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PTF12os and iPTF13bvn. Two stripped-envelope supernovae from low-mass progenitors in NGC 5806
Stockholm University, Faculty of Science, Department of Astronomy.
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2016 (English)In: \aap, Vol. 593Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2016. Vol. 593
Keyword [en]
supernovae: general, supernovae: individual: PTF12os, galaxies: individual: NGC 5806, techniques: image processing, supernovae: individual: iPTF13bvn
National Category
Natural Sciences
Research subject
Astronomy
Identifiers
URN: urn:nbn:se:su:diva-135750DOI: 10.1051/0004-6361/201628275OAI: oai:DiVA.org:su-135750DiVA: diva2:1048671
Available from: 2016-11-21 Created: 2016-11-21 Last updated: 2016-11-21
In thesis
1. PTF12os and iPTF13bvn: Two stripped-envelope supernovae discovered by the Palomar Transient Factory
Open this publication in new window or tab >>PTF12os and iPTF13bvn: Two stripped-envelope supernovae discovered by the Palomar Transient Factory
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is based on research made by the intermediate Palomar Transient Factory [(i)PTF], and it is particularly closely tied to the still ongoing research on the stripped-envelope (SE) supernova (SN), iPTF13bvn (Type Ib), that occurred in the nearby galaxy NGC 5806. This SN was initially thought to have been the explosion of a very massive Wolf-Rayet (WR) star, but I have shown that this is very likely not the case. I suggest instead that the most likely scenario is that iPTF13bvn originated from a binary system where the envelope was stripped off from the SN progenitor by tidal forces from a companion star, in a similar way as for the very well studied Type IIb SN 2011dh. I have also investigated another SE SN, PTF12os (Type IIb), that occurred in the same galaxy as iPTF13bvn, with the conclusion that PTF12os and iPTF13bvn are very similar amongst themselves, and that both of them are also remarkably similar to SN 2011dh, in terms of all of the available observations (light-curves, spectra). Hydrodynamical models have been used to constrain the explosion parameters of iPTF13bvn, PTF12os and SN 2011dh; finding 56Ni masses in the range 0.063 − 0.075 M⊙, ejecta masses in the range 1.85 − 1.91 M⊙. Using the 56Ni-masses derived from our hydrodynamical modeling in combination with nebular models and late-time spectroscopy we were able to constrain the Zero-Age Main Sequence (ZAMS) mass to ∼ 12 M⊙ for iPTF13bvn and ≲ 15 M⊙ for PTF12os. In current stellar evolution models, stars with these masses on the ZAMS cannot lose their hydrogen envelopes and become SE SNe without binary interactions.

Place, publisher, year, edition, pages
Stockholm: Stockholm University, 2016. 64 p.
Keyword
sovernovae
National Category
Other Natural Sciences
Identifiers
urn:nbn:se:su:diva-135752 (URN)
Presentation
2016-11-08, Albanova, 19:42 (English)
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Supervisors
Available from: 2016-11-22 Created: 2016-11-21 Last updated: 2016-11-22Bibliographically approved

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