Directed search for continuous gravitational waves from the possible kilonova remnant G4.8+6.2

Yu Liu and Yuan-Chuan Zou

Submitted on 5 November 2022


G4.8+6.2 was proposed as a possible kilonova remnant associated with the Korean guest star of AD 1163 in our Milky Way galaxy. Its age is about 860 years according to the historical record. If a neutron star was left in the center of G4.8+6.2, this young neutron star may radiate strong continuous gravitational waves, which could beat the indirect age-based upper limit with current LIGO sensitivity. In this work, we searched such continuous gravitational waves in the frequency band 201500 Hz. This search used two days of LIGO O3b data from the Hanford and Livingston detectors. While no signal was found, we placed upper limits on the gravitational wave strain. For comparison we also showed the latest results of all-sky searches obtained with various search pipelines. With upgrading of the LIGO detectors, it will provide the opportunity to see whether a black hole or a neutron star is harbored inside G4.8+6.2.


Comment: 8 pages, 6 figures, 1 tables, Accepted for publication in Physical Review D

Subjects: Astrophysics - High Energy Astrophysical Phenomena; General Relativity and Quantum Cosmology


Multi-band radio light curves emitted from the kilonova ejecta-PWN system of the GW170817 event remnant introduced by \citet{Ren2022} rescaled to $8.1 \mathrm{~kpc}$.