Theorem of Stickelberger-Voronoi

Tsvetkov, V. M.

doi:10.1007/bf02108248

Cited by 2 publications

(2 citation statements)

References 1 publication

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“…The coordinates used in this study are those reported by USC. There is a clear X-ray point-source ∼3 arcsec from the USC position which we were unable to conclusively identify and therefore cannot rule out that this 10 Both calculated from the same nuclear offsets, possibly based on Tsvetkov (1985), which may have a high uncertainty.…”

Section: Detected Post-explosion Sourcesmentioning

confidence: 88%

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Progenitor constraints for core-collapse supernovae fromChandraX-ray observations

Heikkilä

Tsygankov

Mattila

et al. 2016

Mon. Not. R. Astron. Soc.

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The progenitors of hydrogen-poor core-collapse supernovae (SNe) of types Ib, Ic and IIb are believed to have shed their outer hydrogen envelopes either by extremely strong stellar winds, characteristic of classical Wolf-Rayet stars, or by binary interaction with a close companion star. The exact nature of the progenitors and the relative importance of these processes are still open questions. One relatively unexplored method to constrain the progenitors is to search for high-mass X-ray binaries (HMXB) at SN locations in pre-explosion X-ray observations. In a HMXB, one star has already exploded as a core-collapse SN, producing a neutron star or a stellar-mass black hole. It is likely that the second star in the system will also explode as a supernova, which should cause a detectable long-term change in the system's X-ray luminosity. In particular, a pre-explosion detection of a HMXB coincident with a SN could be informative about the progenitor's nature. In this paper we analyze pre-explosion ACIS observations of 18 nearby type Ib, Ic and IIb supernovae from the Chandra X-ray observatory public archive. Two sources that could potentially be associated with the supernova are identified in the sample. Additionally we make similar post-explosion measurements for 46 SNe. Although our modelling indicates that progenitor systems with compact binary companions are probably quite rare, studies of this type can in the future provide more stringent constraints as the number of discovered nearby SNe and suitable pre-explosion X-ray data are both increasing.

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Section: Detected Post-explosion Sourcesmentioning

confidence: 88%

“…Both calculated from the same nuclear offsets, possibly based onTsvetkov (1985), which may have a high uncertainty.…”

mentioning

confidence: 99%

Progenitor constraints for core-collapse supernovae fromChandraX-ray observations

Heikkilä

Tsygankov

Mattila

et al. 2016

Mon. Not. R. Astron. Soc.

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The Diversity of Type Ia Supernovae: Evidence for Systematics?

Benetti

Cappellaro

Mazzali

et al. 2005

ApJ

379

690

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The photometric and spectroscopic properties of 26 well-observed Type Ia Supernovae (SNe Ia) were analyzed with the aim of exploring SN Ia diversity. The sample includes ( Branch) normal SNe, as well as extreme events such as SN 1991T and SN 1991bg, while the truly peculiar SNe Ia, SN 2000cx and SN 2002cx, are not included in our sample. A statistical treatment reveals the existence of three different groups. The first group ( FAINT) consists of faint SNe Ia similar to SN 1991bg, with low expansion velocities and rapid evolution of Si ii velocity. A second group consists of normal SNe Ia, also with high temporal velocity gradient ( HVG), but with brighter mean absolute magnitude hM B i ¼ À19:3 and higher expansion velocities than the FAINT SNe. The third group includes both normal and SN 1991T-like SNe Ia: these SNe populate a narrow strip in the Si ii velocity evolution plot, with a lowvelocity gradient ( LVG), but have absolute magnitudes similar to HVGs. While the FAINT and HVG SNe Ia together seem to define a relation between R(Si ii) and Ám 15 (B), the LVG SNe either do not conform to that relation or define a new, looser one. The R(Si ii) premaximum evolution of HVGs is strikingly different from that of LVGs. We discuss the impact of this evidence on the understanding of SN Ia diversity, in terms of explosion mechanisms, degree of ejecta mixing, and ejecta-circumstellar material interaction.

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Theorem of Stickelberger-Voronoi

Cited by 2 publications

References 1 publication

Progenitor constraints for core-collapse supernovae fromChandraX-ray observations

Progenitor constraints for core-collapse supernovae fromChandraX-ray observations

The Diversity of Type Ia Supernovae: Evidence for Systematics?

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