Comparison of progenitor mass estimates for the type IIP SN 2012A

L. Tomasella, E. Cappellaro, M. Fraser, M. L. Pumo, A. Pastorello, G. Pignata, S. Benetti, F. Bufano, M. Dennefeld, A. Harutyunyan, T. Iijima, A. Jerkstrand, E. Kankare, R. Kotak, L. Magill, V. Nascimbeni, P. Ochner, A. Siviero, S. Smartt, J. SollermanV. Stanishev, F. Taddia, S. Taubenberger, M. Turatto, S. Valenti, D. E. Wright, L. Zampieri

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We present the one-year long observing campaign of SN 2012A which exploded in the nearby (9.8 Mpc) irregular galaxy NGC 3239. The photometric evolution is that of a normal type IIP supernova. The absolute maximum magnitude, with MB = -16.23 +- 0.16 mag. SN2012A reached a peak luminosity of about 2X10**42 erg/s, which is brighter than those of other SNe with a similar 56Ni mass. The latter was estimated from the luminosity in the exponential tail of the light curve and found to be M(56Ni) = 0.011 +-0.004 Msun. The spectral evolution of SN 2012A is also typical of SN IIP, from the early spectra dominated by a blue continuum and very broad (~10**4 km/s) Balmer lines, to the late-photospheric spectra characterized by prominent P-Cygni features of metal lines (Fe II, Sc II, Ba II, Ti II, Ca II, Na ID). The photospheric velocity is moderately low, ~3X10**3 km/s at 50 days, for the low optical depth metal lines. The nebular spectrum obtained 394 days after the shock breakout shows the typical features of SNe IIP and the strength of the [O I] doublet suggests a progenitor of intermediate mass, similar to SN 2004et (~15 Msun). A candidate progenitor for SN 2012A has been identified in deep, pre-explosion K'-band Gemini North (NIRI) images, and found to be consistent with a star with a bolometric magnitude -7.08+-0.36 (log L/Lsun = 4.73 +- 0.14$ dex). The magnitude of the recovered progenitor in archival images points toward a moderate-mass 10.5 (-2/+4.5) Msun star as the precursor of SN 2012A. The explosion parameters and progenitor mass were also estimated by means of a hydrodynamical model, fitting the bolometric light curve, the velocity and the temperature evolution. We found a best fit for a kinetic energy of 0.48 foe, an initial radius of 1.8X10**13 cm and ejecta mass of 12.5 Msun.
Original languageEnglish
Pages (from-to)1639-1657
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Publication statusPublished - 24 May 2013

Bibliographical note

25 pages, 17 figures. Revised version (minor revision) submitted to MNRAS 2013


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    Tomasella, L., Cappellaro, E., Fraser, M., L. Pumo, M., Pastorello, A., Pignata, G., Benetti, S., Bufano, F., Dennefeld, M., Harutyunyan, A., Iijima, T., Jerkstrand, A., Kankare, E., Kotak, R., Magill, L., Nascimbeni, V., Ochner, P., Siviero, A., Smartt, S., ... Zampieri, L. (2013). Comparison of progenitor mass estimates for the type IIP SN 2012A. Monthly Notices of the Royal Astronomical Society, 434(2), 1639-1657.