The first month of evolution of the slow-rising Type IIP SN 2013ej in M74

S. Valenti*, D. Sand, A. Pastorello, M. L. Graham, D. A. Howell, J. T. Parrent, L. Tomasella, P. Ochner, M. Fraser, S. Benetti, F. Yuan, S. J. Smartt, J. R. Maund, I. Arcavi, A. Gal-Yam, C. Inserra, D. Young

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

We present early photometric and spectroscopic observations of SN 2013ej, a bright Type IIP supernova (SN) in M74. SN 2013ej is one of the closest SNe ever discovered. The available archive images and the early discovery help to constrain the nature of its progenitor. The earliest detection of this explosion was on 2013 July 24.125 UT and our spectroscopic monitoring with the FLOYDS spectrographs began on July 27.7 UT, continuing almost daily for two weeks. Daily optical photometric monitoringwas achieved with the 1mtelescopes of the Las Cumbres Observatory Global Telescope (LCOGT) network, and was complemented by UV data from Swift and near-infrared spectra from Public ESO Spectroscopic Survey of Transient Objects and Infrared Telescope Facility. The data from our monitoring campaign show that SN 2013ej experienced a 10 d rise before entering into a well-defined plateau phase. This unusually long rise time for a Type IIP has been seen previously in SN 2006bp and SN 2009bw. A relatively rare strong absorption blueward of Hα is present since our earliest spectrum. We identify this feature as Si II, rather than high-velocity Hα as sometimes reported in the literature. 

Original languageEnglish
Pages (from-to)L101-L105
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume438
Issue number1
Early online date20 Dec 2013
DOIs
Publication statusPublished - Feb 2014

Keywords

  • supernovae individual: SN 2013ej
  • Supernovae: General

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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