Spectroscopic Observations and Analysis of the Peculiar SN 1999aa

Garavini, G.; Folatelli, G.; Goobar, A.; Nobili, S.; Aldering, G.; Amadon, Alexis; Amanullah, R.; Astier, P.; Balland, C.; Blanc, G.; Burns, M. S.; Conley, A.; Dahlén, T.; Deustua, Susana E.; Ellis, Richard S.; Fabbro, S.; Fan, Xiaohui; Frye, Brenda; Gates, E. L.; Gibbons, R.; Goldhaber, G.; Goldman, B.; Groom, D. E.; Haïssinski, J.; Hardin, D.; Hook, I. M.; Howell, D. A.; Kasen, Daniel; Kent, Stephen M.; Kim, A. G.; Knop, R. A.; Lee, B. C.; Lidman, C.; Méndez, J.; Miller, G. Edward; Moniez, M.; Mourão, A.; Newberg, Heidi Jo; Nugent, P.; Pain, R.; Perdereau, O.; Perlmutter, S.; Prasad, Vinod; Quimby, R.; Raux, J.; Regnault, Nicolas; Rich, Jeffrey A.; Richards, Gordon T.; 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.

doi:10.1086/421747

Cited by 108 publications

(98 citation statements)

References 88 publications

(140 reference statements)

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“…The SYNOW fit of SN 2008ha is similar to those of the −1 and −5 days spectra of SNe 2002cx (Branch et al 2004) (Phillips et al 2007), SN 1999aa, a slightly over-luminous SN Ia (Garavini et al 2004), SN 2006gz, a luminous SN Ia with C features in its pre-maximum spectra (Hicken et al 2007), SN 2004aw, a SN Ic that was originally classified as a SN Ia (its true nature was only realized with nebular spectra; Taubenberger et al 2006), and SN 2007gr, a well-observed SN Ic with a spectrum somewhat similar to SN 2004aw (Valenti et al 2008). The maximum-light spectrum of SN 2008ha is generally similar to all five comparison spectra after correcting for velocity differences.…”

Section: Maximum-light Spectrumsupporting

confidence: 70%

EARLY- AND LATE-TIME OBSERVATIONS OF SN 2008ha: ADDITIONAL CONSTRAINTS FOR THE PROGENITOR AND EXPLOSION

Foley

Brown

Rest

et al. 2009

ApJ

143

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We present a new maximum-light optical spectrum of the extremely low luminosity and exceptionally low-energy Type Ia supernova (SN Ia) 2008ha, obtained one week before the earliest published spectrum. Previous observations of SN 2008ha were unable to distinguish between a massive star and white dwarf (WD) origin for the SN. The new maximum-light spectrum, obtained one week before the earliest previously published spectrum, unambiguously shows features corresponding to intermediate mass elements, including silicon, sulfur, and carbon. Although strong silicon features are seen in some core-collapse SNe, sulfur features, which are a signature of carbon/ oxygen burning, have always been observed to be weak in such events. It is therefore likely that SN 2008ha was the result of a thermonuclear explosion of a carbon-oxygen WD. Carbon features at maximum light show that unburned material is present to significant depths in the SN ejecta, strengthening the case that SN 2008ha was a failed deflagration. We also present late-time imaging and spectroscopy that are consistent with this scenario.

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Section: Maximum-light Spectrumsupporting

confidence: 70%

EARLY- AND LATE-TIME OBSERVATIONS OF SN 2008ha: ADDITIONAL CONSTRAINTS FOR THE PROGENITOR AND EXPLOSION

Foley

Brown

Rest

et al. 2009

ApJ

143

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“…We have identified two SN Ia in our sample showing strong similarities with the spectra of SN 1999aa (Garavini et al 2004) (see Fig. 5).…”

Section: Peculiar Sn Iasupporting

confidence: 57%

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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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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“…Our SN templates are from Peter Nugent's spectral library 50 (see Nugent et al 2002, and the SUSPECT database; 51 1954A, 1962L, 1964L, 1990B, 1990I, 1994I, 1998bw, 1999ex, 2000H, 2002ap II 1948B, 1959D, 1961F, 1961I, 1961V, 1964F, 1964H, 1969L, 1970A, 1986E II 1987A, 1988A, 1988H, 1988Z, 1989C, 1990ae, 1990ag, 1990E, 1990H, 1990K II 1990Q, 1990V, 1990X, 1991C, 1991H, 1991J, 1992aa, 1992ab, 1992C, 1992H II 1993J, 1994aj, 1996L, 1997ab, 1997cy, 1997D, 1998dn, 1998S, 1999em, 2004dj Ia-pec 1957A, 1960H, 1986G, 1991bg, 1991bj, 1991F, 1991T, 1997br, 1997cn, 1999aa Ia-pec 1999ac, 1999by, 2000cx Nugent's Branch-normal (Branch et al 1993), SN 1991T-like (e.g., Filippenko et al 1992a), and SN 1991bg-like (e.g., Filippenko et al 1992b) templates (supplemented by spectra of some peculiar SNe Ia (e.g., SN 1999aa, Garavini et al 2004;SN 1999by, Garnavich et al 2004 from SUSPECT. For SNe Ib/c, the templates used are Nugent's normal SN Ib/c and hypernova spectra, as well as observed spectra of SN 1990B (Matheson et al 2001), SN 1990I (Elmhamdi et al 2004), SN 1994I (Clocchiatti et al 1996), SN 1998bw (Ferdinando et al 2001), SN 1999ex (Hamuy et al 2002), SN 2000H (Branch et al 2002), and SN 2002ap (Gal-Yam et al 2002, from the SUSPECT database).…”

Section: Cross-correlation Analysismentioning

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 Observations and Analysis of the Peculiar SN 1999aa

Cited by 108 publications

References 88 publications

EARLY- AND LATE-TIME OBSERVATIONS OF SN 2008ha: ADDITIONAL CONSTRAINTS FOR THE PROGENITOR AND EXPLOSION

EARLY- AND LATE-TIME OBSERVATIONS OF SN 2008ha: ADDITIONAL CONSTRAINTS FOR THE PROGENITOR AND EXPLOSION

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

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

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