Type Ia supernovae form an observationally uniform class of stellar
explosions, in that more luminous objects have smaller decline-rates.
This one-parameter behaviour allows type Ia supernovae to be calibrated
as cosmological 'standard candles', and led to the discovery of an
accelerating Universe. Recent investigations, however, have revealed
that the true nature of type Ia supernovae is more complicated. Theoretically,
it has been suggested that the initial thermonuclear sparks are ignited
at an offset from the centre of the white-dwarf progenitor, possibly
as a result of convection before the explosion. Observationally,
the diversity seen in the spectral evolution of type Ia supernovae
beyond the luminosity-decline-rate relation is an unresolved issue.
Here we report that the spectral diversity is a consequence of random
directions from which an asymmetric explosion is viewed. Our findings
suggest that the spectral evolution diversity is no longer a concern
when using type Ia supernovae as cosmological standard candles. Furthermore,
this indicates that ignition at an offset from the centre is a generic
feature of type Ia supernovae.
%0 Journal Article
%1 maeda:2010
%A Maeda, K.
%A Benetti, S.
%A Stritzinger, M.
%A Ropke, F. K.
%A Folatelli, G.
%A Sollerman, J.
%A Taubenberger, S.
%A Nomoto, K.
%A Leloudas, G.
%A Hamuy, M.
%A Tanaka, M.
%A Mazzali, P. A.
%A Elias-Rosa, N.
%D 2010
%J Nature
%K astrophysics
%N 7302
%P 82--85
%R 10.1038/nature09122
%T An asymmetric explosion as the origin of spectral evolution diversity
in type Ia supernovae.
%V 466
%X Type Ia supernovae form an observationally uniform class of stellar
explosions, in that more luminous objects have smaller decline-rates.
This one-parameter behaviour allows type Ia supernovae to be calibrated
as cosmological 'standard candles', and led to the discovery of an
accelerating Universe. Recent investigations, however, have revealed
that the true nature of type Ia supernovae is more complicated. Theoretically,
it has been suggested that the initial thermonuclear sparks are ignited
at an offset from the centre of the white-dwarf progenitor, possibly
as a result of convection before the explosion. Observationally,
the diversity seen in the spectral evolution of type Ia supernovae
beyond the luminosity-decline-rate relation is an unresolved issue.
Here we report that the spectral diversity is a consequence of random
directions from which an asymmetric explosion is viewed. Our findings
suggest that the spectral evolution diversity is no longer a concern
when using type Ia supernovae as cosmological standard candles. Furthermore,
this indicates that ignition at an offset from the centre is a generic
feature of type Ia supernovae.
@article{maeda:2010,
abstract = {Type Ia supernovae form an observationally uniform class of stellar
explosions, in that more luminous objects have smaller decline-rates.
This one-parameter behaviour allows type Ia supernovae to be calibrated
as cosmological 'standard candles', and led to the discovery of an
accelerating Universe. Recent investigations, however, have revealed
that the true nature of type Ia supernovae is more complicated. Theoretically,
it has been suggested that the initial thermonuclear sparks are ignited
at an offset from the centre of the white-dwarf progenitor, possibly
as a result of convection before the explosion. Observationally,
the diversity seen in the spectral evolution of type Ia supernovae
beyond the luminosity-decline-rate relation is an unresolved issue.
Here we report that the spectral diversity is a consequence of random
directions from which an asymmetric explosion is viewed. Our findings
suggest that the spectral evolution diversity is no longer a concern
when using type Ia supernovae as cosmological standard candles. Furthermore,
this indicates that ignition at an offset from the centre is a generic
feature of type Ia supernovae.},
added-at = {2010-07-23T07:14:55.000+0200},
author = {Maeda, K. and Benetti, S. and Stritzinger, M. and Ropke, F. K. and Folatelli, G. and Sollerman, J. and Taubenberger, S. and Nomoto, K. and Leloudas, G. and Hamuy, M. and Tanaka, M. and Mazzali, P. A. and Elias-Rosa, N.},
biburl = {https://www.bibsonomy.org/bibtex/2cd6d2ada2ab0207fb04b39c4ac4916b9/richterek},
doi = {10.1038/nature09122},
interhash = {342536f741b56cb43d145237be196265},
intrahash = {cd6d2ada2ab0207fb04b39c4ac4916b9},
journal = {Nature},
keywords = {astrophysics},
mendeley-tags = {astrophysics},
month = jul,
number = 7302,
pages = {82--85},
timestamp = {2010-07-23T07:15:03.000+0200},
title = {{An asymmetric explosion as the origin of spectral evolution diversity
in type Ia supernovae.}},
type = {Journal article},
volume = 466,
year = 2010
}