| Title: |
Supernova Legacy Survey: Using Spectral Signatures To Improve Type Ia Supernovae As Distance Indicators |
| Authors: |
Walker, E. S.; Hook, I. M.; Sullivan, M.; Howell, D. A.; Astier, P.; Balland, C.; Basa, S.; Bronder, T. J.; Carlberg, R.; Conley, A.; Fouchez, D.; Guy, J.; Hardin, D.; Pain, R.; Perrett, K.; Pritchet, C.; Regnault, N.; Rich, J.; Aldering, G.; Fakhouri, H. K.; Kronborg, T.; Palanque-Delabrouille, N.; Perlmutter, S.; Ruhlmann-Kleider, V.; Zhang, Tiantian |
| Contributors: |
Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE); Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS); Laboratoire d'Astrophysique de Marseille (LAM); Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS); Centre de Physique des Particules de Marseille (CPPM); Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS); Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU); Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)); Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA); Supernova Cosmology Project |
| Source: |
ISSN: 0035-8711. |
| Publisher Information: |
CCSD; Oxford University Press (OUP): Policy P - Oxford Open Option A |
| Publication Year: |
2010 |
| Subject Terms: |
supernovae; cosmology: observations; [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] |
| Description: |
49 pages including 2 online-only appendices, accepted for publication in MNRAS ; 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. During this time, 95 objects were observed. Where possible the objects' redshifts (z) were measured from narrow emission or absorption features in the host galaxy spectrum, otherwise they were measured from the broader supernova features. We present spectra of 68 confirmed or probable SNe Ia from SNLS with redshifts in the range 0.17 \leq z \leq 1.02. In combination with earlier SNLS Gemini and VLT spectra, we used these new observations to measure pseudo-equivalent widths (EWs) of three spectral features - CaII H&K, SiII and MgII - in 144 objects and compared them to the EWs of low-redshift SNe Ia from a sample drawn from the literature. No signs of changes with z are seen for the CaII H&K and MgII features. Systematically lower EW SiII is seen at high redshift, but this can be explained by a change in demographics of the SNe Ia population within a two-component model combined with an observed correlation between EW SiII and photometric lightcurve stretch. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
info:eu-repo/semantics/altIdentifier/arxiv/1008.2308; ARXIV: 1008.2308 |
| DOI: |
10.1111/j.1365-2966.2011.19210.x |
| Availability: |
https://in2p3.hal.science/in2p3-00516646; https://doi.org/10.1111/j.1365-2966.2011.19210.x |
| Accession Number: |
edsbas.2B43DBBF |
| Database: |
BASE |