The ESO/VLT 3rd year Type Ia supernova data set from the supernova legacy survey

被引：53

作者：

Balland, C. ^{[1
,2
,3
,4
]}

Baumont, S. ^{[1
,2
,3
]}

Basa, S. ^{[5
]}

Mouchet, M. ^{[6
,7
]}

Howell, D. A. ^{[8
,9
]}

Astier, P. ^{[1
,2
,3
]}

Carlberg, R. G. ^{[10
]}

Conley, A. ^{[10
]}

Fouchez, D. ^{[11
]}

Guy, J. ^{[1
,2
,3
]}

Hardin, D. ^{[1
,2
,3
]}

Hook, I. M. ^{[12
]}

Pain, R. ^{[1
,2
,3
]}

Perrett, K. ^{[10
]}

Pritchet, C. J. ^{[13
]}

Regnault, N. ^{[1
,2
,3
]}

Rich, J. ^{[14
]}

Sullivan, M. ^{[12
]}

Antilogus, P. ^{[1
,2
,3
]}

Arsenijevic, V. ^{[16
,17
,18
]}

Le Du, J. ^{[11
]}

Fabbro, S. ^{[17
,18
]}

Lidman, C. ^{[15
]}

Mourao, A. ^{[17
,18
]}

Palanque-Delabrouille, N. ^{[14
]}

Pecontal, E. ^{[19
,20
,21
]}

Ruhlmann-Kleider, V. ^{[14
]}

机构：

[1] LPNHE, CNRS, IN2P3, F-75252 Paris 05, France

[2] Univ Paris 06, F-75252 Paris 05, France

[3] Univ Paris 07, F-75252 Paris 05, France

[4] Univ Paris 11, F-91405 Orsay, France

[5] CNRS, LAM, F-13388 Marseille 13, France

[6] CNRS, APC, UMR 7164, F-75205 Paris 13, France

[7] Observ Paris, Sect Meudon, CNRS, LUTH,UMR 8102, F-92195 Meudon, France

[8] Las Cumbres Observ Global Telescope Network, Goleta, CA 93117 USA

[9] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[10] Dept Astron & Astrophys, Toronto, ON M5S 3H4, Canada

[11] CNRS Marseille Luminy, CPPM, F-13288 Marseille 9, France

[12] Univ Oxford, Oxford OX1 3RH, England

[13] Univ Victoria, Dept Phys & Astron, Victoria, BC V8W 3P6, Canada

[14] CEA Saclay, DSM Irfu Spp, F-91191 Gif Sur Yvette, France

[15] Oskar Klein Ctr, S-10691 Stockholm, Sweden

[16] Univ Lisbon, Fac Ciencias, SIM IDL, P-1749016 Lisbon, Portugal

[17] IST, Dept Phys, Lisbon, Portugal

[18] IST, CENTRA Ctr M Astrofis, Lisbon, Portugal

[19] Univ Lyon 1, F-69622 Villeurbanne, France

[20] Univ Lyon, F-69622 Lyon, France

[21] ENS Lyon, Observ Lyon, CNRS, CRAL,UMR 5574, Lyon, France

来源：

ASTRONOMY & ASTROPHYSICS | 2009年 / 507卷 / 01期

关键词：

cosmology: observations; supernovae: general; methods: data analysis; techniques: spectroscopic; HIGH-REDSHIFT SUPERNOVAE; SPECTROSCOPIC OBSERVATIONS; EVOLUTION; SPECTRA; CONSTRAINTS; ULTRAVIOLET; SELECTION; GALAXIES; MODEL;

D O I：

10.1051/0004-6361/200912246

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. We present 139 spectra of 124 Type Ia supernovae (SNe Ia) that were observed at the ESO/VLT during the first three years of the Canada-France-Hawa Telescope (CFHT) supernova legacy survey (SNLS). This homogeneous data set is used to test for redshift evolution of SN Ia spectra, and will be used in the SNLS 3rd year cosmological analyses. Methods. Spectra have been reduced and extracted with a dedicated pipeline that uses photometric information from deep CFHT legacy survey (CFHT-LS) reference images to trace, at sub-pixel accuracy, the position of the supernova on the spectrogram as a function of wavelength. It also separates the supernova and its host light in similar to 60% of cases. The identification of the supernova candidates is performed using a spectrophotometric SN Ia model. Results. A total of 124 SNe Ia, roughly 50% of the overall SNLS spectroscopic sample, have been identified using the ESO/VLT during the first three years of the survey. Their redshifts range from z = 0.149 to z = 1.031. The average redshift of the sample is z = 0.63 +/- 0.02. This constitutes the largest SN Ia spectral set to date in this redshift range. The spectra are presented along with their best-fit spectral SN Ia model and a host model where relevant. In the latter case, a host subtracted spectrum is also presented. We produce average spectra for pre-maximum, maximum and post-maximum epochs for both z < 0.5 and z >= 0.5 SNe Ia. We find that z < 0.5 spectra have deeper intermediate mass element absorptions than z = 0.5 spectra. The differences with redshift are consistent with the selection of brighter and bluer supernovae at higher redshift.

引用

页码：85 / U176

页数：66

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