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Tidal Disruptions of Stars by Black Hole Remnants in Dense Star Clusters

Kremer, Kyle and Lu, Wenbin and Rodriguez, Carl L. and Lachat, Mitchell and Rasio, Frederic A. (2019) Tidal Disruptions of Stars by Black Hole Remnants in Dense Star Clusters. Astrophysical Journal, 881 (1). Art. No. 75. ISSN 1538-4357. https://resolver.caltech.edu/CaltechAUTHORS:20190814-092011508

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Abstract

In a dense stellar environment, such as the core of a globular cluster (GC), dynamical interactions with black holes (BHs) are expected to lead to a variety of astrophysical transients. Here we explore tidal disruption events (TDEs) of stars by stellar-mass BHs through collisions and close encounters. Using state-of-the-art cluster simulations, we show that these TDEs occur at significant rates throughout the evolution of typical GCs and we study how their relative rates relate to cluster parameters such as mass and size. By incorporating a realistic cosmological model of GC formation, we predict a BH–main-sequence-star TDE rate of approximately 3 Gpc^(−3) yr^(−1) in the local universe (z< 0.1) and a cosmological rate that peaks at roughly 25 Gpc^(−3) yr^(−1) for redshift 3. Furthermore, we show that the ejected mass associated with these TDEs could produce optical transients of luminosity ~10^(41)−10^(44) erg s^(−1) with timescales of about a day to a month. These should be readily detectable by optical transient surveys such as the Zwicky Transient Facility. Finally, we comment briefly on BH–giant encounters and discuss how these events may contribute to the formation of BH–white-dwarf binaries.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/ab2e0cDOIArticle
https://arxiv.org/abs/1904.06353arXivDiscussion Paper
ORCID:
AuthorORCID
Kremer, Kyle0000-0002-4086-3180
Lu, Wenbin0000-0002-1568-7461
Rodriguez, Carl L.0000-0003-4175-8881
Rasio, Frederic A.0000-0002-7132-418X
Additional Information:© 2019 The American Astronomical Society. Received 2019 April 8; revised 2019 June 18; accepted 2019 June 29; published 2019 August 14. We thank Sasha Tchekhovskoy, Pablo Marchant, Johan Samsing, Michael Zevin, and Enrico Ramirez-Ruiz for useful discussions. We also acknowledge discussions with Tony Piro and Eliot Quataert on wind reprocessing. This work was supported by NASA ATP Grant NNX14AP92G and NSF Grant AST-1716762. K.K. acknowledges support by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1324585. W.L. is supported by the David and Ellen Lee Fellowship at Caltech.
Group:TAPIR, Walter Burke Institute for Theoretical Physics
Funders:
Funding AgencyGrant Number
NASANNX14AP92G
NSFAST-1716762
NSF Graduate Research FellowshipDGE-1324585
David and Ellen Lee Postdoctoral ScholarshipUNSPECIFIED
Subject Keywords:globular clusters: general – methods: numerical – stars: black holes – stars: kinematics and dynamics
Issue or Number:1
Record Number:CaltechAUTHORS:20190814-092011508
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190814-092011508
Official Citation:Kyle Kremer et al 2019 ApJ 881 75
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97880
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:14 Aug 2019 16:32
Last Modified:03 Oct 2019 21:35

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