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Supernova 2012ec : identification of the progenitor and early monitoring with PESSTO

Maund, J. R. (author)
Fraser, M. (author)
Smartt, S. J. (author)
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Botticella, M. T. (author)
Barbarino, C. (author)
Childress, M. (author)
Gal-Yam, A. (author)
Inserra, C. (author)
Pignata, G. (author)
Reichart, D. (author)
Schmidt, B. (author)
Sollerman, Jesper (author)
Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
Taddia, Francesco (author)
Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
Tomasella, L. (author)
Valenti, S. (author)
Yaron, O. (author)
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 (creator_code:org_t)
2013-03-07
2013
English.
In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966 .- 1745-3933 .- 1745-3925. ; 431:1, s. l102-L106
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • We present the identification of the progenitor of the Type IIP SN 2012ec in archival pre-explosion Hubble Space Telescope Wide Field Planetary Camera 2 (WFPC2) and Advanced Camera for Surveys Wide Field Channel F814W images. The properties of the progenitor are further constrained by non-detections in pre-explosion WFPC2 F450W and F606W images. We report a series of early photometric and spectroscopic observations of SN 2012ec. The r' -band light curve shows a plateau with M-r' = -17.0. The early spectrum is similar to the Type IIP SN 1999em, with the expansion velocity measured at Ha absorption minimum of -11 700 km s(-1) (at 1 d post-discovery). The photometric and spectroscopic evolution of SN 2012ec shows it to be a Type IIP SN, discovered only a few days post-explosion (<6 d). We derive a luminosity for the progenitor, in comparison with MARCS model spectral energy distributions, of log L/L-circle dot = 5.15 +/- 0.19, from which we infer an initial mass range of 14-22M(circle dot). This is the first SN with an identified progenitor to be followed by the Public ESO Spectroscopic Survey of Transient Objects (PESSTO).

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

supernovae: general
supernovae: individual: 2012ec
galaxies: individual: NGC 1084

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ref (subject category)
art (subject category)

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