Optical spectroscopy of type Ia supernovae

Creators: Matheson, T.; Kirshner, R. P.; Challis, P.; Jha, S.; Garnavich, P. M.; Berlind, P.; Calkins, M. L.; Blondin, S.; Balog, Z.; Bragg, A. E.; Caldwell, N.; Concannon, K. Dendy; Falco, E. E.; Graves, G. J. M.; Huchra, J. P.; Kuraszkiewicz, J.; Mader, J. A.; Mahdavi, A.; Phelps, M.; Rines, K.; Song, I.; Wilkes, B. J.

Abstract

We present 432 low-dispersion optical spectra of 32 Type Ia supernovae (SNe Ia) that also have well-calibrated light curves. The coverage ranges from 6 epochs to 36 epochs of spectroscopy. Most of the data were obtained with the 1.5 m Tillinghast telescope at the F. L. Whipple Observatory with typical wavelength coverage of 3700-7400 Å and a resolution of ~7 Å. The earliest spectra are 13 days before B-band maximum; two-thirds of the SNe were observed before maximum brightness. Coverage for some SNe continues almost to the nebular phase. The consistency of the method of observation and the technique of reduction makes this an ideal data set for studying the spectroscopic diversity of SNe Ia.

Additional Information

© 2008 The American Astronomical Society. Received 2007 August 28; accepted 2007 December 26; published 2008 March 13. We would like to thank the staffs of the F. L. Whipple and MMT Observatories for their extensive assistance and support during this project. We would also like to thank Dan Koranyi and Barbara Carter for providing assistance with the observations. The CfA time allocation committee has been extremely generous in supporting SN observations at FLWO, especially in allowing the day-by-day monitoring of so many SNe. This research was supported in part by the National Science Foundation under Grant No. PHY05-51164 to the KITP and AST-0606772 to Harvard University.

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