SN 2004A: Another Type II-P supernova with a red supergiant progenitor

M. A. Hendry, S. J. Smartt, R. M. Crockett, J. R. Maund, A. Gal-Yam, D. S. Moon, S. B. Cenko, D. W. Fox, R. P. Kudritzki, C. R. Benn, R. Østensen

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63 Scopus citations


We present a monitoring study of SN 2004A and probable discovery of a progenitor star in pre-explosion Hubble Space Telescope (HST) images. The photometric and spectroscopic monitoring of SN 2004A show that it was a normal Type II-P which was discovered in NGC 6207 about two weeks after explosion. We compare SN 2004A to the similar Type II-P SN 1999em and estimate an explosion epoch of 2004 January 6. We also calculate three new distances to NGC 6207 of and . The former was calculated using the Standard Candle Method (SCM) for SNe II-P, and the latter two from the brightest supergiants method (BSM). We combine these three distances with existing kinematic distances, to derive a mean value of . Using this distance, we estimate that the ejected nickel mass in the explosion is . The progenitor of SN 2004A is identified in pre-explosion WFPC2 F814W images with a magnitude of , but is below the detection limit of the F606W images. We show that this was likely a red supergiant (RSG) with a mass of . The object is detected at 4.7σ above the background noise. Even if this detection is spurious, the 5σ upper limit would give a robust upper mass limit of for a RSG progenitor. These initial masses are very similar to those of two previously identified RSG progenitors of the Type II-P SNe 2004gd (8 -2+4 M) and 2005cs (9-2 +3 M).

Original languageEnglish (US)
Pages (from-to)1303-1320
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
StatePublished - Jul 2006

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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