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Optical and Infrared Photometry of the Type Ia Supernovae 1991T, 1991bg, 1999ek, 2001bt, 2001cn, 2001cz, and 2002bo

2004; Institute of Physics; Volume: 128; Issue: 6 Linguagem: Inglês

10.1086/425629

1538-3881

K. Krisciunas, N. B. Suntzeff, M. M. Phillips, P. Candia, J. L. Prieto, R. Antezana, R. Chassagne, Hsiao‐Wen Chen, Mark Dickinson, Peter Eisenhardt, J. Espinoza, P. Garnavich, David González, T. E. Harrison, M. Hamuy, V. D. Ivanov, W. Krzemiński, Craig Kulesa, Patrick J. McCarthy, Amaya Moro‐Martín, C. Muena, A. Noriega‐Crespo, S. E. Persson, Philip A. Pinto, Miguel Roth, Eric P. Rubenstein, S. A. Stanford, Guy S. Stringfellow, A. Zapata, Alain C. Porter, M. Wischnjewsky,

Pulsars and Gravitational Waves Research

We present optical and/or infrared photometry of the Type Ia supernovae SN 1991T, SN 1991bg, SN 1999ek, SN 2001bt, SN 2001cn, SN 2001cz, and SN 2002bo.All but one of these supernovae have decline rate parameters, Ám 15 (B), close to the median value of 1.1 for the whole class of Type Ia supernovae.The addition of these supernovae to the relationship between the near-infrared absolute magnitudes and Ám 15 (B) strengthens the previous relationships we have found in that the maximum light absolute magnitudes are essentially independent of the decline rate parameter.(SN 1991bg, the prototype of the subclass of fast-declining Type Ia supernovae, is a special case.)The dispersion in the Hubble diagram in JHK is only $0.15 mag.The near-infrared properties of Type Ia supernovae continue to be excellent measures of the luminosity distances to the supernova host galaxies because of the need for only small corrections from the epoch of observation to maximum light, low dispersion in absolute magnitudes at maximum light, and the minimal reddening effects in the near-infrared.