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    An optical and near-infrared study of the Type Ia/IIn Supernova PS15si

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    Author
    Kilpatrick, Charles D.
    Andrews, Jennifer E.
    Smith, Nathan
    Milne, P. A. cc
    Rieke, George H. cc
    Zheng, WeiKang
    Filippenko, Alexei V.
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2016-11-21
    Keywords
    circumstellar matter
    supernovae: general
    supernovae: individual: PS15si
    
    Metadata
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    Publisher
    OXFORD UNIV PRESS
    Citation
    An optical and near-infrared study of the Type Ia/IIn Supernova PS15si 2016, 463 (1):1088 Monthly Notices of the Royal Astronomical Society
    Journal
    Monthly Notices of the Royal Astronomical Society
    Rights
    © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We present optical/near-infrared spectroscopy and photometry of the supernova (SN) PS15si. This object was originally identified as a Type IIn SN, but here we argue that it should be reclassified as a Type Ia SN with narrow hydrogen lines originating from interaction with circumstellar matter (CSM; i.e. SN Ia/IIn or SN Ia-CSM). Based on deep non-detections 27 d before discovery, we infer that this SN was discovered around or slightly before optical maximum, and we estimate the approximate time that it reached R-band maximum based on comparison with other SNe Ia/IIn. In terms of spectral morphology, we find that PS15si can be matched to a range of SN Ia spectral types, although SN 1991T-like SNe Ia provides the most self-consistent match. While this spectral classification agrees with analysis of most other SNe Ia/IIn, we find that the implied CSM-interaction luminosity is too low. We infer that the similarity between PS15si and the hot, overluminous, high-ionization spectrum of SN 1991T is a consequence of a spectrum that originates in ejecta layers that are heated by ultraviolet/X-ray radiation from CSM interaction. In addition, PS15si may have rebrightened over a short time-scale in the B and V bands around 85 d after discovery, perhaps indicating that the SN ejecta are interacting with a local enhancement in CSM produced by clumps or a shell at large radii.
    ISSN
    0035-8711
    1365-2966
    DOI
    10.1093/mnras/stw2061
    Version
    Final published version
    Sponsors
    W. M. Keck Foundation; ESO programmes [188.D-3003, 191.D-0935]; NASA [NNX12AR65G, NNX14AM74G]; NASA by JPL/Caltech [1255094]; NSF [AST-1312221, AST-1515559, AST-1211916]; Gary & Cynthia Bengier; Richard & Rhoda Goldman Fund; Christopher R. Redlich Fund; TABASGO Foundation
    Additional Links
    https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw2061
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stw2061
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