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Probing the Geometry of Supernovae with Spectropolarimetry
Douglas C. Leonard, Alexei V. Filippenko, Thomas Matheson
We present results from a spectropolarimetric survey of young supernovae completed at the Keck Observatory, including at least one example from each of the major supernova types: I…
Polarized Narrow-Line Emission from the Nucleus of NGC 4258
A. J. Barth, H. D. Tran, M. S. Brotherton +5
The detection of polarized continuum and line emission from the nucleus of NGC 4258 by Wilkes et al. (1995) provides an intriguing application of the unified model of Seyfert nucle…
The Environments of Supernovae in Post-Refurbishment Hubble Space Telescope Images
S. D. Van Dyk, C. Y. Peng, A. J. Barth +1
The locations of supernovae in the local stellar and gaseous environment in galaxies contain important clues to their progenitor stars. Access to this information, however, has bee…
Spectral Models of the Type Ic SN 1994I in M51
E. Baron, David Branch, Peter H. Hauschildt +2
We present detailed non-local thermodynamic equilibrium (NLTE) synthetic spectra for comparison with a time series of observed optical spectra of the Type Ic supernova 1994I which…
The Risetime of Nearby Type Ia Supernovae
Adam G. Riess, Alexei V. Filippenko, Weidong Li +7
We present calibrated photometric measurements of the earliest detections of nearby type Ia supernovae (SNe Ia). The set of ~30 new, unfiltered CCD observations delineate the early…
A Preliminary Indication of Evolution of Type Ia Supernovae from their Risetimes
Adam G. Riess, Alexei V. Filippenko, Weidong Li +1
We have compared the risetime for samples of nearby and high-redshift type Ia supernovae (SNe Ia). The fiducial risetime of the nearby SNe Ia is 2.5+/-0.4 days longer than the proe…