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Title: SN 2015ba: a Type IIP supernova with a long plateau
Authors: Dastidar, R
Misra, K
Hosseinzadeh, G
Pastorello, A
Pumo, M. L
Valenti, S
McCully, C
Tomasella, L
Arcavi, I
Elias-Rosa, N
Singh, M
Gangopadhyay, A
Howell, D. A
Morales-Garoffolo, A
Zampieri, L
Kumar, Brijesh
Turatto, M
Benetti, S
Tartaglia, L
Ochner. P
Sahu, D. K
Anupama, G. C
Pandey, S. B
Keywords: Techniques: photometric;Techniques: spectroscopic;Supernovae: general;Supernovae: individual: SN 2015ba;Galaxies: individual: IC 1029
Issue Date: Sep-2018
Publisher: Oxford University Press on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, Vol. 479, No. 2, pp. 2421–2442
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.
Description: Restricted Access
ISSN: 1365-2966
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Appears in Collections:IIAP Publications

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