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Optical and Near-Infrared Observations of the Peculiar Type ia Supernova 1999ac
2006
Astronomical Journal
We present 39 nights of optical photometry, 34 nights of infrared photometry, and 4 nights of optical spectroscopy of the Type Ia SN 1999ac. This supernova was discovered two weeks before maximum light, and observations were begun shortly thereafter. At early times its spectra resembled the unusual SN 1999aa and were characterized by very high velocities in the Ca II H and K lines, but very low velocities in the Si II 6355 A line. The optical photometry showed a slow rise to peak brightness
doi:10.1086/503108
fatcat:ykhfxk2b7bhspnyzdjbqgu6jwy