A fast evolving luminous transient discovered by K2/Kepler
Author
dc.contributor.author
Rest, A.
Author
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Garnavich, P. M.
Author
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Khatami, D.
Author
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Kasen, D.
Author
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Tucker, B. E.
Author
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Shaya, E. J.
Author
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Olling, R. P.
Author
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Mushotzky, R.
Author
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Zenteno, A.
Author
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Margheim, S.
Author
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Strampelli, G.
Author
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Neill, James D.
Author
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Smith, R. C.
Author
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Forster, Francisco
Author
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Villar, V. A.
Admission date
dc.date.accessioned
2018-07-23T14:16:22Z
Available date
dc.date.available
2018-07-23T14:16:22Z
Publication date
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2018
Cita de ítem
dc.identifier.citation
Nature Astronomy Vol. 2 (4): 307-311
es_ES
Identifier
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10.1038/s41550-018-0423-2
Identifier
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https://repositorio.uchile.cl/handle/2250/150137
Abstract
dc.description.abstract
For decades, optical time-domain searches have been tuned to find ordinary supernovae, which rise and fall in brightness over a period of weeks. Recently, supernova searches have improved their cadences and a handful of fast-evolving luminous transients have been identified(1-5). These have peak luminosities comparable to type Ia supernovae, but rise to maximum in less than ten days and fade from view in less than one month. Here we present the most extreme example of this class of object thus far: KSN 2015K, with a rise time of only 2.2 days and a time above half-maximum of only 6.8 days. We show that, unlike type Ia supernovae, the light curve of KSN 2015K was not powered by the decay of radioactive elements. We further argue that it is unlikely that it was powered by continuing energy deposition from a central remnant (a magnetar or black hole). Using numerical radiation hydrodynamical models, we show that the light curve of KSN 2015K is well fitted by a model where the supernova runs into external material presumably expelled in a pre-supernova mass-loss episode. The rapid rise of KSN 2015K therefore probes the venting of photons when a hypersonic shock wave breaks out of a dense extended medium.
es_ES
Patrocinador
dc.description.sponsorship
NASA
NNH15ZDA001N
NNX17AI64G
Australian Research Council Centre of Excellence for All-sky Astrophysics
CE110001020