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The superluminous transient ASASSN-15lh as a tidal disruption event from a Kerr black hole
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Number of Authors: 50
2016 (English)In: Nature astronomy, ISSN 2397-3366, Vol. 1, no 1, 0002Article in journal, Letter (Refereed) Published
Abstract [en]

When a star passes within the tidal radius of a supermassive black hole, it will be torn apart1. For a star with the mass of the Sun (M-circle dot) and a non-spinning black hole with a mass <10(8)M(circle dot), the tidal radius lies outside the black hole event horizon2 and the disruption results in a luminous flare(3-6). Here we report observations over a period of ten months of a transient, hitherto interpreted(7) as a superluminous supernova(8). Our data show that the transient rebrightened substantially in the ultraviolet and that the spectrum went through three different spectroscopic phases without ever becoming nebular. Our observations are more consistent with a tidal disruption event than a superluminous supernova because of the temperature evolution(6), the presence of highly ionized CNO gas in the line of sight(9) and our improved localization of the transient in the nucleus of a passive galaxy, where the presence of massive stars is highly unlikely(10,11). While the supermassive black hole has a mass >10(8)M(circle dot)(12,13), a star with the same mass as the Sun could be disrupted outside the event horizon if the black hole were spinning rapidly(14). The rapid spin and high black hole mass can explain the high luminosity of this event.

Place, publisher, year, edition, pages
2016. Vol. 1, no 1, 0002
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Physical Sciences
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URN: urn:nbn:se:su:diva-146023DOI: 10.1038/s41550-016-0002ISI: 000406527100002OAI: oai:DiVA.org:su-146023DiVA: diva2:1135470
Available from: 2017-08-23 Created: 2017-08-23 Last updated: 2017-08-23Bibliographically approved

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Fremling, ChristofferSollerman, Jesper
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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