On the progenitor of the type IIP SN 2013ej in M74

Morgan Fraser*, Justyn R. Maund, Stephen J. Smartt, Rubina Kotak, Andy Lawrence, Alastair Bruce, Stefano Valenti, Fang Yuan, Stefano Benetti, Ting-Wan Chen, Avishay Gal-Yam, Cosimo Inserra, David R. Young

*Corresponding author for this work

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Abstract

We use natural seeing imaging of SN 2013ej in M74 to identify a progenitor candidate in archival Hubble Space Telescope (HST) + Advanced Camera for Survey images. We find a source coincident with the supernova (SN) in the F814W filter within the total 75 mas (~3 pc astrometric uncertainty; however, the position of the progenitor candidate in contemporaneous F435W and F555W filters is significantly offset. We conclude that the 'progenitor candidate' is in fact two physically unrelated sources; a blue source which is likely unrelated to the SN, and a red source which we suggest exploded as SN 2013ej. Deep images with the same instrument on board HST taken when the SN has faded (in approximately two year's time) will allow us to accurately characterize the unrelated neighbouring source and hence determine the intrinsic flux of the progenitor in three filters.We suggest that the F814W flux is dominated by the progenitor of SN 2013ej, and assuming a bolometric correction appropriate to an M-type supergiant, we estimate that the mass of the progenitor of SN 2013ej was between 8 and 15.5M⊙. 

Original languageEnglish
Pages (from-to)L56-L60
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume439
Issue number1
Early online date30 Dec 2013
DOIs
Publication statusPublished - 21 Mar 2014

Keywords

  • Galaxies: Individual: NGC 628
  • Stars: Massive
  • Supernovae: General
  • Supernovae: Individual: SN 2013ej

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Fraser, M., Maund, J. R., Smartt, S. J., Kotak, R., Lawrence, A., Bruce, A., Valenti, S., Yuan, F., Benetti, S., Chen, T-W., Gal-Yam, A., Inserra, C., & Young, D. R. (2014). On the progenitor of the type IIP SN 2013ej in M74. Monthly Notices of the Royal Astronomical Society: Letters, 439(1), L56-L60. https://doi.org/10.1093/mnrasl/slt179