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SN 2017ens: The Metamorphosis of a Luminous Broadlined Type Ic Supernova into an SN IIn
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Number of Authors: 492018 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 867, no 2, article id L31Article in journal (Refereed) Published
Abstract [en]

We present observations of supernova (SN) 2017ens, discovered by the ATLAS survey and identified as a hot blue object through the GREAT program. The redshift z = 0.1086 implies a peak brightness of M-g = -21.1 mag, placing the object within the regime of superluminous supernovae. We observe a dramatic spectral evolution, from initially being blue and featureless, to later developing features similar to those of the broadlined Type Ic SN 1998bw, and finally showing 2000 km s(-1) wide H alpha and H beta emission. Relatively narrow Balmer emission (reminiscent of a SN IIn) is present at all times. We also detect coronal lines, indicative of a dense circumstellar medium. We constrain the progenitor wind velocity to similar to 50-60 km s(-1) based on P-Cygni profiles, which is far slower than those present in Wolf-Rayet stars. This may suggest that the progenitor passed through a luminous blue variable phase, or that the wind is instead from a binary companion red supergiant star. At late times we see the similar to 2000 km s(-1) wide H alpha emission persisting at high luminosity (similar to 3 x 10(40) erg s(-1)) for at least 100 day, perhaps indicative of additional mass loss at high velocities that could have been ejected by a pulsational pair instability.

Place, publisher, year, edition, pages
2018. Vol. 867, no 2, article id L31
Keywords [en]
supernovae: general, supernovae: individual (SN 2017ens)
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-162853DOI: 10.3847/2041-8213/aaeb2eISI: 000450221300001OAI: oai:DiVA.org:su-162853DiVA, id: diva2:1274882
Available from: 2019-01-03 Created: 2019-01-03 Last updated: 2019-01-03Bibliographically approved

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Chen, T.-W.Schady, P.Sollerman, JesperTaddia, FrancescoGalbany, L.
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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