White dwarf dynamical interactions and fast optical transients
Garcia-Berro, E; Badenes, C; Aznar-Siguan, G; et al.Loren-Aguilar, P
Date: 3 April 2017
Journal
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press (OUP) / Royal Astronomical Society
Publisher DOI
Abstract
Recent advances in time-domain astronomy have uncovered a new class of optical
transients with timescales shorter than typical supernovae and a wide range of peak
luminosities. Several subtypes have been identi ed within this broad class, including
Ca-rich transients, .Ia supernovae, and fast/bright transients. We examine the ...
Recent advances in time-domain astronomy have uncovered a new class of optical
transients with timescales shorter than typical supernovae and a wide range of peak
luminosities. Several subtypes have been identi ed within this broad class, including
Ca-rich transients, .Ia supernovae, and fast/bright transients. We examine the predic-
tions from a state-of-the-art grid of three-dimensional simulations of dynamical white
dwarf interactions in the context of these fast optical transients. We nd that for colli-
sions involving carbon-oxygen or oxygen-neon white dwarfs the peak luminosities and
durations of the light curves in our models are in good agreement with the properties
of fast/bright transients. When one of the colliding white dwarfs is made of helium
the properties of the light curves are similar to those of Ca-rich gap transients. The
model lightcurves from our white dwarf collisions are too slow to reproduce those of
.Ia SNe, and too fast to match any normal or peculiar Type Ia supernova.
Physics and Astronomy
Faculty of Environment, Science and Economy
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