The Fast Declining Type Ia Supernova 2003gs, and Evidence for a Significant Dispersion in Near-Infrared Absolute Magnitudes of Fast Decliners at Maximum Light - IN2P3 - Institut national de physique nucléaire et de physique des particules
Article Dans Une Revue The Astronomical Journal Année : 2009

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

Résumé

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 γ rays that power the luminosity to escape more rapidly and accelerate the decline rate. This conclusion is consistent with the photometric behavior of SN 2003gs in the IR, which indicates a faster than normal decline from approximately normal peak brightness. Based in part on observations taken at the Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatories, which are operated by the Association of Universities for Research in Astronomy, Inc. (AURA) under cooperative agreement with the National Science Foundation. The near-IR photometry from La Silla and Paranal was obtained by the European Supernova Collaboration (ESC).

Dates et versions

in2p3-00714297 , version 1 (03-07-2012)

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Kevin Krisciunas, G. H. Marion, Nicholas B. Suntzeff, G. Blanc, Filomena Bufano, et al.. The Fast Declining Type Ia Supernova 2003gs, and Evidence for a Significant Dispersion in Near-Infrared Absolute Magnitudes of Fast Decliners at Maximum Light. The Astronomical Journal, 2009, 138, pp.1584-1596. ⟨10.1088/0004-6256/138/6/1584⟩. ⟨in2p3-00714297⟩
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