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A gap in the mass distribution for warm Neptune and terrestrial planets

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Armstrong, David J., Meru, Farzana, Bayliss, Daniel D. R., Kennedy, Grant M. and Veras, Dimitri (2019) A gap in the mass distribution for warm Neptune and terrestrial planets. The Astrophysical Journal Letters, 880 . L1. doi:10.3847/2041-8213/ab2ba2

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Official URL: https://doi.org/10.3847/2041-8213/ab2ba2

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Abstract

Structure in the planet distribution provides an insight into the processes that shape the formation and evolution of planets. The Kepler mission has led to an abundance of statistical discoveries in regards to planetary radius, but the number of observed planets with measured masses is much smaller. By incorporating results from recent mass determination programs, we have discovered a new gap emerging in the planet population for sub-Neptune-mass planets with orbital periods less than 20 days. The gap follows a slope of decreasing mass with increasing orbital period, has a width of a few M ⊕, and is potentially completely devoid of planets. Fitting Gaussian mixture models to the planet population in this region favors a bimodel distribution over a unimodel one with a reduction in Bayesian information criterion of 19.9, highlighting the gap significance. We discuss several processes that could generate such a feature in the planet distribution, including a pileup of planets above the gap region, tidal interactions with the host star, dynamical interactions with the disk, with other planets, or with accreting material during the formation process.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Extrasolar planets , Stars with planets , Planets -- Internal structure
Journal or Publication Title: The Astrophysical Journal Letters
Publisher: Institute of Physics Publishing, Inc.
ISSN: 2041-8205
Official Date: 17 July 2019
Dates:
DateEvent
17 July 2019Available
20 June 2019Accepted
Volume: 880
Article Number: L1
DOI: 10.3847/2041-8213/ab2ba2
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
Copyright Holders: © 2019. The American Astronomical Society.
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
ST/R00384X/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
ST/P003850/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
Dorothy Hodgkin Fellowship[RS] Royal Societyhttp://dx.doi.org/10.13039/501100000288
University Research Fellowship[RS] Royal Societyhttp://dx.doi.org/10.13039/501100000288
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