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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…
The Type Ia Supernova 1998bu in M96 and the Hubble Constant
S. Jha, P. Garnavich, R. Kirshner +39
We present optical and near-infrared photometry and spectroscopy of the type Ia SN 1998bu in the Leo I Group galaxy M96 (NGC 3368). The data set consists of 356 photometric measure…
A Black Hole in the X-Ray Nova Velorum 1993
A. V. Filippenko, D. C. Leonard, T. Matheson +3
We have obtained 17 moderate-resolution (~2.5 A) optical spectra of the Galactic X-ray Nova Velorum 1993 in quiescence with the Keck-II telescope. The orbital period (P) is 0.28520…