학술논문
Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model
Document Type
article
Author
Abbott, BP; Abbott, R; Abbott, TD; Abraham, S; Acernese, F; Ackley, K; Adams, C; Adhikari, RX; Adya, VB; Affeldt, C; Agathos, M; Agatsuma, K; Aggarwal, N; Aguiar, OD; Aiello, L; Ain, A; Ajith, P; Allen, G; Allocca, A; Aloy, MA; Altin, PA; Amato, A; Ananyeva, A; Anderson, SB; Anderson, WG; Angelova, SV; Antier, S; Appert, S; Arai, K; Araya, MC; Areeda, JS; Arène, M; Arnaud, N; Ascenzi, S; Ashton, G; Aston, SM; Astone, P; Aubin, F; Aufmuth, P; AultONeal, K; Austin, C; Avendano, V; Avila-Alvarez, A; Babak, S; Bacon, P; Badaracco, F; Bader, MKM; Bae, S; Baker, PT; Baldaccini, F; Ballardin, G; Ballmer, SW; Banagiri, S; Barayoga, JC; Barclay, SE; Barish, BC; Barker, D; Barkett, K; Barnum, S; Barone, F; Barr, B; Barsotti, L; Barsuglia, M; Barta, D; Bartlett, J; Bartos, I; Bassiri, R; Basti, A; Bawaj, M; Bayley, JC; Bazzan, M; Bécsy, B; Bejger, M; Belahcene, I; Bell, AS; Beniwal, D; Berger, BK; Bergmann, G; Bernuzzi, S; Bero, JJ; Berry, CPL; Bersanetti, D; Bertolini, A; Betzwieser, J; Bhandare, R; Bidler, J; Bilenko, IA; Bilgili, SA; Billingsley, G; Birch, J; Birney, R; Birnholtz, O; Biscans, S; Biscoveanu, S; Bisht, A; Bitossi, M; Bizouard, MA; Blackburn, JK; Blair, CD; Blair, DG
Source
Physical Review D. 100(12)
Subject
Language
Abstract
We present results from a semicoherent search for continuous gravitationalwaves from the low-mass X-ray binary Scorpius X-1, using a hidden Markov model(HMM) to track spin wandering. This search improves on previous HMM-basedsearches of LIGO data by using an improved frequency domain matched filter, the$\mathcal{J}$-statistic, and by analysing data from Advanced LIGO's secondobserving run. In the frequency range searched, from $60$ to$650\,\mathrm{Hz}$, we find no evidence of gravitational radiation. At$194.6\,\mathrm{Hz}$, the most sensitive search frequency, we report an upperlimit on gravitational wave strain (at 95\% confidence) of $h_0^{95\%} = 3.47\times 10^{-25}$ when marginalising over source inclination angle. This is themost sensitive search for Scorpius X-1, to date, that is specifically designedto be robust in the presence of spin wandering.