Precision Ephemerides for Gravitational-wave Searches - IV. Corrected and refined ephemeris for Scorpius X-1

被引：11

作者：

Killestein, T. L. ^{[1
]}

Mould, M. ^{[2
,3
]}

Steeghs, D. ^{[1
,4
]}

Casares, J. ^{[5
,6
]}

Galloway, D. K. ^{[4
,7
,8
]}

Whelan, J. T. ^{[9
,10
]}

机构：

[1] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, England

[2] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, England

[3] Univ Birmingham, Inst Gravitat Wave Astron, Birmingham B15 2TT, England

[4] Monash Univ, Sch Phys & Astron, OzGRav Monash, Clayton, Vic 3800, Australia

[5] Inst Astrofis Canarias, E-38205 Tenerife, Spain

[6] Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain

[7] Monash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia

[8] Inst Globally Distributed Open Res & Educ IGDORE, Gothenburg, Sweden

[9] Rochester Inst Technol, Sch Math Sci, Rochester, NY 14623 USA

[10] Rochester Inst Technol, Ctr Computat Relat & Gravitat, Rochester, NY 14623 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2023年 / 520卷 / 04期

基金：

美国国家科学基金会; 英国科学技术设施理事会;

关键词：

gravitational waves; techniques: radial velocities; ephemerides; stars: neutron; X-ray: individual: (Sco X-1); CROSS-CORRELATION SEARCH; X-RAY BINARIES; NEUTRON-STARS; BOWEN FLUORESCENCE; SCO X-1; SPECTROSCOPY; RADIATION; EMISSION; LIMITS; PARAMETERS;

D O I：

10.1093/mnras/stad366

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Low-mass X-ray binaries have long been theorized as potential sources of continuous gravitational-wave radiation, yet there is no observational evidence from recent LIGO/Virgo observing runs. Even for the theoretically 'loudest' source, Sco X-1, the upper limit on gravitational-wave strain has been pushed ever lower. Such searches require precise measurements of the source properties for sufficient sensitivity and computational feasibility. Collating over 20 yr of high-quality spectroscopic observations of the system, we present a precise and comprehensive ephemeris for Sco X-1 through radial velocity measurements, performing a full homogeneous re-analysis of all relevant data sets and correcting previous analyses. Our Bayesian approach accounts for observational systematics and maximizes not only precision, but also the fidelity of uncertainty estimates - crucial for informing principled continuous-wave searches. Our extensive data set and analysis also enables us to construct the highest signal-to-noise ratio, highest resolution phase-averaged spectrum of a low-mass X-ray binary to date. Doppler tomography reveals intriguing transient structures present in the accretion disc and flow driven by modulation of the accretion rate, necessitating further characterization of the system at high temporal and spectral resolution. Our ephemeris corrects and supersedes previous ephemerides, and provides a factor three reduction in the number of templates in the search space, facilitating precision searches for continuous gravitational-wave emission from Sco X-1 throughout the upcoming LIGO/Virgo/KAGRA O4 observing run and beyond.

引用

页码：5317 / 5330

页数：14

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