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Characterizing The V-Band Light-Curves Of Hydrogen-Rich Type II Supernovae.

Universidad de Chile. Repositorio Académico

Título Characterizing The V-Band Light-Curves Of Hydrogen-Rich Type II Supernovae.
Autor Gonzalez-Gaitán, Santiago
Gutiérrez, Claudia P.
González, Luis
Suntzeff, Nicholas B.
Hsiao, Eric
Roth, Miguel
Hamuy Wackenhut, Mario Andrés
Stritzinger, Maximilian D.
Freedman, Wendy L.
Thomas-Osip, Joanna
Krisciunas, Kevin
Salgado, Francisco
Folatelli, Gaston
Schulze, Steve
Forster, Francisco
Bolt, Luis
Krzeminski, Wojtek
Campillay, Abdo
McCarthy, Patrick
Contreras, Carlos
Persson, Sven E.
Antezana, Roberto
Phillips, Mark M.
Castellon, Sergio
Olivares E., Felipe
de Jaeger, Thomas
Morrell, Nidia
Maza Sancho, José María
Tema supernovae: general
Descripción Artículo de publicación ISI.
We present an analysis of the diversity of V-band light-curves of hydrogen-rich type II supernovae. Analyzing a
sample of 116 supernovae, several magnitude measurements are defined, together with decline rates at different
epochs, and time durations of different phases. It is found that magnitudes measured at maximum light correlate
more strongly with decline rates than those measured at other epochs: brighter supernovae at maximum generally
have faster declining light-curves at all epochs. We find a relation between the decline rate during the “plateau”
phase and peak magnitudes, which has a dispersion of 0.56 mag, offering the prospect of using type II supernovae
as purely photometric distance indicators. Our analysis suggests that the type II population spans a continuum from
low-luminosity events which have flat light-curves during the “plateau” stage, through to the brightest events which
decline much faster. A large range in optically thick phase durations is observed, implying a range in progenitor
envelope masses at the epoch of explosion. During the radioactive tails, we find many supernovae with faster
declining light-curves than expected from full trapping of radioactive emission, implying low mass ejecta. It is
suggested that the main driver of light-curve diversity is the extent of hydrogen envelopes retained before explosion.
Finally, a new classification scheme is introduced where hydrogen-rich events are typed as simply “SN II” with an
“s2” value giving the decline rate during the “plateau” phase, indicating its morphological type.
Fecha 2014-09-16T13:26:22Z
Tipo Artículo de revista
Enlace The Astrophysical Journal, 786:67 (35pp), 2014 May 1
Publicador The American Astronomical Society