a power law a ∝ M^(−2/7)—a trend clearly reflected in the data. We further discuss corrections to this relationship due to tidal decay of planetary orbits. Although our findings do not discount orbital migration as an active physical process, they suggest that the characteristic range of orbital migration experienced by giant planets is limited.

Item Type:Article
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URLURL TypeDescription Paper
Bailey, Elizabeth0000-0002-4769-8253
Batygin, Konstantin0000-0002-7094-7908
Additional Information:© 2018 The American Astronomical Society. Received 2018 August 8; revised 2018 August 27; accepted 2018 September 2; published 2018 October 5. We wish to thank Dan Fabrycky, Greg Laughlin, Eugene Chiang, and Matt Holman for useful conversations, and the anonymous reviewer for useful comments. This research has utilized the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program.
Group:Astronomy Department
Funding AgencyGrant Number
Subject Keywords:planetary systems
Issue or Number:1
Record Number:CaltechAUTHORS:20181017-153724538
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Official Citation:Elizabeth Bailey and Konstantin Batygin 2018 ApJL 866 L2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90312
Deposited By: Tony Diaz
Deposited On:18 Oct 2018 16:40
Last Modified:16 Nov 2021 03:31

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