Sengupta, Anand et al.Anand et al.Sengupta2025-08-312025-08-312019-04-2010.3847/1538-4357/ab113b2-s2.0-85067178226https://repository.iitgn.ac.in/handle/IITG2025/23305We describe directed searches for continuous gravitational waves (GWs) from 16 well-localized candidate neutron stars, assuming none of the stars has a binary companion. The searches were directed toward 15 supernova remnants and Fomalhaut b, a directly imaged extrasolar planet candidate that has been suggested to be a nearby old neutron star. Each search covered a broad band of frequencies and first and second time derivatives. After coherently integrating spans of data from the first Advanced LIGO observing run of 3.5-53.7 days per search, applying data-based vetoes, and discounting known instrumental artifacts, we found no astrophysical signals. We set upper limits on intrinsic GW strain as strict as 1 ×10^-25, fiducial neutron star ellipticity as strict as 2 ×10^-9, and fiducial r-mode amplitude as strict as 3 ×10^-8.truegravitational waves | ISM: supernova remnants | stars: neutronArticlehttps://iopscience.iop.org/article/10.3847/1538-4357/ab113b/pdf1538435720 April 20195412256WOS:000465641500007