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Title: | SN 2015ba: a Type IIP supernova with a long plateau | Authors: | Dastidar, Raya Misra, Kuntal Hosseinzadeh, G. PASTORELLO, Andrea Pumo, M. L. Valenti, S. McCully, C. TOMASELLA, Lina Arcavi, I. ELIAS DE LA ROSA, NANCY DEL CARMEN Singh, Mridweeka Gangopadhyay, Anjasha Howell, D. A. Morales-Garoffolo, Antonia ZAMPIERI, Luca Kumar, Brijesh TURATTO, Massimo BENETTI, Stefano Tartaglia, L. Ochner, P. Sahu, D. K. Anupama, G. C. Pandey, S. B. |
Issue Date: | 2018 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 479 | Issue: | 2 | First Page: | 2421 | 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<SUB>☉</SUB>. 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. | URI: | http://hdl.handle.net/20.500.12386/27512 | URL: | https://academic.oup.com/mnras/article/479/2/2421/5042287 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/sty1634 | Bibcode ADS: | 2018MNRAS.479.2421D | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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