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An asymmetric explosion as the origin of spectral evolution diversity in type Ia supernovae.

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Title: An asymmetric explosion as the origin of spectral evolution diversity in type Ia supernovae.
Authors: Maeda, K., Benetti, S., Stritzinger, M., Röpke, F. K., Folatelli, G., Sollerman, J., Taubenberger, S., Nomoto, K., Leloudas, G., Hamuy, M., Tanaka, M., Mazzali, P. A., Elias-Rosa, N.
Source: Nature. 7/1/2010, Vol. 466 Issue 7302, p82-85. 4p. 1 Diagram, 3 Graphs.
Subjects: Type I supernovae, Thermonuclear fuels, Luminosity distance, Density, Thermal neutrons, Acoustic phenomena in nature, Temperature, Nebular hypothesis, Speed
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. [ABSTRACT FROM AUTHOR]
Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: An asymmetric explosion as the origin of spectral evolution diversity in type Ia supernovae.
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  Data: <searchLink fieldCode="AR" term="%22Maeda%2C+K%2E%22">Maeda, K.</searchLink><br /><searchLink fieldCode="AR" term="%22Benetti%2C+S%2E%22">Benetti, S.</searchLink><br /><searchLink fieldCode="AR" term="%22Stritzinger%2C+M%2E%22">Stritzinger, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Röpke%2C+F%2E+K%2E%22">Röpke, F. K.</searchLink><br /><searchLink fieldCode="AR" term="%22Folatelli%2C+G%2E%22">Folatelli, G.</searchLink><br /><searchLink fieldCode="AR" term="%22Sollerman%2C+J%2E%22">Sollerman, J.</searchLink><br /><searchLink fieldCode="AR" term="%22Taubenberger%2C+S%2E%22">Taubenberger, S.</searchLink><br /><searchLink fieldCode="AR" term="%22Nomoto%2C+K%2E%22">Nomoto, K.</searchLink><br /><searchLink fieldCode="AR" term="%22Leloudas%2C+G%2E%22">Leloudas, G.</searchLink><br /><searchLink fieldCode="AR" term="%22Hamuy%2C+M%2E%22">Hamuy, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Tanaka%2C+M%2E%22">Tanaka, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Mazzali%2C+P%2E+A%2E%22">Mazzali, P. A.</searchLink><br /><searchLink fieldCode="AR" term="%22Elias-Rosa%2C+N%2E%22">Elias-Rosa, N.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Nature%22">Nature</searchLink>. 7/1/2010, Vol. 466 Issue 7302, p82-85. 4p. 1 Diagram, 3 Graphs.
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  Data: 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. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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