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Planet migration in self-gravitating discs : survival of planets

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Rowther, Sahl and Meru, Farzana (2020) Planet migration in self-gravitating discs : survival of planets. Monthly Notices of the Royal Astronomical Society, 496 (2). pp. 1598-1609. doi:10.1093/mnras/staa1590 ISSN 1745-3933.

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Official URL: https://doi.org/10.1093/mnras/staa1590

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Abstract

We carry out three-dimensional SPH simulations to study whether planets can survive in self-gravitating protoplanetary discs. The discs modelled here use a cooling prescription that mimics a real disc which is only gravitationally unstable in the outer regions. We do this by modelling the cooling using a simplified method such that the cooling time in the outer parts of the disc is shorter than in the inner regions, as expected in real discs. We find that both giant (>MSat) and low mass (<MNep) planets initially migrate inwards very rapidly, but are able to slow down in the inner gravitationally stable regions of the disc without needing to open up a gap. This is in contrast to previous studies where the cooling was modelled in a more simplified manner where regardless of mass, the planets were unable to slow down their inward migration. This shows the important effect the thermodynamics has on planet migration. In a broader context, these results show that planets that form in the early stages of the discs’ evolution, when they are still quite massive and self-gravitating, can survive.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Extrasolar planets, Astronomy, Astrophysics, Hydrodynamics, Planets
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
ISSN: 1745-3933
Official Date: August 2020
Dates:
DateEvent
August 2020Published
8 June 2020Available
1 June 2020Accepted
Volume: 496
Number: 2
Page Range: pp. 1598-1609
DOI: 10.1093/mnras/staa1590
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Sahl Rowther, Farzana Meru, Planet migration in self-gravitating discs: survival of planets, Monthly Notices of the Royal Astronomical Society, Volume 496, Issue 2, August 2020, Pages 1598–1609, is available online at: https://doi.org/10.1093/mnras/staa1590
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 8 July 2020
Date of first compliant Open Access: 10 July 2020
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIED[RS] Royal Societyhttp://dx.doi.org/10.13039/501100000288
UNSPECIFIEDDorothy Hodgkin FellowshipUNSPECIFIED
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