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Discovery and progenitor constraints on the Type Ia supernova 2013gy

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  • S. Holmbo
  • M. D. Stritzinger
  • B. J. Shappee, University of Hawaii
  • ,
  • M. A. Tucker, University of Hawaii
  • ,
  • W. Zheng, UC Berkeley
  • ,
  • C. Ashall, Florida State University
  • ,
  • M. M. Phillips, Las Campanas Observatory
  • ,
  • C. Contreras, Las Campanas Observatory
  • ,
  • A. V. Filippenko, UC Berkeley
  • ,
  • P. Hoeflich, Florida State University
  • ,
  • M. Huber, University of Hawaii
  • ,
  • A. L. Piro, Carnegie Observatories
  • ,
  • X. F. Wang, Tsinghua University
  • ,
  • J. J. Zhang, Chinese Academy of Sciences
  • ,
  • J. Anais, Las Campanas Observatory
  • ,
  • E. Baron, University of Oklahoma in Norman, Oklahoma, USA, Visiting Astronomer
  • ,
  • C. R. Burns, Carnegie Observatories
  • ,
  • A. Campillay, Las Campanas Observatory
  • ,
  • S. Castellón, Las Campanas Observatory
  • ,
  • C. Corco, National Optical Astronomy Observatory
  • ,
  • E. Y. Hsiao, Florida State University
  • ,
  • K. Krisciunas, Texas A and M University
  • ,
  • N. Morrell, Las Campanas Observatory
  • ,
  • M. T.B. Nielsen
  • S. E. Persson, Carnegie Observatories
  • ,
  • F. Taddia, Stockholm University
  • ,
  • L. Tomasella, INAF - Osservatorio Astronomico di Padova
  • ,
  • T. M. Zhang, National Astronomical Observatories Chinese Academy of Sciences
  • ,
  • X. L. Zhao, Tsinghua University, Tianjin University of Technology

We present an early-phase g-band light curve and visual-wavelength spectra of the normal Type Ia supernova (SN) 2013gy. The light curve is constructed by determining the appropriate S-corrections to transform KAIT natural-system B- and V-band photometry and Carnegie Supernova Project natural-system g-band photometry to the Pan-STARRS1 g-band natural photometric system. A Markov chain Monte Carlo calculation provides a best-fit single power-law function to the first ten epochs of photometry described by an exponent of 2.16+0.06-0.06 and a time of first light of MJD 56629.4+0.1-0.1, which is 1.93+0.12-0.13 days (i.e., < 48 h) before the discovery date (2013 December 4.84 UT) and -19.10+0.12-0.13 days before the time of B-band maximum (MJD 56648.5 ± 0.1). The estimate of the time of first light is consistent with the explosion time inferred from the evolution of the Si II λ6355 Doppler velocity. Furthermore, discovery photometry and previous nondetection limits enable us to constrain the companion radius down to Rc ≤ 4 R. In addition to our early-time constraints, we used a deep +235 day nebular-phase spectrum from Magellan/IMACS to place a stripped H-mass limit of < 0.018 M. Combined, these limits effectively rule out H-rich nondegenerate companions.

Original languageEnglish
Article numberA174
JournalAstronomy and Astrophysics
Volume627
IssueJuly
ISSN0004-6361
DOIs
Publication statusPublished - Jul 2019

    Research areas

  • Supernovae: general, Supernovae: individual SN 2013gy

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