A study of the color diversity around maximum light in Type Ia supernovae

R. Cartier, F. Förster, P. Coppi, M. Hamuy, K. Maeda, G. Pignata, G. Folatelli

Resultado de la investigación: Article

9 Citas (Scopus)

Resumen

From a sample of 12 well-observed Type Ia supernovae, we find clear evidence of correlations between early phase (U-B), (V-R), and (V-I) colors and the velocity shifts of the [Fe II] λ7155 and [Ni II] λ7378 nebular lines measured from late-phase spectra. As these lines are thought to trace the ashes of the initial deflagration process, our findings provide additional support to the new paradigm of off-center explosions in Type Ia supernovae, and we interpret these correlations as viewing angle effects in the observed colors. We also show that the nebular velocity shifts are related to the strength and width of the Ca II and IR-triplet lines near-maximum light. The evidence presented here implies that the viewing angle must be taken into account when deriving extinction values and distances in future cosmological studies based on Type Ia supernovae.

Idioma originalEnglish
Número de artículoL15
PublicaciónAstronomy and Astrophysics
Volumen534
DOI
EstadoPublished - 2011

Huella dactilar

supernovae
color
explosion
deflagration
ash
extinction
shift
ashes
explosions
effect

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Cartier, R. ; Förster, F. ; Coppi, P. ; Hamuy, M. ; Maeda, K. ; Pignata, G. ; Folatelli, G. / A study of the color diversity around maximum light in Type Ia supernovae. En: Astronomy and Astrophysics. 2011 ; Vol. 534.
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A study of the color diversity around maximum light in Type Ia supernovae. / Cartier, R.; Förster, F.; Coppi, P.; Hamuy, M.; Maeda, K.; Pignata, G.; Folatelli, G.

En: Astronomy and Astrophysics, Vol. 534, L15, 2011.

Resultado de la investigación: Article

TY - JOUR

T1 - A study of the color diversity around maximum light in Type Ia supernovae

AU - Cartier, R.

AU - Förster, F.

AU - Coppi, P.

AU - Hamuy, M.

AU - Maeda, K.

AU - Pignata, G.

AU - Folatelli, G.

PY - 2011

Y1 - 2011

N2 - From a sample of 12 well-observed Type Ia supernovae, we find clear evidence of correlations between early phase (U-B), (V-R), and (V-I) colors and the velocity shifts of the [Fe II] λ7155 and [Ni II] λ7378 nebular lines measured from late-phase spectra. As these lines are thought to trace the ashes of the initial deflagration process, our findings provide additional support to the new paradigm of off-center explosions in Type Ia supernovae, and we interpret these correlations as viewing angle effects in the observed colors. We also show that the nebular velocity shifts are related to the strength and width of the Ca II and IR-triplet lines near-maximum light. The evidence presented here implies that the viewing angle must be taken into account when deriving extinction values and distances in future cosmological studies based on Type Ia supernovae.

AB - From a sample of 12 well-observed Type Ia supernovae, we find clear evidence of correlations between early phase (U-B), (V-R), and (V-I) colors and the velocity shifts of the [Fe II] λ7155 and [Ni II] λ7378 nebular lines measured from late-phase spectra. As these lines are thought to trace the ashes of the initial deflagration process, our findings provide additional support to the new paradigm of off-center explosions in Type Ia supernovae, and we interpret these correlations as viewing angle effects in the observed colors. We also show that the nebular velocity shifts are related to the strength and width of the Ca II and IR-triplet lines near-maximum light. The evidence presented here implies that the viewing angle must be taken into account when deriving extinction values and distances in future cosmological studies based on Type Ia supernovae.

KW - Distance scale

KW - Supernovae: general

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U2 - 10.1051/0004-6361/201117778

DO - 10.1051/0004-6361/201117778

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JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

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