%0 Journal Article 
%A Dastidar, Raya
%A Misra, Kuntal
%A Hosseinzadeh, G.
%A Pastorello, A.
%A Pumo, M. L.
%A Valenti, S.
%A McCully, C.
%A Tomasella, L.
%A Arcavi, I.
%A Elias-Rosa, N.
%A Singh, Mridweeka
%A Gangopadhyay, Anjasha
%A Howell, D. A.
%A Morales Garoffolo, Antonia Isabel
%A Zampieri, L.
%A Kumar, Brijesh
%A Turatto, M.
%A Benetti, S.
%A Tartaglia, L.
%A Ochner, P.
%A Sahu, D. K.
%A Anupama, G. C.
%A Pandey, S. B.
%T SN 2015ba: A Type IIP supernova with a long plateau
%D 2018
%@ 1365-2966

%U http://hdl.handle.net/10498/33081
%X 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±0.7Mpc using the expanding photosphere and standard candlemethods.
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-coremasses and the zero-age
main sequence mass of pre-supernova stars and/or uncertainties in the mixing scenario in the
ejecta of supernovae.
%K techniques: photometric
%K techniques: spectroscopic
%K supernovae: general
%K supernovae: individual: SN 2015ba
%K galaxies: individual: IC 1029
%~ Universidad de Cádiz