On the nature of Type IIn/Ia-CSM supernovae

Optical and near-infrared spectra of SN 2012ca and SN 2013dn

Ori D. Fox, Jeffrey M. Silverman, Alexei V. Filippenko, Jon Mauerhan, Juliette Becker, H. Jacob Borish, S. Bradley Cenko, Kelsey I. Clubb, Melissa Graham, Eric Hsiao, Patrick L. Kelly, William H. Lee, G. H. Marion, Dan Milisavljevic, Jerod Parrent, Isaac Shivvers, Michael Skrutskie, Nathan Smith, John Wilson, Weikang Zheng

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

A growing subset of Type Ia supernovae (SNe Ia) shows evidence via narrow emission lines for unexpected interaction with a dense circumstellar medium (SNe IIn/Ia-CSM). The precise nature of the progenitor, however, remains debated owing to spectral ambiguities arising from a strong contribution from the CSM interaction. Late-time spectra offer potential insight if the post-shock cold, dense shell becomes sufficiently thin and/or the ejecta begin to cross the reverse shock. To date, only a few high-quality spectra of this kind exist. Here we report on the late-time optical and infrared spectra of the SNe Ia-CSM 2012ca and 2013dn. These SNe Ia-CSM spectra exhibit low [Fe III]/[Fe II] ratios and strong [Ca II] at late epochs. Such characteristics are reminiscent of the super-Chandrasekhar-mass candidate SN 2009dc, for which these features suggested a low-ionization state due to high densities, although the broad Fe features admittedly show similarities to the blue 'quasi-continuum' observed in some core collapse SNe Ibn and IIn. Neither SN 2012ca nor any of the other SNe Ia-CSM in this paper show evidence for broad oxygen, carbon, or magnesium in their spectra. Similar to the interacting Type IIn SN 2005ip, a number of high-ionization lines are identified in SN 2012ca, including [S III], [Ar III], [Ar X], [Fe VIII], [Fe X], and possibly [Fe XI]. The total bolometric energy output does not exceed 1051 erg, but does require a large kinetic-to-radiative conversion efficiency. All of these observations taken together suggest that SNe Ia-CSM are more consistent with a thermonuclear explosion than a core collapse event, although detailed radiative transfer models are certainly necessary to confirm these results.

Original languageEnglish (US)
Pages (from-to)772-785
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume447
Issue number1
DOIs
StatePublished - Nov 20 2014

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command service modules
supernovae
near infrared
infrared spectra
ionization
thermonuclear explosions
shock
ejecta
erg
radiative transfer
explosion
magnesium
ambiguity
set theory
optical spectrum
shell
kinetics
oxygen
time measurement
interactions

Keywords

  • Circumstellar matter
  • Ssupernovae: individual: SN 2013dn
  • Supernovae: general
  • Supernovae: individual: SN 2005ip
  • Supernovae: individual: SN 2009dc
  • Supernovae: individual: SN 2012ca

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Fox, O. D., Silverman, J. M., Filippenko, A. V., Mauerhan, J., Becker, J., Jacob Borish, H., ... Zheng, W. (2014). On the nature of Type IIn/Ia-CSM supernovae: Optical and near-infrared spectra of SN 2012ca and SN 2013dn. Monthly Notices of the Royal Astronomical Society, 447(1), 772-785. https://doi.org/10.1093/mnras/stu2435

On the nature of Type IIn/Ia-CSM supernovae : Optical and near-infrared spectra of SN 2012ca and SN 2013dn. / Fox, Ori D.; Silverman, Jeffrey M.; Filippenko, Alexei V.; Mauerhan, Jon; Becker, Juliette; Jacob Borish, H.; Bradley Cenko, S.; Clubb, Kelsey I.; Graham, Melissa; Hsiao, Eric; Kelly, Patrick L.; Lee, William H.; Marion, G. H.; Milisavljevic, Dan; Parrent, Jerod; Shivvers, Isaac; Skrutskie, Michael; Smith, Nathan; Wilson, John; Zheng, Weikang.

In: Monthly Notices of the Royal Astronomical Society, Vol. 447, No. 1, 20.11.2014, p. 772-785.

Research output: Contribution to journalArticle

Fox, OD, Silverman, JM, Filippenko, AV, Mauerhan, J, Becker, J, Jacob Borish, H, Bradley Cenko, S, Clubb, KI, Graham, M, Hsiao, E, Kelly, PL, Lee, WH, Marion, GH, Milisavljevic, D, Parrent, J, Shivvers, I, Skrutskie, M, Smith, N, Wilson, J & Zheng, W 2014, 'On the nature of Type IIn/Ia-CSM supernovae: Optical and near-infrared spectra of SN 2012ca and SN 2013dn', Monthly Notices of the Royal Astronomical Society, vol. 447, no. 1, pp. 772-785. https://doi.org/10.1093/mnras/stu2435
Fox, Ori D. ; Silverman, Jeffrey M. ; Filippenko, Alexei V. ; Mauerhan, Jon ; Becker, Juliette ; Jacob Borish, H. ; Bradley Cenko, S. ; Clubb, Kelsey I. ; Graham, Melissa ; Hsiao, Eric ; Kelly, Patrick L. ; Lee, William H. ; Marion, G. H. ; Milisavljevic, Dan ; Parrent, Jerod ; Shivvers, Isaac ; Skrutskie, Michael ; Smith, Nathan ; Wilson, John ; Zheng, Weikang. / On the nature of Type IIn/Ia-CSM supernovae : Optical and near-infrared spectra of SN 2012ca and SN 2013dn. In: Monthly Notices of the Royal Astronomical Society. 2014 ; Vol. 447, No. 1. pp. 772-785.
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AU - Mauerhan, Jon

AU - Becker, Juliette

AU - Jacob Borish, H.

AU - Bradley Cenko, S.

AU - Clubb, Kelsey I.

AU - Graham, Melissa

AU - Hsiao, Eric

AU - Kelly, Patrick L.

AU - Lee, William H.

AU - Marion, G. H.

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