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Published August 10, 2019 | Accepted Version + Published
Journal Article Open

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

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.

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.

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Published - Kremer_2019_ApJ_881_75.pdf

Accepted Version - 1904.06353.pdf

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