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Title: Radioactively powered emission from black hole-neutron star mergers

Detection of the electromagnetic counterparts of gravitational wave (GW) sources is important to unveil the nature of compact binary coalescences. We perform three-dimensional, time-dependent, multi-frequency radiative transfer simulations for radioactively powered emission from the ejecta of black hole (BH)-neutron star (NS) mergers. Depending on the BH to NS mass ratio, spin of the BH, and equations of state of dense matter, BH-NS mergers can eject more material than NS-NS mergers. In such cases, radioactively powered emission from the BH-NS merger ejecta can be more luminous than that from NS-NS mergers. We show that, in spite of the expected larger distances to BH-NS merger events, the observed brightness of BH-NS mergers can be comparable to or even higher than that of NS-NS mergers. We find that, when the tidally disrupted BH-NS merger ejecta are confined to a small solid angle, the emission from BH-NS merger ejecta tends to be bluer than that from NS-NS merger ejecta for a given total luminosity. Thanks to this property, we might be able to distinguish BH-NS merger events from NS-NS merger events by multi-band observations of the radioactively powered emission. In addition to the GW observations, such electromagnetic observations can potentially provide independent information onmore » the progenitors of GW sources and the nature of compact binary coalescences.« less
Authors:
;  [1] ;  [2] ;  [3] ; ; ;  [4]
  1. National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 (Japan)
  2. Department of Physics, Kyoto University, Kyoto 606-8502 (Japan)
  3. Department of Physics, University of Wisconsin-Milwaukee, P.O. Box 413, Milwaukee, WI 53201 (United States)
  4. Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)
Publication Date:
OSTI Identifier:
22348366
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 780; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; BLACK HOLES; COALESCENCE; COSMIC GAMMA BURSTS; DETECTION; EMISSION; EQUATIONS OF STATE; GRAVITATIONAL WAVES; LUMINOSITY; MASS; NEUTRON STARS; NUCLEOSYNTHESIS; RADIANT HEAT TRANSFER; SIMULATION; SPIN; TIME DEPENDENCE