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SN 2015ba: a Type IIP supernova with a long plateau

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dc.contributor.author Dastidar, R
dc.contributor.author Misra, K
dc.contributor.author Hosseinzadeh, G
dc.contributor.author Pastorello, A
dc.contributor.author Pumo, M. L
dc.contributor.author Valenti, S
dc.contributor.author McCully, C
dc.contributor.author Tomasella, L
dc.contributor.author Arcavi, I
dc.contributor.author Elias-Rosa, N
dc.contributor.author Singh, M
dc.contributor.author Gangopadhyay, A
dc.contributor.author Howell, D. A
dc.contributor.author Morales-Garoffolo, A
dc.contributor.author Zampieri, L
dc.contributor.author Kumar, Brijesh
dc.contributor.author Turatto, M
dc.contributor.author Benetti, S
dc.contributor.author Tartaglia, L
dc.contributor.author Ochner, P
dc.contributor.author Sahu, D. K
dc.contributor.author Anupama, G. C
dc.contributor.author Pandey, S. B
dc.date.accessioned 2020-11-10T13:43:32Z
dc.date.available 2020-11-10T13:43:32Z
dc.date.issued 2018-09
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 479, No. 2, pp. 2421-2442 en_US
dc.identifier.issn 1365-2966
dc.identifier.uri http://prints.iiap.res.in/handle/2248/6794
dc.description Restricted Access © Royal Astronomical Society; https://doi.org/10.1093/mnras/sty1634 en_US
dc.description.abstract We present optical photometry and spectroscopy from about a week after explosion 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 ∼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⊙. 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. en_US
dc.language.iso en en_US
dc.publisher Oxford University Press on behalf of the Royal Astronomical Society en_US
dc.subject Techniques: photometric en_US
dc.subject Techniques: spectroscopic en_US
dc.subject Supernovae: general en_US
dc.subject Supernovae: individual: SN 2015ba en_US
dc.subject Galaxies: individual: IC 1029 en_US
dc.title SN 2015ba: a Type IIP supernova with a long plateau en_US
dc.type Article en_US

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