Kevin Krisciunas et al. 2009 The Astronomical Journal 138 1584 doi:10.1088/0004-6256/138/6/1584
Kevin Krisciunas1,2, G. H. Marion1,3, Nicholas B. Suntzeff1,2, Guillaume Blanc4, Filomena Bufano5, Pablo Candia6, Regis Cartier7, Nancy Elias-Rosa8, Juan Espinoza9, David Gonzalez9, Luis Gonzalez10, Sergio Gonzalez10, Samuel D. Gooding1, Mario Hamuy7, Ethan A. Knox11, Peter A. Milne12, Nidia Morrell10, Mark M. Phillips10, Maximilian Stritzinger10 and Joanna Thomas-Osip10
Show affiliationsWe 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.
Issue 6 (2009 December)
Received 2009 June 10, accepted for publication 2009 September 19
Published 2009 October 27
Kevin Krisciunas et al. 2009 The Astronomical Journal 138 1584
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