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Light Curves of 213 Type Ia Supernovae from the ESSENCE Survey
Gautham Narayan, Armin Rest, Brad E. Tucker +34
The ESSENCE survey discovered 213 Type Ia supernovae at redshifts 0.1 < z < 0.81 between 2002 and 2008. We present their R and I-band photometry, measured from images obtained usin…
Distances with <4% Precision from Type Ia Supernovae in Young Star-Forming Environments
Patrick L. Kelly, Alexei V. Filippenko, David L. Burke +3
The luminosities of Type Ia supernovae (SNe), the thermonuclear explosions of white-dwarf stars, vary systematically with their intrinsic color and the rate at which they fade. Fro…
Constraints on dark energy with the LOSS SN Ia sample
Mohan Ganeshalingam, Weidong Li, Alexei V. Filippenko
We present a cosmological analysis of the Lick Observatory Supernova Search (LOSS) Type Ia supernova (SN Ia) photometry sample introduced by Ganeshalingam et al. (2010). These SNe…
High-Velocity Features in Type Ia Supernova Spectra
Michael J. Childress, Alexei V. Filippenko, Mohan Ganeshalingam +1
We use a sample of 58 low-redshift (z <= 0.03) Type Ia supernovae (SNe Ia) having well-sampled light curves and spectra near maximum light to examine the behaviour of high-velocity…
Berkeley Supernova Ia Program V: Late-Time Spectra of Type Ia Supernovae
Jeffrey M. Silverman, Mohan Ganeshalingam, Alexei V. Filippenko
In this work we analyse late-time (t > 100 d) optical spectra of low-redshift (z < 0.1) Type Ia supernovae (SNe Ia) which come mostly from the Berkeley Supernova Ia Program dataset…
The Very Young Type Ia Supernova 2012cg: Discovery and Early-Time Follow-Up Observations
Jeffrey M. Silverman, Mohan Ganeshalingam, S. Bradley Cenko +15
On 2012 May 17.2 UT, only 1.5 +/- 0.2 d after explosion, we discovered SN 2012cg, a Type Ia supernova (SN Ia) in NGC 4424 (d ~ 15 Mpc). As a result of the newly modified strategy e…
The Low-Velocity, Rapidly Fading Type Ia Supernova 2002es
Mohan Ganeshalingam, Weidong Li, Alexei V. Filippenko +8
SN 2002es is a peculiar subluminous Type Ia supernova (SN Ia) with a combination of observed characteristics never before seen in a SN Ia. At maximum light, SN 2002es shares spectr…
Berkeley Supernova Ia Program III: Spectra Near Maximum Brightness Improve the Accuracy of Derived Distances to Type Ia Supernovae
Jeffrey M. Silverman, Mohan Ganeshalingam, Weidong Li +1
In this third paper in a series we compare spectral feature measurements to photometric properties of 108 low-redshift (z < 0.1) Type Ia supernovae (SNe Ia) with optical spectra wi…
Berkeley Supernova Ia Program I: Observations, Data Reduction, and Spectroscopic Sample of 582 Low-Redshift Type Ia Supernovae
Jeffrey M. Silverman, Ryan J. Foley, Alexei V. Filippenko +37
In this first paper in a series we present 1298 low-redshift (z\leq0.2) optical spectra of 582 Type Ia supernovae (SNe Ia) observed from 1989 through 2008 as part of the Berkeley S…
Constraints on the Progenitor System of the Type Ia Supernova SN 2011fe/PTF11kly
Weidong Li, Joshua S. Bloom, Philipp Podsiadlowski +25
Type Ia supernovae (SNe) serve as a fundamental pillar of modern cosmology, owing to their large luminosity and a well-defined relationship between light-curve shape and peak brigh…
The Rise-Time Distribution of Nearby Type Ia Supernovae
Mohan Ganeshalingam, Weidong Li, Alexei V. Filippenko
We present an analysis of the B-band and V-band rise-time distributions of nearby Type Ia supernovae (SNe Ia). We use a two-stretch template-fitting method to measure the rise and…
The Most Slowly Declining Type Ia Supernova 2001ay
Kevin Krisciunas, Weidong Li, Thomas Matheson +28
We present optical and near-infrared photometry, as well as ground-based optical spectra and Hubble Space Telescope ultraviolet spectra, of the Type Ia supernova (SN) 2001ay. At ma…
Broad-Line Reverberation in the Kepler-Field Seyfert Galaxy Zw 229-015
A. J. Barth, M. L. Nguyen, M. A. Malkan +45
The Seyfert 1 galaxy Zw 229-015 is among the brightest active galaxies being monitored by the Kepler mission. In order to determine the black hole mass in Zw 229-015 from H-beta re…
Peculiar Type II Supernovae from Blue Supergiants
Io K. W. Kleiser, Dovi Poznanski, Daniel Kasen +10
The vast majority of Type II supernovae (SNe) are produced by red supergiants (RSGs), but SN 1987A revealed that blue supergiants (BSGs) can produce members of this class as well,…
Near-Ultraviolet Properties of a Large Sample of Type Ia Supernovae as Observed with the Swift UVOT
Peter A. Milne, Peter J. Brown, Peter W. A. Roming +15
We present ultraviolet (UV) and optical photometry of 26 Type Ia supernovae (SNe~Ia) observed from March 2005 to March 2008 with the NASA {\it Swift} Ultraviolet and Optical Telesc…
The Lick AGN Monitoring Project: Reverberation Mapping of Optical Hydrogen and Helium Recombination Lines
Misty C. Bentz, Jonelle L. Walsh, Aaron J. Barth +23
We have recently completed a 64-night spectroscopic monitoring campaign at the Lick Observatory 3-m Shane telescope with the aim of measuring the masses of the black holes in 12 ne…
The Lick AGN Monitoring Project: Broad-Line Region Radii and Black Hole Masses from Reverberation Mapping of Hbeta
Misty C. Bentz, Jonelle L. Walsh, Aaron J. Barth +24
We have recently completed a 64-night spectroscopic monitoring campaign at the Lick Observatory 3-m Shane telescope with the aim of measuring the masses of the black holes in 12 ne…
Improved Distances to Type Ia Supernovae with Two Spectroscopic Subclasses
Xiaofeng Wang, A. V. Filippenko, M. Ganeshalingam +10
We study the observables of 158 relatively normal Type Ia supernovae (SNe Ia) by dividing them into two groups in terms of the expansion velocity inferred from the absorption minim…
Optical Spectroscopy of the Somewhat Peculiar Type IIb Supernova 2001ig
Jeffrey M. Silverman, Paolo Mazzali, Ryan Chornock +5
Here we present previously unpublished optical spectra of supernova (SN) 2001ig, a Type IIb SN, from about a week after explosion until nearly one year later. The earliest spectrum…
SN 2008ha: An Extremely Low Luminosity and Extremely Low Energy Supernova
Ryan J. Foley, Ryan Chornock, Alexei V. Filippenko +9
We present ultraviolet, optical, and near-infrared photometry as well as optical spectra of the peculiar supernova (SN) 2008ha. SN 2008ha had a very low peak luminosity, reaching o…