Optical Light Curves of the Type I[CLC]a[/CLC] Supernovae SN 1990N and SN 1991T

Lira, P.; Suntzeff, Nicholas B.; Phillips, M. M.; Hamuy, M.; Maza, J.; Schommer, R. A.; Smith, R. C.; Wells, Lisa A.; Avilés, R.; Baldwin, J. A.; Elias, J. H.; González, L.; Layden, Andrew C.; Navarrete, Mauricio; Ugarte, P.; Walker, A. R.; Williger, G. M.; Baganoff, F. K.; Crotts, Arlin; Rich, R. Michael; Tyson, Neil deGrasse; Dey, Arjun; Guhathakurta, Puragra; Hibbard, J. E.; Kim, Y.-C.; Rehner, D.; Siciliano, E. D.; Roth, Joshua; Seitzer, Patrick; Williams, T. B.

doi:10.1086/300175

Cited by 137 publications

(44 citation statements)

References 53 publications

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“…Phillips et al (1992) estimated EB À V 0:13 by assuming that the intrinsic B À V colour at maximum light was like that of normal SNe Ia. The revised photometry of Lira et al (1998) makes SN 1991T even redder than had been thought, with B max À V max 0:19 6 0:03.…”

Section: T H E L U M I N O S I T Y O F S N 1 9 9 1 Tmentioning

confidence: 99%

“…The magnitudes and luminosities of SNe 1960F, 1981B, and 1991T are compared in Table 1. The B and V peak apparent magnitudes are from Saha et al (1996b), Schaefer (1995a) and Lira et al (1998), respectively. The observed B and V magnitudes of SNe 1960F and 1991T were similar, while those of SN 1981B were about 0.5±0.6 mag fainter.…”

Section: T H E L U M I N O S I T Y O F S N 1 9 9 1 Tmentioning

confidence: 99%

“…A general discussion appears in Section 6. Filippenko et al (1992) presented optical spectra obtained from À12 to 47 d. [Thoughout this paper, epochs are in days with respect to the date of maximum light, 1991 April 28 (Phillips et al 1992;Lira et al 1998). Filippenko et al (1992) used April 26.]…”

Section: Introductionmentioning

confidence: 99%

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On the spectrum and nature of the peculiar Type Ia supernova 1991T

Fisher

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Hatano

et al. 1999

Monthly Notices of the Royal Astronomical Society

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A parametrized supernova synthetic‐spectrum code is used to study line identifications in the photospheric‐phase spectra of the peculiar Type Ia SN 1991T, and to extract some constraints on the composition structure of the ejected matter. The inferred composition structure is not like that of any hydrodynamical model for Type Ia supernovae. Evidence that SN 1991T was overluminous for a SN Ia is presented, and it is suggested that this peculiar event was probably a substantially super‐Chandrasekhar explosion that resulted from the merger of two white dwarfs.

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Section: T H E L U M I N O S I T Y O F S N 1 9 9 1 Tmentioning

confidence: 99%

Section: T H E L U M I N O S I T Y O F S N 1 9 9 1 Tmentioning

confidence: 99%

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On the spectrum and nature of the peculiar Type Ia supernova 1991T

Fisher

Branch

Hatano

et al. 1999

Monthly Notices of the Royal Astronomical Society

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“…We generate supernova light curves of Type Ia only, as they are the most luminous and hence should be the dominant contaminant in any sample. For the templates, we use R and B passband data of supernova SN 1991T from Lira et al (1998). This is an unusually bright supernova; however, our algorithm chooses a random magnitude at maximum so only the shape of the light curve is important.…”

Section: A Network To Remove the Supernovaementioning

confidence: 99%

“…Event 11 is a supernova candidate, as evidenced by the stable colour in the pre-maximum epoch, the rapid reddening at maximum, followed by the colour becoming increasingly blue. The classical supernova colour curve as depicted in Lira et al (1998) is shifted because of extinction in the host galaxy. The vertical axis is B-R in mag and the horizontal axis is time in JD 244 8000.…”

Section: Microlensing Versus Variable Starsmentioning

confidence: 99%

Light-curve classification in massive variability surveys - II. Transients towards the Large Magellanic Cloud

Belokurov

Evans

2004

Monthly Notices of the Royal Astronomical Society

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Automatic classification of variability is now possible with tools such as neural networks. Here, we present two neural networks for the identification of microlensing events: the first discriminates against variable stars and the second against supernovae. The inputs to the networks include parameters describing the shape and the size of the light curve, together with the colour of the event. The network computes the posterior probability of microlensing, together with an estimate of the likely error. An algorithm is devised for direct calculation of the microlensing rate from the output of the neural networks. We present a new analysis of the microlensing candidates towards the Large Magellanic Cloud (LMC). The neural networks confirm the microlensing nature of only seven of the possible 17 events identified by the MACHO experiment. This suggests that earlier estimates of the microlensing optical depth towards the LMC may have been overestimated. A smaller number of events is consistent with the assumption that all the microlensing events are caused by the known stellar populations in the outer Galaxy/LMC.

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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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Optical Light Curves of the Type I[CLC]a[/CLC] Supernovae SN 1990N and SN 1991T

Cited by 137 publications

References 53 publications

On the spectrum and nature of the peculiar Type Ia supernova 1991T

On the spectrum and nature of the peculiar Type Ia supernova 1991T

Light-curve classification in massive variability surveys - II. Transients towards the Large Magellanic Cloud

The Extremes of Thermonuclear Supernovae

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