The volumetric rate of calcium-rich transients in the local universe
The volumetric rate of calcium-rich transients in the local universe
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+1.13−0.39×10−5 events yr−1 Mpc−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 ~0.05M⊙. 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 calcium-rich transients prefer large physical offsets from their host galaxies.
Frohmaier, Christopher
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Sullivan, Mark
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Maguire, Kate
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Nugent, Peter E.
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Frohmaier, Christopher
9e031e04-b5ac-4949-80a5-92e5e13201c0
Sullivan, Mark
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Maguire, Kate
bff26e2d-9727-471e-aa6f-c88e11a2b1a1
Nugent, Peter E.
f98e37c2-aa8f-455b-8eb9-5b350046a2e0
Frohmaier, Christopher, Sullivan, Mark, Maguire, Kate and Nugent, Peter E.
(2018)
The volumetric rate of calcium-rich transients in the local universe.
The Astrophysical Journal, 858 (50).
(doi:10.3847/1538-4357/aabc0b).
Abstract
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+1.13−0.39×10−5 events yr−1 Mpc−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 ~0.05M⊙. 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 calcium-rich transients prefer large physical offsets from their host galaxies.
Text
THE VOLUMETRIC RATE OF CALCIUM-RICH TRANSIENTS IN THE LOCAL UNIVERSE
- Accepted Manuscript
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Accepted/In Press date: 3 April 2018
e-pub ahead of print date: 4 May 2018
Identifiers
Local EPrints ID: 419671
URI: https://eprints.soton.ac.uk/id/eprint/419671
ISSN: 0004-637X
PURE UUID: 487a1103-c894-4635-8285-8c810edb86d4
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Date deposited: 19 Apr 2018 16:30
Last modified: 15 Aug 2019 00:36
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Author:
Kate Maguire
Author:
Peter E. Nugent
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