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A balanced budget view on forming giant planets by pebble accretion

Lin, Jonathan W. and Lee, Eve J. and Chiang, Eugene (2018) A balanced budget view on forming giant planets by pebble accretion. Monthly Notices of the Royal Astronomical Society, 480 (4). pp. 4338-4354. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20181128-161040320

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Abstract

Pebble accretion refers to the assembly of rocky planet cores from particles whose velocity dispersions are damped by drag from circumstellar disc gas. Accretion cross-sections can approach maximal Hill-sphere scales for particles whose Stokes numbers approach unity. While fast, pebble accretion is also lossy. Gas drag brings pebbles to protocores but also sweeps them past; those particles with the largest accretion cross-sections also have the fastest radial drift speeds and are the most easily drained out of discs. We present a global model of planet formation by pebble accretion that keeps track of the disc’s mass budget. Cores, each initialized with a lunar mass, grow from discs whose finite stores of mm–cm-sized pebbles drift inward across all radii in viscously accreting gas. For every 1 M_⊕ netted by a core, at least 10 M_⊕ and possibly much more are lost to radial drift. Core growth rates are typically exponentially sensitive to particle Stokes number, turbulent Mach number, and solid surface density. This exponential sensitivity, when combined with disc migration, tends to generate binary outcomes from 0.1 to 30 au: either sub-Earth cores remain sub-Earth, or explode into Jupiters, with the latter migrating inward to varying degrees. When Jupiter-breeding cores assemble from mm–cm-sized pebbles, they do so in discs where such particles drain out in ∼10^5 yr or less; such fast-draining discs do not fit mm-wave observations.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/sty2159DOIArticle
https://arxiv.org/abs/1806.00487arXivDiscussion Paper
ORCID:
AuthorORCID
Lee, Eve J.0000-0002-1228-9820
Chiang, Eugene0000-0002-6246-2310
Additional Information:© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) Accepted 2018 August 5. Received 2018 July 31; in original form 2018 May 22. We thank Bertram Bitsch, Jeffrey Fung, Anders Johansen, Michiel Lambrechts, Wladimir Lyra, Ruth Murray-Clay, Chris Ormel, Diana Powell, Michael Rosenthal, Julia Venturini, and an anonymous referee for comments that helped to improve the manuscript. JWL and EC acknowledge support from the National Science Foundation and a Berkeley Excellence Accounts for Ressearch (BEAR) grant. EJL is supported by the Sherman Fairchild Fellowship from Caltech. This research used the Savio computational cluster resource provided by the Berkeley Research Computing program at the University of California, Berkeley (supported by the UC Berkeley Chancellor, Vice Chancellor for Research, and Chief Information Officer).
Group:TAPIR, Walter Burke Institute for Theoretical Physics
Funders:
Funding AgencyGrant Number
NSFUNSPECIFIED
University of California, BerkeleyUNSPECIFIED
Sherman Fairchild FoundationUNSPECIFIED
Subject Keywords:planets and satellites: formation, protoplanetary discs
Record Number:CaltechAUTHORS:20181128-161040320
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181128-161040320
Official Citation:Jonathan W Lin, Eve J Lee, Eugene Chiang; A balanced budget view on forming giant planets by pebble accretion, Monthly Notices of the Royal Astronomical Society, Volume 480, Issue 4, 11 November 2018, Pages 4338–4354, https://doi.org/10.1093/mnras/sty2159
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91323
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:29 Nov 2018 15:43
Last Modified:29 Nov 2018 15:43

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