Calcium-rich gap transients: tidal detonations of white dwarfs?

P.H. Sell, Thomas Maccarone, R. Kotak, C. Knigge, D.J. Sand

Research output: Contribution to journalArticle

Abstract

We hypothesize that at least some of the recently discovered class of calcium-rich gap transients are tidal detonation events of white dwarfs (WDs) by black holes (BHs) or possibly neutron stars. We show that the properties of the calcium-rich gap transients agree well with the predictions of the tidal detonation model. Under the predictions of this model, we use a follow-up X-ray observation of one of these transients, SN 2012hn, to place weak upper limits on the detonator mass of this system that include all intermediate-mass BHs (IMBHs). As these transients are preferentially in the stellar haloes of galaxies, we discuss the possibility that these transients are tidal detonations of WDs caused by random flyby encounters with IMBHs in dwarf galaxies or globular clusters. This possibility has been already suggested in the literature but without connection to the calcium-rich gap transients. In order for the random flyby cross-section to be high enough, these events would have to be o
Original languageEnglish
Pages (from-to)4198-4206
JournalMonthly Notices of the Royal Astronomical Society
StatePublished - Jul 2015

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