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The spin-down limit of the continuous gravitational wave strain from pulsarsassumed to be triaxial stars rotating about a principal moment of inertia axisdepends upon the value of the intrinsic spin frequency derivative of thepulsar, among other parameters. In order to get more accurate intrinsic spinfrequency derivative values, dynamical effects contributing to the measuredspin frequency derivative values must be estimated via more realisticapproaches. In this work, we calculated improved values for the spin-down limitof the continuous gravitational wave strain (assuming that pulsars are triaxialstars rotating about a principal moment of inertia axis) for a set of 237pulsars for which a targeted search for continuous gravitational waves wasrecently carried out by the LIGO-Virgo-KAGRA (LVK) Collaboration. We used`GalDynPsr', a Python-based public package, to calculate more realistic valuesfor the intrinsic spin frequency derivatives and, consequently, we get morerealistic values of the spin-down limit. The realistic values that we obtainfor the intrinsic spin frequency derivatives can also provide a valuablecontribution to improving the sensitivity of searches for continuousgravitational waves from known pulsars.

Improving the spin-down limits of the continuous gravitational waves emitted from rotating triaxial pulsars