SUBLUMINOUS TYPE Ia SUPERNOVAE AT HIGH REDSHIFT FROM THE SUPERNOVA LEGACY SURVEY

González–Gaitán, S.; Perrett, K.; Sullivan, M.; Conley, A.; Howell, D. A.; Carlberg, R. G.; Astier, P.; Balam, D.; Balland, C.; Basa, S.; Fouchez, D.; Guy, J.; Hardin, D.; Hook, I. M.; Pain, R.; Pritchet, C. J.; Regnault, Nicolas; Rich, J.; Lidman, C.

doi:10.1088/0004-637x/727/2/107

Cited by 45 publications

(56 citation statements)

References 104 publications

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“…No correlation between stretch and B − V colour is apparent in our sample, in agreement with previous larger studies (e.g. Brandt et al 2010;González-Gaitán et al 2011).…”

Section: Ca II Handk Velocitysupporting

confidence: 94%

“…For consistency, we have also refitted their light curves using the same version of SIFTO that is used for our low-z sample. González-Gaitán et al (2011) investigated the B − V colour-stretch relation of the SNLS SN Ia sample and found no correlation between light-curve stretch and B − V colour for 'normal' SNe Ia. We also find no correlation between stretch and B − V colour for our low-z sample.…”

Section: Constructing Mean Spectracontrasting

confidence: 54%

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Hubble Space Telescopestudies of low-redshift Type Ia supernovae: evolution with redshift and ultraviolet spectral trends

Maguire

Sullivan

Ellis

et al. 2012

Monthly Notices of the Royal Astronomical Society

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We present an analysis of the maximum light, near‐ultraviolet (NUV; 2900 < λ < 5500 Å) spectra of 32 low‐redshift (0.001 < z < 0.08) Type Ia supernovae (SNe Ia), obtained with the Hubble Space Telescope (HST) using the Space Telescope Imaging Spectrograph. We combine this spectroscopic sample with high‐quality gri light curves obtained with robotic telescopes to measure SN Ia photometric parameters, such as stretch (light‐curve width), optical colour and brightness (Hubble residual). By comparing our new data to a comparable sample of SNe Ia at intermediate redshift (0.4 < z < 0.9), we detect modest spectral evolution (3σ), in the sense that our mean low‐redshift NUV spectrum has a depressed flux compared to its intermediate‐redshift counterpart. We also see a strongly increased dispersion about the mean with decreasing wavelength, confirming the results of earlier surveys. We show that these trends are consistent with changes in metallicity as predicted by contemporary SN Ia spectral models. We also examine the properties of various NUV spectral diagnostics in the individual SN spectra. We find a general correlation between SN stretch and the velocity (or position) of many NUV spectral features. In particular, we observe that higher stretch SNe have larger Ca ii H&K velocities, which also correlate with host galaxy stellar mass. This latter trend is probably driven by the well‐established correlation between stretch and host galaxy stellar mass. We find no significant trends between UV spectral features and optical colour. Mean spectra constructed according to whether the SN has a positive or negative Hubble residual show very little difference at NUV wavelengths, indicating that the NUV evolution and variation we identify does not directly correlate with Hubble diagram residuals. Our work confirms and strengthens earlier conclusions regarding the complex behaviour of SNe Ia in the NUV spectral region, but suggests the correlations we find are more useful in constraining progenitor models rather than improving the use of SNe Ia as cosmological probes.

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“…No correlation between stretch and B − V colour is apparent in our sample, in agreement with previous larger studies (e.g. Brandt et al 2010;González-Gaitán et al 2011).…”

Section: Ca II Handk Velocitysupporting

confidence: 94%

Section: Constructing Mean Spectracontrasting

confidence: 54%

Hubble Space Telescopestudies of low-redshift Type Ia supernovae: evolution with redshift and ultraviolet spectral trends

Maguire

Sullivan

Ellis

et al. 2012

Monthly Notices of the Royal Astronomical Society

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“…Gonzalez-Gaitan et al 2011;Truran et al 2012). However, as we will demonstrate, our results suggest that the mean mass of iron ejected per SNeIa-P is lower than that produced per SNeIa-T, by a factor of ∼2.5.…”

Section: Introductionmentioning

confidence: 45%

Galactic constraints on supernova progenitor models

Acharova

Gibson

Mishurov

et al. 2013

A&A

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Aims. To estimate the mean masses of oxygen and iron ejected per each type of supernovae (SNe) event from observations of the elemental abundance patterns in the Galactic disk and constrain the relevant SNe progenitor models. Methods. We undertake a statistical analysis of the radial abundance distributions in the Galactic disk within a theoretical framework for Galactic chemical evolution which incorporates the influence of spiral arms. This framework has been shown to recover the non-linear behaviour in radial gradients, the mean masses of oxygen and iron ejected during SNe explosions to be estimated, and constraints to be placed on SNe progenitor models. Results. (i) The mean mass of oxygen ejected per core-collapse SNe (CC SNe) event (which are concentrated within spiral arms) is ∼0.27 M ; (ii) the mean mass of iron ejected by tardy Type Ia SNe (SNeIa, whose progenitors are older/longer-lived stars with ages 100 Myr and up to several Gyr, which do not concentrate within spiral arms) is ∼0.58 M ; (iii) the upper mass of iron ejected by prompt SNeIa (SNe whose progenitors are younger/shorter-lived stars with ages 100 Myr, which are concentrated within spiral arms) is ≤0.23 M per event; (iv) the corresponding mean mass of iron produced by CC SNe is ≤0.04 M per event; (v) short-lived SNe (core-collapse or prompt SNeIa) supply ∼85% of the Galactic disk's iron. Conclusions. The inferred low mean mass of oxygen ejected per CC SNe event implies a low upper mass limit for the corresponding progenitors of ∼23 M , otherwise the Galactic disk would be overabundant in oxygen. This inference is the consequence of the nonlinear dependence between the upper limit of the progenitor initial mass and the mean mass of oxygen ejected per CC SNe explosion. The low mean mass of iron ejected by prompt SNeIa, relative to the mass produced by tardy SNeIa (∼2.5 times lower), prejudices the idea that both sub-populations of SNeIa have the same physical nature. We suggest that, perhaps, prompt SNeIa are more akin to CC SNe, and discuss the implications of such a suggestion.

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“…Several other 86G-like SNe have subsequently been studied, including SN 1998bp (Jha et al, 2006;Matheson et al, 2008), SN 2003gs (Krisciunas et al, 2009;Silverman et al, 2012) and iPTF 13ebh (Hsiao et al, 2015). They appear to be at least as frequent as the more extreme 91bg-like objects (González-Gaitán et al, 2011).…”

Section: G-like Sne: Half Way Between Normal and 91bg-like Snementioning

confidence: 90%

The Extremes of Thermonuclear Supernovae

Taubenberger¹

2016

Handbook of Supernovae

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The majority of thermonuclear explosions in the Universe seem to proceed in a rather standardised way, as explosions of carbon-oxygen (CO) white dwarfs in binary systems, leading to 'normal' Type Ia supernovae (SNe Ia). However, over the years a number of objects have been found which deviate from normal SNe Ia in their observational properties, and which require different and not seldom more extreme progenitor systems. While the 'traditional' classes of peculiar SNe Ia -luminous '91T-like' and faint '91bg-like' objects -have been known since the early 1990s, other classes of even more unusual transients have only been established 20 years later, fostered by the advent of new wide-field SN surveys such as the Palomar Transient Factory. These include the faint but slowly declining '02es-like' SNe, 'Ca-rich' transients residing in the luminosity gap between classical novae and supernovae, extremely short-lived, fast-declining transients, and the very luminous so-called 'super-Chandrasekhar' SNe Ia. Not all of them are necessarily thermonuclear explosions, but there are good arguments in favour of a thermonuclear origin for most of them. The aim of this chapter is to provide an overview of the zoo of potentially thermonuclear transients, reviewing their observational characteristics and discussing possible explosion scenarios.

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SUBLUMINOUS TYPE Ia SUPERNOVAE AT HIGH REDSHIFT FROM THE SUPERNOVA LEGACY SURVEY

Cited by 45 publications

References 104 publications

Hubble Space Telescopestudies of low-redshift Type Ia supernovae: evolution with redshift and ultraviolet spectral trends

Hubble Space Telescopestudies of low-redshift Type Ia supernovae: evolution with redshift and ultraviolet spectral trends

Galactic constraints on supernova progenitor models

The Extremes of Thermonuclear Supernovae

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