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Title: SN 2015bp: adding to the growing population of transitional Type Ia supernovae
Authors: Srivastav, S
Anupama, G. C
Sahu, D. K
Ravikumar, C. D
Keywords: Supernovae: general;Supernovae: individual: iPTF13ebh;Supernovae: individual: SN 2015bp;Galaxies: individual: NGC 5839.
Issue Date: Apr-2017
Publisher: Oxford University Press on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, Vol. 466, No. 2, pp. 2436–2449
Abstract: Photometric and spectroscopic observations of Type Ia supernova 2015bp are presented, spanning ∼−6 to ∼+141 d since B-band maximum. Also presented are unpublished HCT spectra of type Ia iPTF13ebh between −11 and +34 d since B-band maximum. SN 2015bp shows rapidly declining light curves with Δm15(B) = 1.72 ± 0.04. The I-band light curve shows a clear secondary maximum and peaks before the B-band maximum, placing SN 2015bp in the transitional category of SNe Ia. The spectral evolution of SN 2015bp resembles other transitional SNe Ia rather than 1991bg-like events. The C ii λ6580 feature is detected in both SN 2015bp and iPTF13ebh, though it is present till the epoch of B-band maximum in the case of SN 2015bp. The velocity gradients of Si ii λ6355 place SN 2015bp and iPTF13ebh in the FAINT subclass, whereas pseudo-equivalent widths of Si ii features place them in the Cool (CL) subclass of SNe Ia. The bolometric light curve of SN 2015bp indicates that ∼0.2 M⊙ of 56Ni was synthesized in the explosion, with a total ejected mass of ∼0.9 M⊙, suggesting a sub-Chandrasekhar mass white dwarf progenitor.
Description: Restricted Access
ISSN: 1365-2966
???metadata.dc.rights???: © Royal Astronomical Society
Appears in Collections:Publications based on data from IAO, Hanle
IIAP Publications

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