Статья

The Diversity of Kilonova Emission in Short Gamma-Ray Bursts

B. P. GompertzDepartment of Physics, University of Warwick, Coventry CV4 7AL, UK; [email protected]A. J. LevanDepartment of Physics, University of Warwick, Coventry CV4 7AL, UK; [email protected]N. R. TanvirDepartment of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UKJ. HjorthDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen, DenmarkS. CovinoINAF, Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate (LC), ItalyP. A. EvansDepartment of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UKA. S. FruchterSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USAC. González-FernándezInstitute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UKZhi-Ping JinKey Laboratory of dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Science, Nanjing 210008, People's Republic of ChinaJ. D. LymanDepartment of Physics, University of Warwick, Coventry CV4 7AL, UK; [email protected]S. R. OatesDepartment of Physics, University of Warwick, Coventry CV4 7AL, UK; [email protected]P. T. O’BrienDepartment of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UKK. WiersemaDepartment of Physics, University of Warwick, Coventry CV4 7AL, UK; [email protected]

2018en

ABI

Аннотация

Abstract The historic first joint detection of both gravitational-wave and electromagnetic emission from a binary neutron star merger cemented the association between short gamma-ray bursts (SGRBs) and compact object mergers, as well as providing a well-sampled multi-wavelength light curve of a radioactive kilonova (KN) for the first time. Here, we compare the optical and near-infrared light curves of this KN, AT 2017gfo, to the counterparts of a sample of nearby ( z < 0.5) SGRBs to characterize their diversity in terms of their brightness distribution. Although at similar epochs AT 2017gfo appears fainter than every SGRB-associated KN claimed so far, we find three bursts (GRBs 050509B, 061201, and 080905A) where, if the reported redshifts are correct, deep upper limits rule out the presence of a KN similar to AT 2017gfo by several magnitudes. Combined with the properties of previously claimed KNe in SGRBs this suggests considerable diversity in the properties of KN drawn from compact object mergers, despite the similar physical conditions that are expected in many NS–NS mergers. We find that observer angle alone is not able to explain this diversity, which is likely a product of the merger type (NS–NS versus NS–BH) and the detailed properties of the binary (mass ratio, spins etc.). Ultimately disentangling these properties should be possible through observations of SGRBs and gravitational-wave sources, providing direct measurements of heavy element enrichment throughout the universe.

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Идентификаторы

DOI: 10.3847/1538-4357/aac206

Цитирования и источники

Цитирований: 2Использованных источников: 0

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