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Very Early Ultraviolet And Optical Observations Of The Type Ia Supernova 2009ig, Ryan J. Foley, P. J. Challis, A. V. Filippenko, M. Ganeshalingam, W. Landsman, W. Li, G. H. Marion, J. M. Silverman, R. L. Beaton, V. N. Bennert, S. B. Cenko, M. Childress, P. Guhathakurta, L. Jiang, J. S. Kalirai, R. P. Kirshner, A. Stockton, E. J. Tollerud, J. Vinkó, J. C. Wheeler, J.-H. Woo
Very Early Ultraviolet And Optical Observations Of The Type Ia Supernova 2009ig, Ryan J. Foley, P. J. Challis, A. V. Filippenko, M. Ganeshalingam, W. Landsman, W. Li, G. H. Marion, J. M. Silverman, R. L. Beaton, V. N. Bennert, S. B. Cenko, M. Childress, P. Guhathakurta, L. Jiang, J. S. Kalirai, R. P. Kirshner, A. Stockton, E. J. Tollerud, J. Vinkó, J. C. Wheeler, J.-H. Woo
Physics
Supernova (SN) 2009ig was discovered 17 hr after explosion by the Lick Observatory Supernova Search, promptly classified as a normal Type Ia SN (SN Ia), peaked at V = 13.5 mag, and was equatorial, making it one of the foremost SNe for intensive study in the last decade. Here, we present ultraviolet (UV) and optical observations of SN 2009ig, starting about 1 day after explosion until around maximum brightness. Our data include excellent UV and optical light curves, 25 premaximum optical spectra, and 8 UV spectra, including the earliest UV spectrum ever obtained of an SN Ia. SN 2009ig is …