NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T01:23:45 PDT
Help | Comment | NED Home

For refcode 2015ApJ...806..225P:
Retrieve 37 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2015ApJ...806..225P On the Intrinsic Diversity of Type II-Plateau Supernovae Pejcha, Ondrej; Prieto, Jose L. Abstract. Hydrogen-rich Type II-Plateau supernovae (SNe) exhibit correlations between the plateau luminosity {L}_{pl_}, the nickel mass {M}_{Ni_}, the explosion energy {E}_{exp_}, and the ejecta mass {M}_{ej_}. Using our global, self-consistent, multi-band model of nearby well-observed SNe, we find that the covariances of these quantities are strong and that the confidence ellipsoids are oriented in the direction of the correlations, which reduces their significance. By proper treatment of the covariance matrix of the model, we discover a significant intrinsic width to the correlations between {L}_{pl_}, {E}_{exp_} and {M}_{Ni_}, where the uncertainties due to the distance and the extinction dominate. For fixed {E}_{exp_}, the spread in {M}_{Ni_} is about 0.25 dex, which we attribute to the differences in the progenitor internal structure. We argue that the effects of incomplete gamma-ray trapping are not important in our sample. Similarly, the physics of the Type II-Plateau SN light curves leads to inherently degenerate estimates of {E}_{exp_} and {M}_{ej_}, which makes their observed correlation weak. Ignoring the covariances of SN parameters or the intrinsic width of the correlations causes significant biases in the slopes of the fitted relations. Our results imply that Type II-Plateau SN explosions are not described by a single physical parameter or a simple one-dimensional trajectory through the parameter space, but instead reflect the diversity of the core and surface properties of their progenitors. We discuss the implications for the physics of the explosion mechanism and possible future observational constraints. Key words: methods: statistical, stars: distances, supernovae: general
Retrieve 37 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home