2024/09/24 by Covas, P. B., Papa, M. A., Prix, R. · 3 citations
#FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc)
paper · doi:10.48550/arxiv.2409.16196
Gravitational waves emitted by asymmetric rotating neutron stars are the primary targets of continuous gravitational-wave searches. Neutron stars in binary systems are particularly interesting due to the potential for non-axisymmetric deformations induced by a companion star. However, all-sky searches for unknown neutron stars in binary systems are very computationally expensive and this limits their sensitivity and/or breadth. In this paper we present results of a search for signals with gravitational-wave frequencies between 50 and 150~Hz, from systems with orbital periods between 100 and 1 000 days and projected semi-major axes between 40 and 200~light-seconds. This parameter-space region has never been directly searched before. We do not detect any signal, and our results exclude gravitational-wave amplitudes above 1.25 × 10-25 at 144.32~Hz with 95% confidence. Our improved search pipeline is more sensitive than any previous all-sky binary search by about 75%.