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A type la supernova at the heart of superluminous transient SN 2006gy
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Max Planck Institute for Astrophysics, Germany.ORCID iD: 0000-0001-8005-4030
Number of Authors: 32020 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 367, no 6476, p. 415-418Article in journal (Refereed) Published
Abstract [en]

Superluminous supernovae radiate up to 100 times more energy than normal supernovae. The origin of this energy and the nature of the stellar progenitors of these transients are poorly understood. We identify neutral iron lines in the spectrum of one such supernova, SN 2006gy, and show that they require a large mass of iron (greater than or similar to 0.3 solar masses) expanding at 1500 kilometers per second. By modeling a standard type la supernova hitting a shell of circumstellar material, we produce a light curve and late-time iron-dominated spectrum that match the observations of SN 2006gy. In such a scenario, common envelope evolution of a progenitor binary system can synchronize envelope ejection and supernova explosion and may explain these bright transients.

Place, publisher, year, edition, pages
2020. Vol. 367, no 6476, p. 415-418
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-179611DOI: 10.1126/science.aaw1469ISI: 000509810200035PubMedID: 31974248OAI: oai:DiVA.org:su-179611DiVA, id: diva2:1415174
Available from: 2020-03-17 Created: 2020-03-17 Last updated: 2020-03-17Bibliographically approved

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