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arXiv · 2409.15653

Capability of Searching for Kilonova Associated with a Short Gamma-ray Burst by SVOM

J. Wang·L. P. Xin·Y. L. Qiu·L. Lan·W. J. Xie·Z. P. Jin·J. Y. Wei
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Abstract

In spite of the importance of studying the cosmic generation of heavy elements through the r-process, the detection of kilonova resulted from a merger of neutron star binaries is still a challenge task. In this paper, we show that the Visible Telescope (VT) onboard the on-going SVOM space mission is powerful for identifying kilonova candidates associated with short gamma-ray bursts (SGRBs) up to a distance of 600Mpc. A significant color variation, turn blue and then turn red, is revealed by calculating the light curves in both red and blue channels of VT by a linear combination of an afterglow and an associated kilonova. The maximum color variation is as high as $\sim0.5-1$ mag, which is far larger than the small photometry error of $\sim0.2$ mag of VT for a point source with a brightness of 23 mag. Up to a distance of 600Mpc, $\sim1-2$ kilonova candidates per year are predicted to be identified by VT.

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J. Wang, L. P. Xin, Y. L. Qiu, L. Lan, W. J. Xie, Z. P. Jin, J. Y. Wei. 2024-09-24. Capability of Searching for Kilonova Associated with a Short Gamma-ray Burst by SVOM. https://arxiv.org/abs/2409.15653

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