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

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.

arXiv comment21 pages, 5 figures; accepted for publication in Physical Review D

References in corpus (54)

• Observation of Gravitational Waves from a Binary Black Hole Merger
• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Advanced Virgo: a 2nd generation interferometric gravitational wave detector
• GWTC-1: A Gravitational-Wave Transient Catalog of Compact Binary Mergers Observed by LIGO and Virgo during the First and Second Observing Runs
• Advanced LIGO
• GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence
• LIGO: The Laser Interferometer Gravitational-Wave Observatory
• GW150914: The Advanced LIGO Detectors in the Era of First Discoveries
• Observations of Accreting Pulsars
• Data analysis of gravitational-wave signals from spinning neutron stars. I. The signal and its detection
• Catalogue of cataclysmic binaries, low-mass X-ray binaries and related objects (Seventh edition)
• Gravitational Radiation and Rotation of Accreting Neutron Stars
• Nuclear-Powered Millisecond Pulsars and the Maximum Spin Frequency of Neutron Stars
• Deformations of Accreting Neutron Star Crusts and Gravitational Wave Emission
• Gravitational Waves from Neutron Stars with Large Toroidal B-fields
• Upper Limits on the Stochastic Gravitational-Wave Background from Advanced LIGO's First Observing Run
• Saturation of the R-mode Instability
• Detecting gravitational wave emission from the known accreting neutron stars
• Gravitational waves from neutron stars: Promises and challenges
• Maximum elastic deformations of relativistic stars
• The mass donor of Scorpius X-1 revealed
• Coherent searches for periodic gravitational waves from unknown isolated sources and Scorpius X-1: results from the second LIGO science run
• Sco X-1: The Evolution and Nature of the Twin Compact Radio Lobes
• Identification and mitigation of narrow spectral artifacts that degrade searches for persistent gravitational waves in the first two observing runs of Advanced LIGO
• Directional limits on persistent gravitational waves from Advanced LIGO's first observing run
• Gravitational wave emission from a magnetically deformed non-barotropic neutron star
• Gravitational Waves: Sources, Detectors and Searches
• Spinning down newborn neutron stars: nonlinear development of the r-mode instability
• Upper limit map of a background of gravitational waves
• Directional limits on persistent gravitational waves using LIGO S5 science data
• A radiometer for stochastic gravitational waves
• Search for gravitational waves from Scorpius X-1 in the first Advanced LIGO observing run with a hidden Markov model
• Targeted search for continuous gravitational waves: Bayesian versus maximum-likelihood statistics
• Hidden Markov model tracking of continuous gravitational waves from a neutron star with wandering spin
• Upper Limits on Gravitational Waves from Scorpius X-1 from a Model-Based Cross-Correlation Search in Advanced LIGO Data
• Gravitational radiation from pulsar glitches
• The cross-correlation search for periodic gravitational waves
• First all-sky search for continuous gravitational waves from unknown sources in binary systems
• Directed searches for continuous gravitational waves from binary systems: parameter-space metrics and optimal Scorpius X-1 sensitivity
• Estimating the sensitivity of wide-parameter-space searches for gravitational-wave pulsars
• Gravitational waves from Sco X-1: A comparison of search methods and prospects for detection with advanced detectors
• A directed search for gravitational waves from Scorpius X-1 with initial LIGO
• Continuous-wave gravitational radiation from pulsar glitch recovery
• Hidden Markov model tracking of continuous gravitational waves from a binary neutron star with wandering spin. II. Binary orbital phase tracking
• An all-sky search algorithm for continuous gravitational waves from spinning neutron stars in binary systems
• Accretion-induced spin-wandering effects on the neutron star in Scorpius X-1: Implications for continuous gravitational wave searches
• Model-Based Cross-Correlation Search for Gravitational Waves from Scorpius X-1
• Tilted torus magnetic fields in neutron stars and their gravitational wave signatures
• Gravitational radiation from nonaxisymmetric spherical Couette flow in a neutron star
• Searches for continuous gravitational waves from Scorpius X-1 and XTE J1751-305 in LIGO's sixth science run
• Implementation of the frequency-modulated sideband search method for gravitational waves from low mass X-ray binaries
• Precision ephemerides for gravitational-wave searches -- III. Revised system parameters of Sco X-1
• Hidden Markov model tracking of continuous gravitational waves from a neutron star with wandering spin. III. Rotational phase tracking
• Tuning into Scorpius X-1: adapting a continuous gravitational-wave search for a known binary system

Cited by in corpus (48)

• Science Case for the Einstein Telescope
• LIGO Detector Characterization in the Second and Third Observing Runs
• Enhancing Gravitational-Wave Science with Machine Learning
• Searches for Continuous-Wave Gravitational Radiation
• Search for anisotropic gravitational-wave backgrounds using data from Advanced LIGO and Advanced Virgo's first three observing runs
• Continuous gravitational waves from neutron stars: current status and prospects
• Parameter estimation with gravitational waves
• Searches for continuous gravitational waves from neutron stars: A twenty-year retrospective
• All-sky search in early O3 LIGO data for continuous gravitational-wave signals from unknown neutron stars in binary systems
• Search methods for continuous gravitational-wave signals from unknown sources in the advanced-detector era
• Modelling neutron star mountains
• Search for continuous gravitational waves from 20 accreting millisecond X-ray pulsars in O3 LIGO data
• Status and perspectives of Continuous Gravitational Wave searches
• Search for Continuous Gravitational Waves from Scorpius X-1 in LIGO O2 Data
• Modelling neutron star mountains in relativity
• Search for gravitational waves from Scorpius X-1 with a hidden Markov model in O3 LIGO data
• Neutron Star Crust Can Support A Large Ellipticity
• All-sky, all-frequency directional search for persistent gravitational-waves from Advanced LIGO's and Advanced Virgo's first three observing runs
• Search for gravitational waves from five low mass X-ray binaries in the second Advanced LIGO observing run with an improved hidden Markov model
• Pulsar glitch detection with a hidden Markov model
• Mountain formation by repeated, inhomogeneous crustal failure in a neutron star
• Starquakes in millisecond pulsars and gravitational waves emission
• Search for gravitational waves from twelve young supernova remnants with a hidden Markov model in Advanced LIGO's second observing run
• Hidden Markov model tracking of continuous gravitational waves from a neutron star with wandering spin. III. Rotational phase tracking
• Gravitational waves from magnetically-induced thermal neutron star mountains
• Search for continuous gravitational waves from ten H.E.S.S. sources using a hidden Markov model
• Deep exploration for continuous gravitational waves at 171--172 Hz in LIGO second observing run data
• Search for continuous gravitational waves from Fomalhaut b in the second Advanced LIGO observing run with a hidden Markov model
• Neutron Star Structure in the Minimal Gravitational Standard-Model Extension and the Implication to Continuous Gravitational Waves
• Magnetically confined mountains on accreting neutron stars with multipole magnetic fields
• Search for Gravitational Waves from Scorpius X-1 in LIGO O3 Data With Corrected Orbital Ephemeris
• A low-metallicity massive contact binary undergoing slow Case A mass transfer: A detailed spectroscopic and orbital analysis of SSN 7 in NGC 346 in the SMC
• Validating continuous gravitational-wave candidates from a semicoherent search using Doppler modulation and an effective point spread function
• Search for continuous gravitational waves from PSR J0437$-$4715 with a hidden Markov model in O3 LIGO data
• Computational Techniques for Parameter Estimation of Gravitational Wave Signals
• Graphics processing unit implementation of the F-statistic for continuous gravitational wave searches
• Anisotropic neutron star crust, solar system mountains, and gravitational waves
• Implementation of a new weave-based search pipeline for continuous gravitational waves from known binary systems
• Geometric Approach to Analytic Marginalisation of the Likelihood Ratio for Continuous Gravitational Wave Searches
• Search for continuous gravitational waves from HESS~J1427-608 with a hidden Markov model
• Search for continuous gravitational waves directed at sub-threshold radiometer candidates in O3 LIGO data
• Gravitational-wave searches in the era of Advanced LIGO and Virgo
• Searches for continuous gravitational waves from young supernova remnants in the early third observing run of Advanced LIGO and Virgo
• Continuous gravitational waves in the lab: recovering audio signals with a table-top optical microphone
• How much spin wandering can continuous gravitational wave search algorithms handle?
• Results from an Einstein@Home search for continuous gravitational waves from Cassiopeia A and Vela Jr. using LIGO O2 data
• Analysing one- and two-bit data to reduce memory requirements for F-statistic-based gravitational wave searches
• Deep searches for X-ray pulsations from Scorpius X-1 and Cygnus X-2 in support of continuous gravitational wave searches