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Date and Time of the Query: 2019-06-26 T13:48:09 PDT
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For refcode 1992AJ....104.1156L:
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Copyright by American Astronomical Society. Reproduced by permission
1992AJ....104.1156L 0.9-1.35 MICRON SPECTRA OF FIVE TYPE Ia SUPERNOVAE NEAR MAXIMUM LIGHT DAVID K. LYNCH, PETER ERWIN, RICHARD J. RUDY, GEORGE S. ROSSANO, AND R. C. PUETTER Space and Environment Technology Center, The Aerospace Corporation, P.O. Box 92957, Los Angeles, California 90009 Received 27 AprIl 1992; revised 28 May 1992 ABSTRACT We report near-infrared (0.9-1.35 micron) spectra of type Ia supernovae 1989B, 1989M, 1990M, 1990N, and 1991T obtained 22, 12, 15, -5, and 0 days, respectively, after maximum B brightness. The only spectral feature that we can identify is the Ca II infrared triplet. Two spectra taken after B maximum (1989B and 1989M) showed the unidentified J-band absorption, though with varying shapes and depths. Two spectra taken at, and before MAXIMA do not show the absorption. The dereddened slopes of the continua between 0.9 and 1.35 microns exceed that of a Rayleigh-Jeans continuum (F is proportional to {lambda}^-4^) for all but one SN. From our data and from optical observations, it appears that the Ca II IR absorption lines first appear at about the time of B maximum. This suggests that the physical conditions necessary for their formation may also be connected with the formation of the J-band absorption. Although there are some similarities, the near-IR spectra of type Ia supernovae are not homogeneous. It is nonetheless, possible that their spectra change with time in a repeatable manner, or that they are a homogeneous class of objects but appear different when viewed at different angles relative to their orbital planes.
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