Detecting gravitational waves from mountains on neutron stars in the advanced detector era

摘要: Rapidly rotating Neutron Stars (NSs) in Low Mass X-ray Binaries (LMXBs) are thought to be interesting sources of Gravitational Waves (GWs) for current and next generation ground based detectors, such as Advanced LIGO the Einstein Telescope. The main reason is that many NS these systems appear spinning well below their Keplerian breakup frequency, it has been suggested torques associated with GW emission may setting observed spin period. This assumption used extensively literature assess strength likely gravitational wave signal. There now, however, a significant amount theoretical observation work suggests this not case, unlikely equilibrium period systems. In paper we take different starting point predict signal two physical mechanisms at LMXBs: crustal mountains due thermal asymmetries magnetically confined mountains. We find transient LMXBs lead detectable emission, while persistent good candidates detection by Detection prospects pessimistic magnetic mountain unless buried field $B\approx 10^{12}$ G, above typically inferred exterior dipole fields objects. Nevertheless, if system were detected observatory, cyclotron resonant scattering features could distinguish between scenarios.