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Core-Collapse Supernovae as Standard Candles: The Correlation between Luminosity and Expansion Velocity for Type II Plateau Supernovae - Couverture souple

Olivares E., Felipe; Hamuy, Mario

 
9783844302851: Core-Collapse Supernovae as Standard Candles: The Correlation between Luminosity and Expansion Velocity for Type II Plateau Supernovae
Couverture souple
ISBN 10 : 3844302859 ISBN 13 : 9783844302851
Editeur : LAP LAMBERT Academic Publishing, 2011

Synopsis

We study the standardized candle method for type II "plateau" supernovae by means of BVRI photometry and optical spectroscopy. An analytical procedure was implemented in order to model the light curves, color curves, and expansion-velocity curves. We find that their V-I colors can be use as proxies of the extinction caused by interstellar dust in their host galaxies. After the necessary corrections to photometry, we are able to recover the correlation between luminosity and expansion velocity previously reported in the literature for this supernova type. Given this and assuming the standard extinction law, our Hubble diagrams show dispersions of 0.4 magnitudes in the BVI filter bands. On the other hand, if the extinction law is entered as a free parameter, we derive final dispersions of 0.3 magnitudes, which implies that this kind of supernova delivers distances as precise as 12%. The resulting extinction law suggests a different interstellar medium in their host galaxies than that of our Galaxy. Calibrating the correlation between luminosity and expansion velocity, we obtain a Hubble constant of 70 km/s/Mpc, in good agreement with modern measurements.

Les informations fournies dans la section « Synopsis » peuvent faire référence à une autre édition de ce titre.

Présentation de l'éditeur

We study the standardized candle method for type II "plateau" supernovae by means of BVRI photometry and optical spectroscopy. An analytical procedure was implemented in order to model the light curves, color curves, and expansion-velocity curves. We find that their V-I colors can be use as proxies of the extinction caused by interstellar dust in their host galaxies. After the necessary corrections to photometry, we are able to recover the correlation between luminosity and expansion velocity previously reported in the literature for this supernova type. Given this and assuming the standard extinction law, our Hubble diagrams show dispersions of 0.4 magnitudes in the BVI filter bands. On the other hand, if the extinction law is entered as a free parameter, we derive final dispersions of 0.3 magnitudes, which implies that this kind of supernova delivers distances as precise as 12%. The resulting extinction law suggests a different interstellar medium in their host galaxies than that of our Galaxy. Calibrating the correlation between luminosity and expansion velocity, we obtain a Hubble constant of 70 km/s/Mpc, in good agreement with modern measurements.

Biographie de l'auteur

F.O.E., Master of Science, Major in Astronomy, from Universidad de Chile, is currently pursuing the Ph.D. degree at the Max Planck Institute for Extraterrestrial Physics. M.H., Ph.D. in Astronomy from University of Arizona, has vast experience in supernova science. Nowadays he is Director of the Astronomy Department at Universidad de Chile.

Les informations fournies dans la section « A propos du livre » peuvent faire référence à une autre édition de ce titre.

Éditeur
LAP LAMBERT Academic Publishing
Date d'édition
2011
Langue
anglais
ISBN 10 
3844302859
ISBN 13 
9783844302851
Reliure
Broché
Nombre de pages
96
Coordonnées du fabricant
non disponible
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