http://arxiv.org/abs/2204.12869
Recently, Espinoza et al. (2014, 2021) reported the existence of “glitch candidates” and “anti-glitch candidates” which are effectively small spin-ups and spin-downs of a neutron star with magnitudes smaller than those seen in typical glitches. The physical origin of these small events is not yet understood. In this paper, we outline a model that can account for the changes in spin, and crucially, is independently testable with gravitational wave observations. In brief, the model posits that small spin-up/spin-down events are caused by the excitation and decay of non-axisymmetric $f$-modes which radiate angular momentum away in a burst-like way as gravitational waves. The model takes the change in spin frequency as an input and outputs the initial mode amplitude and the signal-to-noise ratio achievable from gravitational wave detectors. We find that the model presented here will become falsifiable once 3rd generation gravitational wave detectors, like the Einstein Telescope, begin taking data.
G. Yim and D. Jones
Thu, 28 Apr 22
50/70
Comments: 8 pages, 5 figures