OPTICAL SPECTROSCOPY OF TYPE Ia SUPERNOVAE

Matheson, T.; Kirshner, R.; Challis, Peter; Jha, Saurabh W.; Garnavich, P.; Berlind, P.; Calkins, M. L.; Blondin, S.; Balog, Z.; Bragg, Ann; Caldwell, Nelson; Concannon, Kristi Dendy; Falco, E.; Graves, Genevieve J.; Huchra, J. P.; Kuraszkiewicz, Joanna; Mader, J.; Mahdavi, Andisheh; Phelps, M.; Rines, Kenneth J.; Song, Inseok; Wilkes, B. J.

doi:10.1088/0004-6256/135/4/1598

Cited by 129 publications

(163 citation statements)

References 82 publications

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“…The Las Campanas 6.5 m telescope image 4 of SN2001hh, a normal type II SN (Matheson et al 2001), shows it on the inner edge of a southern spiral arm, thus supporting our claim.…”

Section: Maps-ngp O_442_2131626 Van Densupporting

confidence: 82%

Early-type galaxies with core collapse supernovae

Hakobyan¹,

Петросян²,

McLean

et al. 2008

A&A

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Aims. It is widely accepted that the progenitors of core collapse SNe are young massive stars and therefore their host galaxies are mostly spiral or irregular galaxies dominated by a young stellar population. Surprisingly, among morphologically classified hosts of core collapse SNe, we find 22 cases where the host has been classified as an Elliptical or S0 galaxy. Methods. To clarify this apparent contradiction, we carry out a detailed morphological study and an extensive literature search for additional information on the sample objects. Results. Our results are as follows: 1. Of 22 "early type" objects, 17 are in fact misclassified spiral galaxies, one is a misclassified irregular, and one is a misclassified ring galaxy. 2. Of the 3 objects maintaining the early type classification, one (NGC 2768) is a suspected merger remnant, another (NGC 4589) is definitely a merger, and the third (NGC 2274) is in close interaction. The presence of some amount of young stellar population in these galaxies is therefore not unexpected. Conclusions. These results confirm the presence of a limited, but significant, number of core collapse SNe in galaxies generally classified as early-type. In all cases, anyway, there are independent indicators of the presence in host galaxies of recent star formation due to merging or gravitational interaction.

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“…The Las Campanas 6.5 m telescope image 4 of SN2001hh, a normal type II SN (Matheson et al 2001), shows it on the inner edge of a southern spiral arm, thus supporting our claim.…”

Section: Maps-ngp O_442_2131626 Van Densupporting

confidence: 82%

Early-type galaxies with core collapse supernovae

Hakobyan¹,

Петросян²,

McLean

et al. 2008

A&A

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“…A best fit to the combined data of SN 1991bg, 1999by and 2005ke gives a velocity gradientv = 106 ± 9 km s −1 day −1 . SN 1998de displays higher velocities in the pre-maximum epochs, while a month past maximum light it falls very close to (Turatto et al 1996), 1998de (Modjaz et al 2001;Matheson et al 2008), 1999by (Vinko et al 2001Howell et al 2001), and 2005bl (Taubenberger et al 2008). The dashed line is a best fit to the data after excluding SN1998de.…”

Section: General Properties Of Sn 2005kementioning

confidence: 93%

VLT Spectropolarimetry of the Type Ia SN 2005ke

Patat¹,

Hoêflich²,

Baade³

et al. 2012

A&A

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Aims. In this study we try to answer the question whether or not subluminous Type Ia supernovae have additional distinctive properties when examined from the point of view of the explosion geometry. Methods. We have performed optical spectropolarimetric observations of the Type Ia SN 2005ke at 3 epochs (days −8, −7, and +76). The explosion properties are derived by comparing the data to explosion and radiation transfer models. Results. The supernova shows polarimetric properties that are very similar to the only other subluminous event for which spectropolarimetry is available, i.e. SN 1999by. The data present a very marked dominant axis, which is shared by both the continuum and lines such as Si ii λ6355, suggesting that the relatively large, global asymmetry is common to the photosphere and the line-forming region. The maximum polarization degree observed in the Si ii λ6355 absorption reaches 0.39 ± 0.08%. At variance with what is seen in core-normal Type Ia, SN 2005ke displays significant continuum polarization, which grows from the blue to the red and peaks at about 7000 Å, reaching ∼0.7%. The properties of the polarization and flux spectra can be understood within the framework of a subluminous delayed-detonation (DD), or pulsating DD scenario, or white dwarf (WD) mergers. The difference in appearance with respect to core-normal SNe Ia is caused by low photospheric temperatures in combination with layers of unburned C, and more massive layers of the products of explosive C and O burning. The comparatively high level of continuum polarization is explained in terms of a significant global asymmetry (∼15%), which is well reproduced by an oblate ellipsoidal geometry within the general context of a DD explosion. Conclusions. Our results suggest that SN 2005ke arose either from a single-degenerate system in which the WD is especially rapidly rotating, close to the break-up velocity, or from a double-degenerate merger. Based on the current polarization data, we cannot distinguish between these two possibilities. Possible tests are discussed.

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“…After the formative and exceptionally well-characterised SN 1991T, a number of objects with very similar photometric and spectroscopic properties have been described in the literature. These include SN 1997br (Li et al, 1999), SNe 1998ab, 1999dq (Jha et al, 2006;Matheson et al, 2008), LSQ12gdj (Scalzo et al, 2014a) and several SNe from the Nearby Supernova Factory (Scalzo et al, 2012;Taubenberger et al, 2013b). Since SN 1991T itself is still the best-observed of its kind, the following discussion is focused on it, before transitional 99aa-like and rare 00cx-like SNe are presented in Sections 2.5 and 2.6.…”

Section: T-like Sne: Spectroscopically Distinctmentioning

confidence: 99%

“…SN 1991bg became the prototype of a whole class of objects, some of which have properties nearly identical to SN 1991bg, while others seem to bridge the gap to normal SNe Ia, and again others deviate in certain respects and are sometimes even more extreme than SN 1991bg itself. In the following we will first focus on SN 1991bg and its close twins, which include SNe 1997cn (Turatto et al, 1998;Jha et al, 2006), 1998de (Modjaz et al, 2001;Jha et al, 2006;Matheson et al, 2008), 1999by Vinkó et al, 2001;Höflich et al, 2002;Garnavich et al, 2004;Silverman et al, 2012), 2005bl (Taubenberger et al, 2008, 2005ke (Hicken et al, 2009;Contreras et al, 2010;Blondin et al, 2012;Silverman et al, 2012;Patat et al, 2012), 2006bz (Hicken et al, 2009), and several other examples contained in the SN Ia samples of Hicken et al (2009), Contreras et al (2010, Ganeshalingam et al (2010), Stritzinger et al (2011), Blondin et al (2012 and Silverman et al (2012). In Sections 3.6 and 3.7 we will then discuss transitional 86G-like objects and the very subluminous and peculiar transient PTF 09dav, respectively.…”

Section: Bg-like Sne: Cool and Subluminousmentioning

confidence: 99%

“…With a better handle on the extinction towards SN 1986G (Hough et al, 1987;Phillips et al, 1999), it has become clear that the SN is indeed intrinsically unusual, and seems to be a transitional object between normal and 91bg-like SNe. 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: 99%

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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 SPECTROSCOPY OF TYPE Ia SUPERNOVAE

Cited by 129 publications

References 82 publications

Early-type galaxies with core collapse supernovae

Early-type galaxies with core collapse supernovae

VLT Spectropolarimetry of the Type Ia SN 2005ke

The Extremes of Thermonuclear Supernovae

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