487 citations · 11.9k across the 114 of their papers we have counts for
6 papers · 1 filter
Hubble Space Telescope and Ground-Based Observations of Type Ia Supernovae at Redshift 0.5: Cosmological Implications
A. Clocchiatti, B. Schmidt, A. Filippenko +26
We present observations of the Type Ia supernovae (SNe) 1999M, 1999N, 1999Q, 1999S, and 1999U, at redshift z~0.5. They were discovered in early 1999 with the 4.0~m Blanco telescope…
The afterglow and elliptical host galaxy of the short gamma-ray burst GRB 050724
E. Berger, P. A. Price, S. B. Cenko +21
Despite a rich phenomenology, gamma-ray bursts (GRBs) are divided into two classes based on their duration and spectral hardness -- the long-soft and the short-hard bursts. The dis…
Evidence for Spectropolarimetric Diversity in Type Ia Supernovae
Douglas C. Leonard, Weidong Li, Alexei V. Filippenko +2
We present single-epoch, post-maximum spectropolarimetry of four Type Ia supernovae (SNe Ia) that span a range of spectral and photometric properties: SN 2002bf and SN 2004dt exhib…
Interstellar Polarization and the Position Angle Orientations of Seyfert 1 Galaxies
Jennifer L. Hoffman, Ryan Chornock, Douglas C. Leonard +1
We comment on recent spectropolarimetric studies that compare the observed polarization position angles (PAs) of Seyfert 1 galaxies near H alpha with the observed orientations of t…
A Definitive Measurement of Time Dilation in the Spectral Evolution of the Moderate-Redshift Type Ia Supernova 1997ex
R. J. Foley, A. V. Filippenko, D. C. Leonard +3
We have obtained high-quality Keck optical spectra at three epochs of the Type Ia supernova 1997ex, whose redshift z is 0.361. The elapsed calendar time between the first two spect…
An HST Search for Supernovae Accompanying X-ray Flashes
A. M. Soderberg, S. R. Kulkarni, D. B. Fox +24
We present the results from an Hubble Space Telescope/ACS search for supernovae associated with X-ray flashes 020903, 040701, 040812 and 040916. We find strong evidence that XRF 02…