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Title: Deserts and pile-ups in the distribution of exoplanets due to photoevaporative disc clearing
Authors: Alexander, R. D.
Pascucci, I.
First Published: 1-May-2012
Citation: Monthly Notices of the Royal Astronomical Society Letters, 2012, 422 (1), pp. L82-L86
Abstract: We present models of giant planet migration in evolving protoplanetary discs. We show that disc clearing by extreme-ultraviolet photoevaporation can have a strong effect on the distribution of giant planet semimajor axes. During disc clearing, planet migration is slowed or accelerated in the region where photoevaporation opens a gap in the disc, resulting in ‘deserts’ where few giant planets are found and corresponding ‘pile-ups’ at smaller and larger radii. However, the precise locations and sizes of these features are strong functions of the efficiency of planetary accretion, and therefore also strongly dependent on planet mass. We suggest that photoevaporative disc clearing may be responsible for the pile-up of ∼Jupiter-mass planets at ∼1 au seen in exoplanet surveys, and show that observations of the distribution of exoplanet semimajor axes can be used to test models of both planet migration and disc clearing.
DOI Link: 10.1111/j.1745-3933.2012.01243.x
ISSN: 0035-8711
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2012 the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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