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Discovery of an Unusual Optical Transient with the Hubble Space Telescope
K. Barbary, K. S. Dawson, K. Tokita +27
We present observations of SCP 06F6, an unusual optical transient discovered during the Hubble Space Telescope Cluster Supernova Survey. The transient brightened over a period of ~…
Improved Cosmological Constraints from New, Old and Combined Supernova Datasets
M. Kowalski, D. Rubin, G. Aldering +67
We present a new compilation of Type Ia supernovae (SNe Ia), a new dataset of low-redshift nearby-Hubble-flow SNe and new analysis procedures to work with these heterogeneous compi…
How to Find More Supernovae with Less Work: Object Classification Techniques for Difference Imaging
S. Bailey, C. Aragon, R. Romano +3
We present the results of applying new object classification techniques to difference images in the context of the Nearby Supernova Factory supernova search. Most current supernova…
Quantitative comparison between Type Ia supernova spectra at low and high redshifts: A case study
G. Garavini, G. Folatelli, S. Nobili +44
We develop a method to measure the strength of the absorption features in Type Ia supernova (SN Ia) spectra and use it to make a quantitative comparison between the spectra of Type…
Nearby Supernova Factory Observations of SN 2006D: On Sporadic Carbon Signatures in Early Type Ia Supernova Spectra
The Nearby Supernova Factory, :, R. C. Thomas +27
We present four spectra of the Type Ia supernova (SN Ia) 2006D extending from -7 to +13 days with respect to B-band maximum. The spectra include the strongest signature of unburned…
Nearby Supernova Factory Observations of SN 2005gj: Another Type Ia Supernova in a Massive Circumstellar Envelope
The Nearby Supernova Factory Collaboration, G. Aldering, P. Antilogus +24
We report Nearby Supernova Factory observations of SN 2005gj, the second confirmed case of a "hybrid" Type Ia/IIn supernova. Our early-phase photometry of SN 2005gj shows that the…
Time Dependent Monte Carlo Radiative Transfer Calculations For 3-Dimensional Supernova Spectra, Lightcurves, and Polarization
Daniel Kasen, R. C. Thomas, Peter Nugent
We discuss Monte-Carlo techniques for addressing the 3-dimensional time-dependent radiative transfer problem in rapidly expanding supernova atmospheres. The transfer code SEDONA ha…
Measurement of Ω_m, Ω_Λ from a blind analysis of Type Ia supernovae with CMAGIC: Using color information to verify the acceleration of the Universe
A. Conley, G. Goldhaber, L. Wang +26
We present measurements of Ω_m and Ω_Λ from a blind analysis of 21 high-redshift supernovae using a new technique (CMAGIC) for fitting the multi-color lightcurves of Type Ia supern…
Spectra of High-Redshift Type Ia Supernovae and a Comparison with their Low-Redshift Counterparts
I. M. Hook, D. A. Howell, G. Aldering +32
We present spectra for 14 high-redshift (0.17 < z < 0.83) supernovae, which were discovered by the Supernova Cosmology Project as part of a campaign to measure cosmological paramet…
Spectroscopic Observations and Analysis of the Unusual Type Ia SN 1999ac
The Supernova Cosmology Project, :, G. Garavini +55
We present optical spectra of the peculiar Type Ia supernova (SN Ia) 1999ac. The data extend from -15 to +42 days with respect to B-band maximum and reveal an event that is unusual…
Restframe I-band Hubble diagram for type Ia supernovae up to redshift z ~0.5
The Supernova Cosmology Project, :, S. Nobili +35
We present a novel technique for fitting restframe I-band light curves on a data set of 42 Type Ia supernovae (SNe Ia). Using the result of the fit, we construct a Hubble diagram w…
Reading the Spectra of the Most Peculiar Type Ia Supernova 2002cx
David Branch, E. Baron, R. C. Thomas +3
In spite of the apparent lack of Si II and S II features in its spectra, SN 2002cx was classified as a peculiar Type Ia supernova (SN Ia) on the basis of its overall photometric an…
Direct Analysis of Spectra of the Peculiar Type Ia Supernova 2000cx
D. Branch, R. C. Thomas, E. Baron +6
The Type Ia SN 2000cx exhibited multiple peculiarities, including a lopsided B-band light-curve peak that does not conform to current methods for using shapes of light curves to st…
Could There Be A Hole In Type Ia Supernovae?
Daniel Kasen, Peter Nugent, R. C. Thomas +1
In the favored progenitor scenario, Type Ia supernovae arise from a white dwarf accreting material from a non-degenerate companion star. Soon after the white dwarf explodes, the ej…
Synthetic Spectrum Methods for Three-Dimensional Supernova Models
R. C. Thomas
Current observations stimulate the production of fully three-dimensional explosion models, which in turn motivates three-dimensional spectrum synthesis for supernova atmospheres. W…
Optical Spectra of the Type Ia Supernova 1998aq
D. Branch, P. Garnavich, T. Matheson +6
We present 29 optical spectra of the normal Type Ia SN 1998aq, ranging from 9 days before to 241 days after the time of maximum brightness. This spectroscopic data set, together wi…
On the Geometry of the High-Velocity Ejecta of the Peculiar Type Ia Supernova 2000cx
R. C. Thomas, David Branch, E. Baron +3
High-velocity features in Type Ia supernova spectra provide a way to probe the outer layers of these explosions. The maximum-light spectra of the unique Type Ia supernova 2000cx ex…
The Spectrum of the FeLoBAL Quasar FBQS 1214+2803: A Resonance-Scattering Interpretation
D. Branch, K. M. Leighly, R. C. Thomas +1
The usual interpetation of the spectrum of a BAL QSO is that a broad-band continuum from the central engine plus broad emission lines from a surrounding region (the BELR) emerges f…
A Comparative Study of the Absolute-Magnitude Distributions of Supernovae
Dean Richardson, David Branch, Darrin Casebeer +3
The Asiago Supernova Catalog is used to carry out a comparative study of supernova absolute-magnitude distributions. An overview of the absolute magnitudes of the supernovae in the…
Spectral Consequences of Deviation from Spherical Composition Symmetry in Type Ia Supernovae
R. C. Thomas, Daniel Kasen, David Branch +1
We investigate the prospects for constraining the maximum scale of clumping in composition that is consistent with observed Type Ia supernova flux spectra. Synthetic spectra genera…
Distance-Redshift in Inhomogeneous Friedmann-Lemaitre-Robertson-Walker Cosmology
R. Kantowski, R. C. Thomas
Distance--redshift relations are given in terms of associated Legendre functions for partially filled beam observations inspatially flat Friedmann-Lemaitre-Robertson-Walker (FLRW)…
The Age-Redshift Relation for Standard Cosmology
R. C. Thomas, R. Kantowski
We present compact, analytic expressions for the age-redshift relation for standard Friedmann-Lema\^ \itre-Robertson-Walker (FLRW) cosmology. The new expressions are given i…
Distance-Redshift in Inhomogeneous FLRW
R. Kantowski, J. K. Kao, R. C. Thomas
We give distance--redshift relations in terms of elliptic integrals for three different mass distributions of the Friedmann-Lema\^ıtre-Robertson-Walker (FLRW) cosmology. These mode…