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In Situ Formation and Dynamical Evolution of Hot Jupiter Systems

Batygin, Konstantin and Bodenheimer, Peter H. and Laughlin, Gregory P. (2016) In Situ Formation and Dynamical Evolution of Hot Jupiter Systems. Astrophysical Journal, 829 (2). Art. No. 114. ISSN 0004-637X.

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Hot Jupiters, giant extrasolar planets with orbital periods shorter than ~10 days, have long been thought to form at large radial distances, only to subsequently experience long-range inward migration. Here, we offer the contrasting view that a substantial fraction of the hot Jupiter population formed in situ via the core-accretion process. We show that under conditions appropriate to the inner regions of protoplanetary disks, rapid gas accretion can be initiated by super-Earth-type planets, comprising 10–20 Earth masses of refractory material. An in situ formation scenario leads to testable consequences, including the expectation that hot Jupiters should frequently be accompanied by additional low-mass planets with periods shorter than ~100 days. Our calculations further demonstrate that dynamical interactions during the early stages of planetary systems' lifetimes should increase the inclinations of such companions, rendering transits rare. High-precision radial velocity monitoring provides the best prospect for their detection.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Batygin, Konstantin0000-0002-7094-7908
Laughlin, Gregory P.0000-0002-3253-2621
Additional Information:© 2016. The American Astronomical Society. Received 2015 November 29; revised 2016 July 1; accepted 2016 July 20; published 2016 September 28. We are thankful to Dave Stevenson, Chris Spalding, Mike Brown, and Heather Knutson for inspirational conversations, as well as to Eugene Chiang for providing a thorough review of the paper, which led to a substantial improvement of the manuscript.
Subject Keywords:planets and satellites: dynamical evolution and stability – planets and satellites: formation
Issue or Number:2
Record Number:CaltechAUTHORS:20160819-091429487
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Official Citation:Konstantin Batygin et al 2016 ApJ 829 114
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69778
Deposited By: Tony Diaz
Deposited On:22 Aug 2016 21:48
Last Modified:09 Mar 2020 13:18

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