Spectroscopic confirmation of high-redshift supernovae with the ESO VLT

Lidman, C.; Howell, D. A.; Folatelli, G.; Garavini, G.; Nobili, S.; Aldering, G.; Amanullah, R.; Antilogus, P.; Astier, P.; Blanc, G.; Burns, M. S.; Conley, A.; Deustua, Susana E.; Doi, Mamoru; Ellis, Richard S.; Fabbro, S.; Fadeyev, V.; Gibbons, R.; Goldhaber, G.; Goobar, A.; Groom, D. E.; Hook, I. M.; Kashikawa, Nobunari; Kim, A. G.; Knop, R. A.; Lee, B. C.; Méndez, J.; Morokuma, Tomoki; Motohara, Kentaro; Nugent, P.; Pain, R.; Perlmutter, S.; Prasad, Vinod; Quimby, R.; Raux, J.; Regnault, Nicolas; Ruiz‐Lapuente, P.; Sainton, G.; Schaefer, Bradley E.; Schahmanèche, K.; Smith, E.; Spadafora, A. L.; Stanishev, V.; Walton, N. A.; Wang, L.; Wood‐Vasey, W. M.; Yasuda, Naoki

doi:10.1051/0004-6361:20041504

Cited by 34 publications

(61 citation statements)

References 24 publications

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“…In recent years, various large-scale SN programs have published sets of SN Ia spectra at intermediate (Balland et al 2006(Balland et al , 2007Zheng et al 2008;Foley et al 2008b) and distant Lidman et al 2005;Matheson et al 2008;Bronder et al 2008;Ellis et al 2008;Foley et al 2008a) redshifts. The SNLS VLT SN Ia spectral data set presented in this paper supplements these existing sets with 124 new SNe Ia, or probable SNe Ia.…”

Section: Discussionmentioning

confidence: 99%

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

Balland

Baumont²,

Basa

et al. 2009

A&A

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104

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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-Hawaï 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 ∼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.

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Section: Discussionmentioning

confidence: 99%

“…We classify candidate spectra into six categories adapted from the classification of Lidman et al (2005). We define SN Ia (certain SNe Ia), SN Ia (probable SNe Ia but other types, in particular SNe Ic, can not be excluded given the S /N or the phase of the spectrum), SN Ia_pec (peculiar SNe Ia), SN?…”

Section: Sn Classificationmentioning

confidence: 99%

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

Balland

Baumont²,

Basa

et al. 2009

A&A

Self Cite

104

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“…Thus, an observer would see the smooth spectrum of a hot blackbody, likely superimposed on the spectrum of a blue host galaxy, and probably classify the event as an early, overluminous SN II. Several examples matching this description are shown in Lidman et al (2005). At later times, when the classical SN Ia features are apparent, the diluting affects of the CSM emission could be mistaken for host galaxy light, e.g., from a starburst, resulting in an SN Ia classification (for descriptions of the standard spectral classification techniques applied at high redshift see Lidman et al 2005;Hook et al 2005).…”

Section: Progenitor Modelsmentioning

confidence: 94%

Nearby Supernova Factory Observations of SN 2005gj: Another Type Ia Supernova in a Massive Circumstellar Envelope

Aldering

Antilogus

Bailey

et al. 2006

ApJ

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260

272

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We report Nearby Supernova Factory observations of SN 2005g j, the second confirmed case of a ''hybrid'' Type Ia/IIn supernova, which we interpret as the explosion of a white dwarf interacting with a circumstellar medium. Our early-phase photometry of SN 2005gj shows that the interaction is much stronger than for the prototype, SN 2002ic. Our first spectrum shows a hot continuum with broad and narrow H emission. Later spectra, spanning over 4 months from outburst, show clear Type Ia features combined with broad and narrow H , H , H , and He i kk5876, 7065 in emission. At higher resolution, P Cygni profiles are apparent. Surprisingly, we also observe an inverted P Cygni profile for [O iii] k5007. We find that the light curve and measured velocity of the unshocked circumstellar material imply mass loss as recently as 8 years ago. The early light curve is well described by a flat radial density profile for the circumstellar material. However, our decomposition of the spectra into Type Ia and shock emission components allows for little obscuration of the supernova, suggesting an aspherical or clumpy distribution for the circumstellar material. We suggest that the emission-line velocity profiles arise from electron scattering rather than the kinematics of the shock. This is supported by the inferred high densities and the lack of evidence for evolution in the line widths. Ground-and spacebased photometry and Keck spectroscopy of the host galaxy are used to ascertain that the host galaxy has low metallicity (Z /Z < 0:3; 95% confidence) and that this galaxy is undergoing a significant star formation event that began roughly 200 AE 70 Myr ago. We discuss the implications of these observations for progenitor models and cosmology using Type Ia supernovae.

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“…One method (Madgwick et al 2003) projects the observed spectrum onto the Karhunen-Loève (KL) transformation or PCA eigenspectra basis (Connolly et al 1995;Folkes et al 1996;Madgwick et al 2002) to extract the reconstructed source (e.g., galaxy) spectrum. Other techniques use point-source deconvolution (Blondin et al 2005) or χ 2 template-fitting techniques (Howell et al 2002(Howell et al , 2005Lidman et al 2005;Hook et al 2005), modeling both SN and galaxy with template libraries. However, this latter approach sometimes fails, yielding only a low-S/N detection of the SN spectrum.…”

Section: Spectral Decomposition and Host-galaxy Subtractionmentioning

confidence: 99%

First-Year Spectroscopy for the Sloan Digital Sky Survey-Ii Supernova Survey

Zheng¹,

Romani²,

Šako³

et al. 2008

The Astronomical Journal

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This paper presents spectroscopy of supernovae (SNe) discovered in the first season of the Sloan Digital Sky Survey-II SN Survey. This program searches for and measures multi-band light curves of SNe in the redshift range z = 0.05-0.4, complementing existing surveys at lower and higher redshifts. Our goal is to better characterize the SN population, with a particular focus on SNe Ia, improving their utility as cosmological distance indicators and as probes of dark energy. Our SN spectroscopy program features rapid-response observations using telescopes of a range of apertures, and provides confirmation of the SN and host-galaxy types as well as precise redshifts. 1766No. 5, 2008 SDSS-II SN SURVEY SPECTROSCOPY 1767We describe here the target identification and prioritization, data reduction, redshift measurement, and classification of 129 SNe Ia, 16 spectroscopically probable SNe Ia, 7 SNe Ib/c, and 11 SNe II from the first season. We also describe our efforts to measure and remove the substantial host-galaxy contamination existing in the majority of our SN spectra.

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Spectroscopic confirmation of high-redshift supernovae with the ESO VLT

Cited by 34 publications

References 24 publications

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

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

Nearby Supernova Factory Observations of SN 2005gj: Another Type Ia Supernova in a Massive Circumstellar Envelope

First-Year Spectroscopy for the Sloan Digital Sky Survey-Ii Supernova Survey

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