Talk:Scorpius X-1
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COI edit to Scorpius X-1
[edit] | The user below has a request that a significant addition or re-write be made to this article for which that user has an actual or apparent conflict of interest. The backlog is very high. Please be extremely patient. There are currently 903 requests waiting for review. Please read the instructions for the parameters used by this template for accepting and declining them, and review the request below and make the edit if it is well sourced, neutral, and follows other Wikipedia guidelines and policies. Remember to set the |answered= parameter to "yes" when the request has been accepted, rejected or on hold awaiting user input. |
- What I think should be changed (include citations):
Add new section to the article:
Candidate gravitational wave source
[edit]As the brightest non-transient X-ray source visible in the night sky, Scorpius X-1 is expected to be among the strongest continuous sources of gravitational wave emission in the Galaxy. The expected gravitational wave strain from a low mass X-ray binary is connected to the X-ray luminosity via torque balance - the neutron star in the system experiences a spin-up torque proportional to the accretion rate, which must be counterbalanced by the gravitational-wave emission to sustain a steady-state equillibrium.[1] The GW strain scales as the square root of the accretion luminosity, thus Scorpius X-1 is the strongest emitter known under the assumption of torque balance, and a core search target for gravitational wave astronomy. Detection of continuous gravitational waves would provide important constraints on the equation of state of the neutron star.
As a result, Scorpius X-1 has been the subject of intensive study by astronomers[2][3][4][5], to better characterise the orbital parameters of the binary - a critical input to gravitational wave searches to narrow the parameter space and thus computational cost and accuracy of any searches. High-resolution time-resolved optical spectroscopy of emission lines visible on the face of the donor through Bowen fluorescence[6] provide a robust tracer of the donor star's motion in the system.[5] Radio measurements of the source are also important, to constrain the inclination angle of the system.[7]
Throughout the LIGO/Virgo/KAGRA observing runs, no continuous gravitational-wave emission has been detected from Scorpius X-1[8][9][10], down to increasingly sensitive limits which push beyond the expected limits for torque balance. This represents a growing tension between theoretical expectations and observational results, whilst also placing constraints on the ellipticity and deformation of the neutron star.
- Why it should be changed:
Sco X-1 has gained new importance with the advent of gravitational-wave astronomy, and so adding a section ensures the article is up to date. I am involved with some of the searches, and am co-author on some of the papers cited, so am declaring my COI and requesting neutral editors look over the changes.
ExtantSuns (talk) 10:54, 19 August 2026 (UTC)
References
- ↑ Bildsten, Lars (1998-07-01). "Gravitational Radiation and Rotation of Accreting Neutron Stars". The Astrophysical Journal. 501 (1): L89–L93. doi:10.1086/311440.
- ↑ Cite error: The named reference
:0was invoked but never defined (see the help page). - ↑ Galloway, Duncan K.; Premachandra, Sammanani; Steeghs, Danny; Marsh, Tom; Casares, Jorge; Cornelisse, Rémon (2013-12-30). "PRECISION EPHEMERIDES FOR GRAVITATIONAL-WAVE SEARCHES. I. Sco X-1". The Astrophysical Journal. 781 (1): 14. doi:10.1088/0004-637X/781/1/14. ISSN 0004-637X.
- ↑ Wang, L; Steeghs, D; Galloway, D K; Marsh, T; Casares, J (2018). "Precision Ephemerides for Gravitational-wave Searches – III. Revised system parameters of Sco X-1". Monthly Notices of the Royal Astronomical Society. 478 (4): 5174–5183. doi:10.1093/mnras/sty1441. ISSN 0035-8711.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - 1 2 Killestein, T L; Mould, M; Steeghs, D; Casares, J; Galloway, D K; Whelan, J T (2023). "Precision Ephemerides for Gravitational-wave Searches – IV. Corrected and refined ephemeris for Scorpius X-1". Monthly Notices of the Royal Astronomical Society. 520 (4): 5317–5330. doi:10.1093/mnras/stad366. ISSN 0035-8711.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ↑ Kastner, S. O.; Bhatia, A. K. (1996-04-01). "The Bowen fluorescence lines: overview and re-analysis of the observations". Monthly Notices of the Royal Astronomical Society. 279 (4): 1137–1156. doi:10.1093/mnras/279.4.1137. ISSN 0035-8711.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ↑ Cite error: The named reference
parwas invoked but never defined (see the help page). - ↑ Aasi, J.; Abbott, B. P.; Abbott, R.; Abbott, T.; Abernathy, M. R.; Acernese, F.; Ackley, K.; Adams, C.; Adams, T.; Addesso, P.; Adhikari, R. X.; Adya, V.; Affeldt, C.; Agathos, M.; Agatsuma, K. (2015-03-26). "Directed search for gravitational waves from Scorpius X-1 with initial LIGO data". Physical Review D. 91 (6). doi:10.1103/PhysRevD.91.062008. ISSN 1550-7998.
- ↑ Abbott, R.; Abe, H.; Acernese, F.; Ackley, K.; Adhicary, S.; Adhikari, N.; Adhikari, R. X.; Adkins, V. K.; Adya, V. B.; Affeldt, C.; Agarwal, D.; Agathos, M.; Aguiar, O. D.; Aiello, L.; Ain, A. (2022). "Model-based Cross-correlation Search for Gravitational Waves from the Low-mass X-Ray Binary Scorpius X-1 in LIGO O3 Data". The Astrophysical Journal Letters. 941 (2): L30. doi:10.3847/2041-8213/aca1b0. ISSN 2041-8205.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ↑ The LIGO Scientific Collaboration; the Virgo Collaboration; the KAGRA Collaboration; Searches, the Precision Ephemerides for Gravitational-Wave (2026), Sub-Torque-Balance Upper Limits on Continuous Gravitational Waves from Scorpius X-1, arXiv, doi:10.48550/ARXIV.2607.07765, retrieved 2026-08-19
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