Abbott, B. P.B. P.AbbottAbbott, R.R.AbbottAbbott, T. D.T. D.AbbottAbraham, S.S.AbrahamAcernese, F.F.AcerneseAckley, K.K.AckleyAdams, C.C.AdamsAdhikari, R. X.R. X.AdhikariAdya, V. B.V. B.AdyaAffeldt, C.C.AffeldtAgathos, M.M.AgathosAgatsuma, K.K.AgatsumaAggarwal, N.N.AggarwalAguiar, O. D.O. D.AguiarAiello, L.L.AielloAin, A.A.AinAjith, P.P.AjithAllen, G.G.AllenAllocca, A.A.AlloccaAloy, M. A.M. A.AloyAltin, P. A.P. A.AltinAmato, A.A.AmatoAnanyeva, A.A.AnanyevaAnderson, S. B.S. B.AndersonAnderson, W. G.W. G.AndersonAngelova, S. V.S. V.AngelovaAntier, S.S.AntierAppert, S.S.AppertArai, K.K.AraiAraya, M. C.M. C.ArayaAreeda, J. S.J. S.AreedaArene, M.M.AreneArnaud, N.N.ArnaudArun, K. G.K. G.ArunAscenzi, S.S.AscenziAshton, G.G.AshtonAston, S. M.S. M.AstonAstone, P.P.AstoneAubin, F.F.AubinAufmuth, P.P.AufmuthAultoneal, K.K.AultonealAustin, C.C.AustinAvendano, V.V.AvendanoAvila-Alvarez, A.A.Avila-AlvarezBabak, S.S.BabakBacon, P.P.BaconBadaracco, F.F.BadaraccoBader, M. K.M.M. K.M.BaderBae, S.S.BaeBaker, P. T.P. T.BakerBaldaccini, F.F.BaldacciniBallardin, G.G.BallardinBallmer, S. W.S. W.BallmerBanagiri, S.S.BanagiriBarayoga, J. C.J. C.BarayogaBarclay, S. E.S. E.BarclayBarish, B. C.B. C.BarishBarker, D.D.BarkerBarkett, K.K.BarkettBarnum, S.S.BarnumBarone, F.F.BaroneBarr, B.B.BarrBarsotti, L.L.BarsottiBarsuglia, M.M.BarsugliaBarta, D.D.BartaBartlett, J.J.BartlettBartos, I.I.BartosBassiri, R.R.BassiriBasti, A.A.BastiBawaj, M.M.BawajBayley, J. C.J. C.BayleyBazzan, M.M.BazzanBécsy, B.B.BécsyBejger, M.M.BejgerBelahcene, I.I.BelahceneBell, A. S.A. S.BellBeniwal, D.D.BeniwalBerger, B. K.B. K.BergerBergmann, G.G.BergmannBernuzzi, S.S.BernuzziBero, J. J.J. J.BeroBerry, C. P.L.C. P.L.BerryBersanetti, D.D.BersanettiBertolini, A.A.BertoliniBetzwieser, J.J.BetzwieserBhandare, R.R.BhandareBidler, J.J.BidlerBilenko, I. A.I. A.BilenkoBilgili, S. A.S. A.BilgiliBillingsley, G.G.BillingsleyBirch, J.J.BirchBirney, R.R.BirneyBirnholtz, O.O.BirnholtzBiscans, S.S.BiscansBiscoveanu, S.S.BiscoveanuBisht, A.A.BishtBitossi, M.M.BitossiBizouard, M. A.M. A.BizouardBlackburn, J. K.J. K.BlackburnBlair, C. D.C. D.Blair2025-08-312025-08-312019-04-2010.3847/1538-4357/ab113b2-s2.0-85067178226https://d8.irins.org/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 201954122arJournal55