Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21812708m&link_type=abstract
American Astronomical Society, AAS Meeting #218, #127.08; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We investigate the behavior of high-velocity (HV) Ca II absorption features in spectra of Type Ia supernovae (SNe Ia). HV features are found at velocities that are several thousand kilometers per second greater than typical photospheric (PS) velocities. We present data obtained between -14d and +1d and explore similarities and differences in the velocities and line profiles for features from the Ca II H&K lines and the Ca II Infrared Triplet (IR3). The evolution of HV Ca II is revealed in spectral series obtained from individual SNe Ia and these data are compared to spectra from more than 20 additional SNe Ia. HV Ca II appears in nearly all spectra obtained earlier than -5d, but we demonstrate that there are exceptions in which HV features are not detected. We also explore diversity in HV Ca II features from SNe Ia observed at the same epochs and the behavior of HV Ca II is compared to that of other spectral features and to light curve parameters.
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