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The Volumetric Rate of Calcium-rich Transients in the Local Universe

  • Author(s): Frohmaier, C
  • Sullivan, M
  • Maguire, K
  • Nugent, P
  • et al.
Abstract

© 2018. The American Astronomical Society. All rights reserved. We present a measurement of the volumetric rate of "calcium-rich" optical transients in the local universe, using a sample of three events from the Palomar Transient Factory (PTF). This measurement builds on a detailed study of the PTF transient detection efficiencies and uses a Monte Carlo simulation of the PTF survey. We measure the volumetric rate of calcium-rich transients to be higher than previous estimates: - 1.21+0.39 1.13 10-5 events yr-1Mpc-3. This is equivalent to 33%-94% of the local volumetric Type Ia supernova rate. This calcium-rich transient rate is sufficient to reproduce the observed calcium abundances in galaxy clusters, assuming an asymptotic calcium yield per calcium-rich event of .0.05 M. We also study the PTF detection efficiency of these transients as a function of position within their candidate host galaxies. We confirm as a real physical effect previous results that suggest that calcium-rich transients prefer large physical offsets from their host galaxies.

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