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The supernova CSS121015:004244+132827: a clue for understanding superluminous supernovae
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Number of Authors: 27
2014 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 441, no 1, 289-303 p.Article in journal (Refereed) Published
Abstract [en]

We present optical photometry and spectra of the superluminous Type II/IIn supernova (SN) CSS121015: 004244+132827 (z = 0.2868) spanning epochs from -30 d (rest frame) to more than 200 d after maximum. CSS121015 is one of the more luminous SNe ever found and one of the best observed. The photometric evolution is characterized by a relatively fast rise to maximum (similar to 40 d in the SN rest frame), and by a linear post-maximum decline. The light curve shows no sign of a break to an exponential tail. A broad Ha is first detected at similar to+40 d (rest frame). Narrow, barely resolved Balmer and [O III] 5007 angstrom lines, with decreasing strength, are visible along the entire spectral evolution. The spectra are very similar to other superluminous supernovae (SLSNe) with hydrogen in their spectrum, and also to SN 2005gj, sometimes considered Type Ia interacting with H-rich circumstellar medium. The spectra are also similar to a subsample of H-deficient SLSNe. We propose that the properties of CSS121015 are consistent with the interaction of the ejecta with a massive, extended, opaque shell, lost by the progenitor decades before the final explosion, although a magnetar-powered model cannot be excluded. Based on the similarity of CSS121015 with other SLSNe (with and without H), we suggest that the shocked-shell scenario should be seriously considered as a plausible model for both types of SLSN.

Place, publisher, year, edition, pages
2014. Vol. 441, no 1, 289-303 p.
Keyword [en]
supernovae: general, supernovae: individual: CSS121015: 004244+132827
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-105179DOI: 10.1093/mnras/stu538ISI: 000336249300019OAI: oai:DiVA.org:su-105179DiVA: diva2:732567
Funder
EU, European Research Council, 267251EU, FP7, Seventh Framework Programme, 307260EU, European Research Council, 291222
Note

AuthorCount:27;

Available from: 2014-07-04 Created: 2014-06-24 Last updated: 2017-12-05Bibliographically approved

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