Institute of Astronomy

The Binary Progenitors of Ca-rich Transients

SpeakerTalk DateTalk Series
Ross Church28 July 2016Binary Stars Talks

Abstract

One of the more intriguing results from the Palomar Transit Factory has been the identification of a new class of transients, commonly known as calcium-rich transients or gap transients. Ca-rich transients fall into the luminosity gap between novae and supernovae, and their spectra evolve rapidly to a nebular phase dominated by strong calcium lines. Most interestingly, though, they are often found at large spatial offsets from their host galaxies. Our observational work has shown that, in at least some cases, their progenitors can not have formed in situ but must have been ejected from their host stellar populations. I will review possible binary progenitor models for Ca-rich transients, in particular the possibility that they are formed from the tidal disruption of white dwarfs as they merge with neutron stars in binaries that have been ejected from the host galaxies by supernova kicks.

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