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Tidal disruption of planetary bodies by white dwarfs – II. Debris disc structure and ejected interstellar asteroids

Malamud, Uri and Perets, Hagai B. (2020) Tidal disruption of planetary bodies by white dwarfs – II. Debris disc structure and ejected interstellar asteroids. Monthly Notices of the Royal Astronomical Society, 493 (1). pp. 698-712. ISSN 0035-8711.

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We make use of a new hybrid method to simulate the long-term, multiple-orbit disc formation through tidal disruptions of rocky bodies by white dwarfs, at high-resolution and realistic semimajor axis. We perform the largest yet suite of simulations for dwarf and terrestrial planets, spanning four orders of magnitude in mass, various pericentre distances, and semimajor axes between 3 and 150 au. This large phase space of tidal disruption conditions has not been accessible through the use of previous codes. We analyse the statistical and structural properties of the emerging debris discs, as well as the ejected unbound debris contributing to the population of interstellar asteroids. Unlike previous tidal disruption studies of small asteroids which form ring-like structures on the original orbit, we find that the tidal disruption of larger bodies usually forms dispersed structures of interlaced elliptic eccentric annuli on tighter orbits. We characterize the (typically power law) size distribution of the ejected interstellar bodies as well as their composition, rotation velocities, and ejection velocities. We find them to be sensitive to the depth (impact parameter) of the tidal disruption. Finally, we briefly discuss possible implications of our results in explaining the peculiar variability of Tabby’s star, the origin of the transit events of ZTF J0139+5245 and the formation of a planetary core around SDSS J1228+1040.

Item Type:Article
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URLURL TypeDescription Paper
Malamud, Uri0000-0003-3948-6813
Perets, Hagai B.0000-0002-5004-199X
Additional Information:© 2020 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 ( Received: 21 November 2019; Revision received: 09 January 2020; Accepted: 12 January 2020; Published: 16 January 2020. We wish to thank the anonymous reviewer for excellent suggestions and comments that have greatly improved this manuscript. UM and HBP acknowledge support from the Minerva center for life under extreme planetary conditions, the Israeli Science and Technology ministry Ilan Ramon grant and the Israel Science Foundation (ISF) I-CORE grant 1829/12.
Funding AgencyGrant Number
Ministry of Science and Technology (Israel)UNSPECIFIED
Israel Science Foundation1829/12
Subject Keywords:hydrodynamics, white dwarfs, transients: tidal disruption events
Issue or Number:1
Record Number:CaltechAUTHORS:20200326-091802313
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Official Citation:Uri Malamud, Hagai B Perets, Tidal disruption of planetary bodies by white dwarfs – II. Debris disc structure and ejected interstellar asteroids, Monthly Notices of the Royal Astronomical Society, Volume 493, Issue 1, March 2020, Pages 698–712, Download citation
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102121
Deposited By: Tony Diaz
Deposited On:27 Mar 2020 03:14
Last Modified:27 Mar 2020 03:14

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