Publications (31)
The effect of progenitor age and metallicity on luminosity and 56Ni yield in Type Ia supernovae
D. A. Howell, M. Sullivan, E. F. Brown +23
Timmes, Brown & Truran found that metallicity variations could theoretically account for a 25% variation in the mass of 56Ni synthesized in Type Ia supernovae (SNe Ia), and thus ac…
The Type Ia Supernova Rate in Radio and Infrared Galaxies from the CFHT Supernova Legacy Survey
M. L. Graham, C. J. Pritchet, M. Sullivan +25
We have combined the large SN Ia database of the Canada-France-Hawaii Telescope Supernova Legacy Survey and catalogs of galaxies with photometric redshifts, VLA 1.4 GHz radio sourc…
Photometric redshifts for supernovae Ia in the Supernova Legacy Survey
N. Palanque-Delabrouille, V. Ruhlmann-Kleider, S. Pascal +17
We present a method using the SALT2 light curve fitter to determine the redshift of Type Ia supernovae in the Supernova Legacy Survey (SNLS) based on their photometry in g', r', i'…
SiFTO: An Empirical Method for Fitting SNe Ia Light Curves
A. Conley, M. Sullivan, E. Y. Hsiao +14
We present SiFTO, a new empirical method for modeling type Ia supernovae (SNe Ia) light curves by manipulating a spectral template. We make use of high-redshift SN observations whe…
Subluminous Type Ia Supernovae at High Redshift from the Supernova Legacy Survey
S. Gonzalez-Gaitan, K. Perrett, M. Sullivan +15
The rate evolution of subluminous Type Ia Supernovae is presented using data from the Supernova Legacy Survey. This sub-sample represents the faint and rapidly-declining light-curv…
The Rise-Time of Normal and Subluminous Type Ia Supernovae
S. Gonzalez-Gaitan, A. Conley, F. B. Bianco +21
We calculate the average stretch-corrected rise-time of type Ia supernovae (SNe Ia) in the Supernova Legacy Survey. We use the aggregate lightcurves of spectroscopic and photometri…
SNLS Spectroscopy: Testing for Evolution in Type Ia Supernovae
T. J. Bronder, I. M. Hook, P. Astier +19
Aims: We present a quantitative study of a new data set of high redshift Type Ia supernovae spectra, observed at the Gemini telescopes during the first 34 months of the Supernova L…
Supernova Legacy Survey: Using Spectral Signatures To Improve Type Ia Supernovae As Distance Indicators
E. S. Walker, I. M. Hook, M. Sullivan +22
GMOS optical long-slit spectroscopy at the Gemini-North telescope was used to classify targets from the Supernova Legacy Survey (SNLS) from July 2005 and May 2006 - May 2008. Durin…
Verifying the Cosmological Utility of Type Ia Supernovae: Implications of a Dispersion in the Ultraviolet Spectra
R. S. Ellis, M. Sullivan, P. E. Nugent +16
We analyze the mean rest-frame ultraviolet (UV) spectrum of Type Ia Supernovae (SNe Ia) and its dispersion using high signal-to-noise Keck-I/LRIS-B spectroscopy for a sample of 36…
Constraining dark matter halo properties using lensed SNLS supernovae
J. Jonsson, M. Sullivan, I. Hook +7
This paper exploits the gravitational magnification of SNe Ia to measure properties of dark matter haloes. The magnification of individual SNe Ia can be computed using observed pro…
The ESO/VLT 3rd year Type Ia supernova data set from the Supernova Legacy Survey
C. Balland, S. Baumont, S. Basa +24
We present 139 spectra of 124 Type Ia supernovae (SNeIa) that were observed at the ESO/VLT during the first three years of the Canada-France-Hawai Telescope (CFHT) Supernova Legacy…
An Efficient Approach to Obtaining Large Numbers of Distant Supernova Host Galaxy Redshifts
C. Lidman, V. Ruhlmann-Kleider, M. Sullivan +20
We use the wide-field capabilities of the 2dF fibre positioner and the AAOmega spectrograph on the Anglo-Australian Telescope (AAT) to obtain redshifts of galaxies that hosted supe…
Photometric selection of Type Ia supernovae in the Supernova Legacy Survey
G. Bazin, V. Ruhlmann-Kleider, N. Palanque-Delabrouille +23
We present a sample of 485 photometrically identified Type Ia supernova candidates mined from the first three years of data of the CFHT SuperNova Legacy Survey (SNLS). The images w…
Photometric selection of high-redshift type Ia supernovae
M. Sullivan, D. A. Howell, K. Perrett +26
We present a method for selecting high-redshift type Ia supernovae (SNe Ia) located via rolling SN searches. The technique, using both color and magnitude information of events fro…
The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda and w from the First Year Data Set
P. Astier, J. Guy, N. Regnault +39
We present distance measurements to 71 high redshift type Ia supernovae discovered during the first year of the 5-year Supernova Legacy Survey (SNLS). These events were detected an…
SALT2: using distant supernovae to improve the use of Type Ia supernovae as distance indicators
J. Guy, P. Astier, S. Baumont +22
We present an empirical model of Type Ia supernovae spectro-photometric evolution with time. The model is built using a large data set including light-curves and spectra of both ne…
The Core-collapse rate from the Supernova Legacy Survey
G. Bazin, N. Palanque-Delabrouille, J. Rich +27
We use three years of data from the Supernova Legacy Survey (SNLS) to study the general properties of core-collapse and type Ia supernovae. This is the first such study using the "…
Clustering of supernova Ia host galaxies
R. G. Carlberg, M. Sullivan, D. Le Borgne +16
For the first time the cross-correlation between type Ia supernova host galaxies and surrounding field galaxies is measured using the Supernova Legacy Survey sample. Over the z=0.2…
Rates and properties of type Ia supernovae as a function of mass and star-formation in their host galaxies
M. Sullivan, D. Le Borgne, C. J. Pritchet +27
(ABRIDGED) We show that Type Ia supernovae (SNe Ia) are formed within both very young and old stellar populations, with observed rates that depend on the stellar mass and mean star…
Gemini Spectroscopy of Supernovae from SNLS: Improving High Redshift SN Selection and Classification
D. A. Howell, M. Sullivan, K. Perrett +22
We present new techiques for improving the efficiency of supernova (SN) classification at high redshift using 64 candidates observed at Gemini North and South during the first year…
Evolution in the Volumetric Type Ia Supernova Rate from the Supernova Legacy Survey
K. Perrett, M. Sullivan, A. Conley +23
We present a measurement of the volumetric Type Ia supernova (SN Ia) rate (SNR_Ia) as a function of redshift for the first four years of data from the Canada-France-Hawaii Telescop…
The Rise Time of Type Ia Supernovae from the Supernova Legacy Survey
A. Conley, D. A. Howell, A. Howes +24
We compare the rise times of nearby and distant Type Ia supernovae (SNe Ia) as a test for evolution using 73 high-redshift spectroscopically-confirmed SNe Ia from the first two yea…
Photometric Calibration of the Supernova Legacy Survey Fields
N. Regnault, A. Conley, J. Guy +13
We present the photometric calibration of the Supernova Legacy Survey (SNLS) fields. The SNLS aims at measuring the distances to SNe Ia at (0.3<z<1) using MegaCam, the 1 deg^2 imag…
Type Ia Supernovae Rates and Galaxy Clustering from the CFHT Supernova Legacy Survey
M. L. Graham, C. J. Pritchet, M. Sullivan +25
The Canada-France-Hawaii Telescope Supernova Legacy Survey (SNLS) has created a large homogeneous database of intermediate redshift (0.2 < z < 1.0) type Ia supernovae (SNe Ia). The…
Type Ia supernova science 2010-2020
D. A. Howell, A. Conley, M. Della Valle +47
In the next decade Type Ia supernovae (SNe Ia) will be used to test theories predicting changes in the Dark Energy equation of state with time. Ultimately this requires a dedicated…
Real-time Analysis and Selection Biases in the Supernova Legacy Survey
K. Perrett, D. Balam, M. Sullivan +13
The Supernova Legacy Survey (SNLS) has produced a high-quality, homogeneous sample of Type Ia supernovae (SNe Ia) out to redshifts greater than z=1. In its first four years of full…
M31's Undisturbed Thin Disk of Globular Clusters
H. L. Morrison, P. Harding, K. Perrett +1
We show that there is a subsystem of the M31 globular clusters with THIN DISK kinematics. These clusters span the entire metallicity range of the M31 globular cluster system, in co…
Two superluminous supernovae from the early universe discovered by the Supernova Legacy Survey
D. A. Howell, D. Kasen, C. Lidman +14
We present spectra and lightcurves of SNLS 06D4eu and SNLS 07D2bv, two hydrogen-free superluminous supernovae discovered by the Supernova Legacy Survey. At z = 1.588, SNLS 06D4eu i…
Gravitational lensing in the Supernova Legacy Survey (SNLS)
T. Kronborg, D. Hardin, J. Guy +18
The observed brightness of Type Ia supernovae is affected by gravitational lensing caused by the mass distribution along the line of sight, which introduces an additional dispersio…
The Type Ia Supernova Rate at z ~0.5 from the Supernova Legacy Survey
J. D. Neill, M. Sullivan, D. Balam +33
We present a measurement of the distant Type Ia supernova rate derived from the first two years of the Canada -- France -- Hawaii Telescope Supernova Legacy Survey. We observed fou…
The Supernova Type Ia Rate Evolution with SNLS
J. D. Neill, M. Sullivan, D. Balam +36
We present a progress report on a project to derive the evolution of the volumetric supernova Type Ia rate from the Supernova Legacy Survey. Our preliminary estimate of the rate ev…