SN 2015ba: A type IIP supernova with a long plateau
| Autor: | G. C. Anupama, Massimo Turatto, D. K. Sahu, S. Valenti, S. Benetti, Maria Letizia Pumo, Anjasha Gangopadhyay, Iair Arcavi, D. A. Howell, A. Morales-Garoffolo, Raya Dastidar, Leonardo Tartaglia, S. B. Pandey, Brijesh Kumar, P. Ochner, A. Pastorello, L. Tomasella, Curtis McCully, Griffin Hosseinzadeh, M. J. Singh, Luca Zampieri, Kuntal Misra, Nancy Elias-Rosa |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Galaxies: individual: IC 1029
Supernovae: general Techniques: spectroscopic FOS: Physical sciences Astrophysics 01 natural sciences Spectral line Photometry (optics) symbols.namesake 0103 physical sciences Supernovae: individual: SN 2015ba Ejecta 010303 astronomy & astrophysics Physics High Energy Astrophysical Phenomena (astro-ph.HE) Photosphere 010308 nuclear & particles physics Galaxies: individual: IC 1029 Supernovae: general Supernovae: individual: SN 2015ba Techniques: photometric Techniques: spectroscopic Astronomy and Astrophysics Space and Planetary Science Balmer series Astronomy and Astrophysics Galaxy Stars Supernova Space and Planetary Science symbols Astrophysics - High Energy Astrophysical Phenomena Techniques: photometric |
| Popis: | We present optical photometry and spectroscopy from about a week after explosion to $\sim$272 d of an atypical Type IIP supernova, SN 2015ba, which exploded in the edge-on galaxy IC 1029. SN 2015ba is a luminous event with an absolute V-band magnitude of -17.1$\pm$0.2 mag at 50 d since explosion and has a long plateau lasting for $\sim$123 d. The distance to the SN is estimated to be 34.8$\pm$0.7 Mpc using the expanding photosphere and standard candle methods. High-velocity H-Balmer components constant with time are observed in the late-plateau phase spectra of SN 2015ba, which suggests a possible role of circumstellar interaction at these phases. Both hydrodynamical and analytical modelling suggest a massive progenitor of SN 2015ba with a pre-explosion mass of 24-26 M$_\odot$. 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. 42 pages, 7 pages Appendix, 20 figures, 10 tables, Accepted for publication in MNRAS, 14-June-2018 |
| Databáze: | OpenAIRE |
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