A sample of Type II-L supernovae

T. Faran*, D. Poznanski, A. V. Filippenko, R. Chornock, R. J. Foley, M. Ganeshalingam, D. C. Leonard, W. Li, M. Modjaz, F. J.D. Serduke, J. M. Silverman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

What are Type II-Linear supernovae (SNe II-L)? This class, which has been ill defined for decades, now receives significant attention - both theoretically, in order to understand what happens to stars in the ~15-25 M range, and observationally, with two independent studies suggesting that they cannot be cleanly separated photometrically from the regular hydrogenrich SNe II-P characterized by a marked plateau in their light curve. Here, we analyse the multiband light curves and extensive spectroscopic coverage of a sample of 35 SNe II and find that 11 of them could be SNe II-L. The spectra of these SNe are hydrogen deficient, typically have shallow Hα absorption, may show indirect signs of helium via strong O I λ7774 absorption, and have faster line velocities consistent with a thin hydrogen shell. The light curves can be mostly differentiated from those of the regular, hydrogen-rich SNe II-P by their steeper decline rates and higher luminosity, and we propose to define them based on their decline in the V band: SNe II-L decline by more than 0.5 mag from peak brightness by day 50 after explosion. Using our sample we provide template light curves for SNe II-L and II-P in four photometric bands.

Original languageEnglish (US)
Pages (from-to)554-569
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume445
Issue number1
DOIs
StatePublished - Oct 8 2014
Externally publishedYes

Keywords

  • General
  • Supernovae

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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