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Massive disc formation in the tidal disruption of a neutron star by a nearly extremal black hole

Lovelace, Geoffrey and Duez, Matthew D. and Foucart, Francois and Kidder, Lawrence E. and Pfeiffer, Harald P. and Scheel, Mark A. and Szilágyi, Béla (2013) Massive disc formation in the tidal disruption of a neutron star by a nearly extremal black hole. Classical and Quantum Gravity, 30 (13). Art. No. 135004. ISSN 0264-9381.

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Black hole–neutron star (BHNS) binaries are important sources of gravitational waves for second-generation interferometers, and BHNS mergers are also a proposed engine for short, hard gamma-ray bursts. The behavior of both the spacetime (and thus the emitted gravitational waves) and the neutron-star matter in a BHNS merger depend strongly and nonlinearly on the black hole's spin. While there is a significant possibility that astrophysical black holes could have spins that are nearly extremal (i.e. near the theoretical maximum), to date fully relativistic simulations of BHNS binaries have included black-hole spins only up to S/M^2 = 0.9, which corresponds to the black hole having approximately half as much rotational energy as possible, given the black hole's mass. In this paper, we present a new simulation of a BHNS binary with a mass ratio q = 3 and black-hole spin S/M^2 = 0.97, the highest simulated to date. We find that the black hole's large spin leads to the most massive accretion disc and the largest tidal tail outflow of any fully relativistic BHNS simulations to date, even exceeding the results implied by extrapolating results from simulations with lower black-hole spin. The disc appears to be remarkably stable. We also find that the high black-hole spin persists until shortly before the time of merger; afterward, both merger and accretion spin down the black hole.

Item Type:Article
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URLURL TypeDescription Paper
Lovelace, Geoffrey0000-0002-7084-1070
Duez, Matthew D.0000-0002-0050-1783
Foucart, Francois0000-0003-4617-4738
Kidder, Lawrence E.0000-0001-5392-7342
Pfeiffer, Harald P.0000-0001-9288-519X
Additional Information:© 2013 Institute of Physics. Received 26 February 2013, in final form 8 May 2013. Published 3 June 2013. We are pleased to thank Christian Ott, Robert Owen, and Saul Teukolsky for helpful discussions. This work was supported in part by grants from the Sherman Fairchild Foundation to Cornell and Caltech, by NSF grant nos PHY-0969111 and PHY-1005426 at Cornell; by NSF grant nos PHY-1068881 and PHY-1005655 at Caltech; by NASA grant no NNX09AF96G at Cornell; and NASA grant no NNX11AC37G and NSF grant PHY-1068243 to WSU. The numerical computations presented in this paper were performed primarily on the Caltech compute cluster ZWICKY, which was funded by the Sherman Fairchild Foundation and the NSF MRI-R2 grant no PHY-0960291 to Caltech.
Funding AgencyGrant Number
Sherman Fairchild FoundationUNSPECIFIED
NSF MRI-R2PHY-0960291
Issue or Number:13
Classification Code:PACS: 04.25.dg, 04.40.Dg, 47.75.+f, 95.30.Sf, 04.30.−w, 97.60.Jd, 98.70.Rz, 98.58.Fd, 98.58.Nk, 04.20.Gz, 97.60.Lf. MSC: 83C35, 83C57, 83D05
Record Number:CaltechAUTHORS:20130810-101203653
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Official Citation:Massive disc formation in the tidal disruption of a neutron star by a nearly extremal black hole Geoffrey Lovelace, Matthew D Duez, Francois Foucart, Lawrence E Kidder, Harald P Pfeiffer, Mark A Scheel and Béla Szilágyi doi:10.1088/0264-9381/30/13/135004
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39850
Deposited By: Ruth Sustaita
Deposited On:12 Aug 2013 15:18
Last Modified:09 Mar 2020 13:19

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