The volumetric rate of calcium-rich transients in the local universe

2); (2) University of Portsmouth; (3) Queens University Belfast; (4) University of California Berkeley; 5) ((1) University of Southampton; (5) Lawrence Berkeley National Laboratory); C. Frohmaier (1; K. Maguire (3); M. Sullivan (1); P. E. Nugent (4

The volumetric rate of calcium-rich transients in the local universe

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arxiv 1804.03103 v1 pith:7NNGUFU6 submitted 2018-04-09 astro-ph.HE

C. Frohmaier (1 , 2) , M. Sullivan (1) , K. Maguire (3) , P. E. Nugent (4 , 5) ((1) University of Southampton , (2) University of Portsmouth , (3) Queens University Belfast

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(4) University of California Berkeley (5) Lawrence Berkeley National Laboratory)

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keywords calcium-richratetransientsvolumetriclocaltransientcalciumdetection

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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: $1.21^{+1.13}_{-0.39}\times10^{-5}$ 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 ~0.05$\mathrm{M}_{\odot}$. 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.

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AT 2024qfm: a luminous fast blue optical transient at a redshift of z = 0.2267 identified by Lasair-ZTF
astro-ph.HE 2026-08 accept novelty 6.0 of 10

A new luminous fast blue optical transient, AT 2024qfm, was discovered at z=0.2267 with a Lasair broker filter and matches AT 2018cow in luminosity and 13 day fade.

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