SNe 2013K and 2013am: observed and physical properties of two slow, normal Type IIP events

L. Tomasella, E. Cappellaro, M. L. Pumo, A. Jerkstrand, S. Benetti, N. Elias-Rosa, M. Fraser, C. Inserra, A. Pastorello, M. Turatto, L. Galbany, C. P. Gutiérrez, E. Kankare, G. Pignata, G. Terreran, S. Valenti, C. Barbarino, F. E. Bauer, M. T. Botticella, T.-W. ChenA. Gal-Yam, A. Harutyunyan, D. A. Howell, A. Morales Garoffolo, P. Ochner, S. J. Smartt, S. Schulze, D. R. Young, L. Zampieri

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Abstract

We present 1 yr of optical and near-infrared photometry and spectroscopy of the Type IIP SNe 2013K and 2013am. Both objects are affected by significant extinction, due to their location in dusty regions of their respective host galaxies, ESO 009-10 and NGC 3623 (M65). From the photospheric to nebular phases, these objects display spectra congruent with those of underluminous Type IIP SNe (i.e. the archetypal SNe 1997D or 2005cs), showing low photospheric velocities (˜2 × 103 km s-1 at 50 d) together with features arising from Ba II that are particularly prominent in faint SNe IIP. The peak V-band magnitudes of SN 2013K (-15.6 mag) and SN 2013am (-16.2 mag) are fainter than standard-luminosity Type IIP SNe. The ejected nickel masses are 0.012 ± 0.010 and 0.015 ± 0.006 M⊙ for SN 2013K and SN 2013am, respectively. The physical properties of the progenitors at the time of explosion are derived through hydrodynamical modelling. Fitting the bolometric curves, the expansion velocity and the temperature evolution, we infer total ejected masses of 12 and 11.5 M⊙, pre-SN radii of ˜460 and ˜360 R⊙, and explosion energies of 0.34 foe and 0.40 foe for SN 2013K and SN 2013am. Late time spectra are used to estimate the progenitor masses from the strength of nebular emission lines, which turn out to be consistent with red supergiant progenitors of ˜15 M⊙. For both SNe, a low-energy explosion of a moderate-mass red supergiant star is therefore the favoured scenario.
Original languageEnglish
Pages (from-to)1937-1959
JournalMonthly Notices of the Royal Astronomical Society
Volume475
Issue number2
Early online date13 Dec 2017
DOIs
Publication statusPublished - 01 Apr 2018

Keywords

  • supernovae: general
  • supernovae: individual: SN 2013am
  • SN 2013K
  • galaxies: individual: M 65
  • ESO 009-10

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    Tomasella, L., Cappellaro, E., Pumo, M. L., Jerkstrand, A., Benetti, S., Elias-Rosa, N., Fraser, M., Inserra, C., Pastorello, A., Turatto, M., Galbany, L., Gutiérrez, C. P., Kankare, E., Pignata, G., Terreran, G., Valenti, S., Barbarino, C., Bauer, F. E., Botticella, M. T., ... Zampieri, L. (2018). SNe 2013K and 2013am: observed and physical properties of two slow, normal Type IIP events. Monthly Notices of the Royal Astronomical Society, 475(2), 1937-1959. https://doi.org/10.1093/mnras/stx3220