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SN 2015ba: a Type IIP supernova with a long plateau
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Number of Authors: 232018 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 479, no 2, p. 2421-2442Article in journal (Refereed) Published
Abstract [en]

We present optical photometry and spectroscopy from about a week after explosion to similar to 272 d of an atypical Type IIP supernova, SN 2015ba, which exploded in the edge-on galaxy IC 1029. SN 2015ba is a luminous event with an absolute V-band magnitude of -17.1 +/- 0.2 mag at 50 d since explosion and has a long plateau lasting for similar to 123 d. The distance to the SN is estimated to be 34.8 +/- 0.7 Mpc using the expanding photosphere and standard candle methods. High-velocity H Balmer components constant with time are observed in the late-plateau phase spectra of SN 2015ba, which suggests a possible role of circumstellar interaction at these phases. Both hydrodynamical and analytical modelling suggest a massive progenitor of SN 2015ba with a pre-explosion mass of 24-26 M-circle dot. However, the nebular spectra of SN 2015ba exhibit insignificant levels of oxygen, which is otherwise expected from a massive progenitor. This might be suggestive of the non-monotonical link between O-core masses and the zero-age main sequence mass of pre-supernova stars and/or uncertainties in the mixing scenario in the ejecta of supernovae.

Place, publisher, year, edition, pages
2018. Vol. 479, no 2, p. 2421-2442
Keywords [en]
techniques: photometric, techniques: spectroscopic, supernovae: general, supernovae: individual: SN 2015ba, galaxies: individual: IC 1029
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-160048DOI: 10.1093/mnras/sty1634ISI: 000441380100069OAI: oai:DiVA.org:su-160048DiVA, id: diva2:1255311
Available from: 2018-10-11 Created: 2018-10-11 Last updated: 2018-10-11Bibliographically approved

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Dastidar, RayaMcCully, C.Tartaglia, Leonardo
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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Astronomy, Astrophysics and Cosmology

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