The fast declining type Ia supernova 2003gs, and evidence for a significant dispersion in near-infrared absolute magnitudes of fast decliners at maximum light

Kevin Krisciunas, G. H. Marion, Nicholas B. Suntzeff, Guillaume Blanc, Filomena Bufano, Pablo Candia, Regis Cartier, Nancy Elias-Rosa, Juan Espinoza, David Gonzalez, Luis Gonzalez, Sergio Gonzalez, Samuel D. Gooding, Mario Hamuy, Ethan A. Knox, Peter A. Milne, Nidia Morrell, Mark M. Phillips, Maximilian Stritzinger, Joanna Thomas-Osip

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

We obtained optical photometry of SN 2003gs on 49 nights, from 2 to 494 days after T(B max). We also obtained near-IR photometry on 21 nights. SN 2003gs was the first fast declining Type Ia SN that has been well observed since SN 1999by. While it was subluminous in optical bands compared to more slowly declining Type Ia SNe, it was not subluminous at maximum light in the near-IR bands. There appears to be a bimodal distribution in the near-IR absolute magnitudes of Type Ia SNe at maximum light. Those that peak in the near-IR after T(B max) are subluminous in the all bands. Those that peak in the near-IR prior to T(B max), such as SN 2003gs, have effectively the same near-IR absolute magnitudes at maximum light regardless of the decline rate Δm 15(B). Near-IR spectral evidence suggests that opacities in the outer layers of SN 2003gs are reduced much earlier than for normal Type Ia SNe. That may allow γrays that power the luminosity to escape more rapidly and accelerate the decline rate. This conclusion is consistent with the photometric behavior of SN2003gs in the IR, which indicates a faster than normal decline from approximately normal peak brightness.

Original languageEnglish (US)
Pages (from-to)1584-1596
Number of pages13
JournalAstronomical Journal
Volume138
Issue number6
DOIs
StatePublished - 2009

Keywords

  • supernovae: individual (SN 2003gs)
  • techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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