On the origin of the 1.2-μm feature in type la supernova spectra

Jason Spyromilio, Philip A. Pinto, Ronald G. Eastman

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


The infrared colour evolution of type la supernovae is very uniform, exhibiting a dip in the J-H light curve approximately 30 d after maximum light. Spectroscopically, this dip has been identified with what appears as a broad absorption feature (5 x 104 km s-1) at 1.2 μm. Although many candidate transitions have been investigated in the past, no plausible species of ion or molecule has been found that can account for an absorption at this wavelength. We suggest that this 'absorption' is in fact a lack of emission caused by the absence of any significant opacity in this wavelength interval. At this epoch the supernova is merely a broad-line nebula with no lines near 1.2 μm.

Original languageEnglish (US)
Pages (from-to)L17-L19
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
StatePublished - 1991


  • Infrared: Stars
  • Line: identification
  • Supernovae: Individual: SN 199IT

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'On the origin of the 1.2-μm feature in type la supernova spectra'. Together they form a unique fingerprint.

Cite this