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The spins of compact objects born from helium stars in binary systems

Fuller, Jim and Lu, Wenbin (2022) The spins of compact objects born from helium stars in binary systems. Monthly Notices of the Royal Astronomical Society, 511 (3). pp. 3951-3964. ISSN 0035-8711. doi:10.1093/mnras/stac317.

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The angular momentum (AM) content of massive stellar cores helps us to determine the natal spin rates of neutron stars and black holes. Asteroseismic measurements of low-mass stars have proven that stellar cores rotate slower than predicted by most prior work, so revised models are necessary. In this work, we apply an updated AM transport model based on the Tayler instability to massive helium stars in close binaries, in which tidal spin-up can greatly increase the star’s AM. Consistent with prior work, these stars can produce highly spinning black holes upon core-collapse if the orbital period is less than P_(orb) ≲ 1d⁠. For neutron stars, we predict a strong correlation between the pre-explosion mass and the neutron star rotation rate, with millisecond periods (⁠P_(NS) ≲ 5ms⁠) only achievable for massive (⁠M≳10M⊙⁠) helium stars in tight (⁠P_(orb) ≲ 1d⁠) binaries. Finally, we discuss our models in relation to type Ib/c supernovae, superluminous supernove, gamma-ray bursts, and LIGO/Virgo measurements of black hole spins. Our models are roughly consistent with the rates and energetics of these phenomena, with the exception of broad-lined Ic supernovae, whose high rates and ejecta energies are difficult to explain.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper ItemMESA models and source code
Fuller, Jim0000-0002-4544-0750
Lu, Wenbin0000-0002-1568-7461
Additional Information:© 2022 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2022 February 1. Received 2022 January 28; in original form 2021 October 10. Published: 04 February 2022. We thank the anonymous referee for a constructive review. JF is thankful for support through an Innovator Grant from The Rose Hills Foundation, and the Sloan Foundation through grant FG-2018-10515. WL is supported by the Lyman Spitzer, Jr. Fellowship at Princeton University. Data Availability: MESA models and source code are available to download at Analysis scripts are available upon request to the authors.
Group:TAPIR, Astronomy Department
Funding AgencyGrant Number
Rose Hills FoundationUNSPECIFIED
Alfred P. Sloan FoundationFG-2018-10515
Princeton UniversityUNSPECIFIED
Subject Keywords:stars: binaries: general –stars: black holes –stars: massive –stars: rotation –stars: supernovae: general –stars: Wolf- Rayet
Issue or Number:3
Record Number:CaltechAUTHORS:20220420-859392300
Persistent URL:
Official Citation:Jim Fuller, Wenbin Lu, The spins of compact objects born from helium stars in binary systems, Monthly Notices of the Royal Astronomical Society, Volume 511, Issue 3, April 2022, Pages 3951–3964,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:114391
Deposited By: Tony Diaz
Deposited On:21 Apr 2022 12:36
Last Modified:21 Apr 2022 12:36

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