Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model
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Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model

  • Author(s): 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;
  • Arene, 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;
  • Becsy, 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;
  • Blair, RM;
  • Bloemen, S;
  • Bode, N;
  • Boer, M;
  • Boetzel, Y;
  • Bogaert, G;
  • Bondu, F;
  • Bonilla, E;
  • Bonnand, R;
  • Booker, P;
  • Boom, BA;
  • Booth, CD;
  • Bork, R;
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  • Bossilkov, V;
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Abstract

We present results from a semicoherent search for continuous gravitational waves 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-based searches of LIGO data by using an improved frequency domain matched filter, the $\mathcal{J}$-statistic, and by analysing data from Advanced LIGO's second observing 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 upper limit on gravitational wave strain (at 95\% confidence) of $h_0^{95\%} = 3.47 \times 10^{-25}$ when marginalising over source inclination angle. This is the most sensitive search for Scorpius X-1, to date, that is specifically designed to be robust in the presence of spin wandering.

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