The diversity of type Ia supernovae: Evidence for systematics?

S. Benetti, E. Cappellaro, P. A. Mazzali, M. Turatto, G. Altavilla, F. Bufano, N. Elias-Rosa, R. Kotak, G. Pignata, M. Salvo, V. Stanishev

Resultado de la investigación: Article

252 Citas (Scopus)

Resumen

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 〈M B〉 = -19.3 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 low-velocity 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 Δm15(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.

Idioma originalEnglish
Páginas (desde-hasta)1011-1016
Número de páginas6
PublicaciónAstrophysical Journal
Volumen623
N.º2 I
DOI
EstadoPublished - 20 abr 2005

Huella dactilar

supernovae
gradients
ejecta
low speed
expansion
explosions
strip
extreme event
plots
explosion
interactions

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Benetti, S., Cappellaro, E., Mazzali, P. A., Turatto, M., Altavilla, G., Bufano, F., ... Stanishev, V. (2005). The diversity of type Ia supernovae: Evidence for systematics? Astrophysical Journal, 623(2 I), 1011-1016. https://doi.org/10.1086/428608
Benetti, S. ; Cappellaro, E. ; Mazzali, P. A. ; Turatto, M. ; Altavilla, G. ; Bufano, F. ; Elias-Rosa, N. ; Kotak, R. ; Pignata, G. ; Salvo, M. ; Stanishev, V. / The diversity of type Ia supernovae : Evidence for systematics?. En: Astrophysical Journal. 2005 ; Vol. 623, N.º 2 I. pp. 1011-1016.
@article{8288f10fcd0f4d3083c79720fbe59254,
title = "The diversity of type Ia supernovae: Evidence for systematics?",
abstract = "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 〈M B〉 = -19.3 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 low-velocity 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 Δm15(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.",
keywords = "Supernovae: general",
author = "S. Benetti and E. Cappellaro and Mazzali, {P. A.} and M. Turatto and G. Altavilla and F. Bufano and N. Elias-Rosa and R. Kotak and G. Pignata and M. Salvo and V. Stanishev",
year = "2005",
month = "4",
day = "20",
doi = "10.1086/428608",
language = "English",
volume = "623",
pages = "1011--1016",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2 I",

}

Benetti, S, Cappellaro, E, Mazzali, PA, Turatto, M, Altavilla, G, Bufano, F, Elias-Rosa, N, Kotak, R, Pignata, G, Salvo, M & Stanishev, V 2005, 'The diversity of type Ia supernovae: Evidence for systematics?', Astrophysical Journal, vol. 623, n.º 2 I, pp. 1011-1016. https://doi.org/10.1086/428608

The diversity of type Ia supernovae : Evidence for systematics? / Benetti, S.; Cappellaro, E.; Mazzali, P. A.; Turatto, M.; Altavilla, G.; Bufano, F.; Elias-Rosa, N.; Kotak, R.; Pignata, G.; Salvo, M.; Stanishev, V.

En: Astrophysical Journal, Vol. 623, N.º 2 I, 20.04.2005, p. 1011-1016.

Resultado de la investigación: Article

TY - JOUR

T1 - The diversity of type Ia supernovae

T2 - Evidence for systematics?

AU - Benetti, S.

AU - Cappellaro, E.

AU - Mazzali, P. A.

AU - Turatto, M.

AU - Altavilla, G.

AU - Bufano, F.

AU - Elias-Rosa, N.

AU - Kotak, R.

AU - Pignata, G.

AU - Salvo, M.

AU - Stanishev, V.

PY - 2005/4/20

Y1 - 2005/4/20

N2 - 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 〈M B〉 = -19.3 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 low-velocity 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 Δm15(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.

AB - 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 〈M B〉 = -19.3 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 low-velocity 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 Δm15(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.

KW - Supernovae: general

UR - http://www.scopus.com/inward/record.url?scp=20444421309&partnerID=8YFLogxK

U2 - 10.1086/428608

DO - 10.1086/428608

M3 - Article

AN - SCOPUS:20444421309

VL - 623

SP - 1011

EP - 1016

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2 I

ER -

Benetti S, Cappellaro E, Mazzali PA, Turatto M, Altavilla G, Bufano F y otros. The diversity of type Ia supernovae: Evidence for systematics? Astrophysical Journal. 2005 abr 20;623(2 I):1011-1016. https://doi.org/10.1086/428608