Astronomy:Swift J1727.8−1613

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Short description: Ultraluminous x-ray binary

Swift J1727.8-1613 (also known as J1727) is a ultraluminous low-mass x-ray binary 8,800 light years away with an orbital period of about 7.6 hours.[1][2] The compact object in the system is a stellar-mass black hole with a mass of at least 3.12±0.10 M☉︎, in orbit with an early K-type companion star.[1][3] The black hole's relativistic jet is the most resolved continuous X-ray binary jet, and one of the most physically extended X-ray binary jets yet discovered.[1][4] The system was first detected in August 2023.[1][3]

System properties

Light curves for Swift J1727.8−1613 in four photometric bands, showing several flares. Adapted from Vincentelli et al. (2025)[5]

The system reached a peak optical magnitude of approximately 12.7, making it an interest of research into black hole x-ray binaries. In x-ray wavelengths, J1727 transitions between soft and hard x-ray states.[3] In the soft state, the X-ray emission has a spectrum suggesting a geometrically thin, optically thick accretion disk. The accretion disk is believed to extend down to the innermost stable circular orbit of the black hole.[6][2]

Relativistic jets

In August 2023, a bright outburst from the binary system was detected that would last for another 10 months.[3] This observation was suggestive of a jet oriented in the north-south direction in the hard x-ray state.[2] The jet is believed to extend for 95-160 astronomical units.[1]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Nowakowski, Tomasz (31 May 2024). "X-ray binary Swift J1727.8-1613 has a large relativistic jet, observations show". Science X Network. https://phys.org/news/2024-05-ray-binary-swift-j17278-large.html. 
  2. ↑ 2.0 2.1 2.2 Veledina, Alexandra et al. (2023). "Discovery of X-Ray Polarization from the Black Hole Transient Swift J1727.8−1613". The Astrophysical Journal Letters 958 (1): L16. doi:10.3847/2041-8213/ad0781. Bibcode: 2023ApJ...958L..16V. 
  3. ↑ 3.0 3.1 3.2 3.3 Mata Sánchez, D.; Torres, M. A. P.; Casares, J.; Muñoz-Darias, T.; Armas Padilla, M.; Yanes-Rizo, I. V. (2025). "Dynamical confirmation of a black hole in the X-ray transient Swift J1727.8−1613". Astronomy & Astrophysics 693: A129. doi:10.1051/0004-6361/202451960. Bibcode: 2025A&A...693A.129M. 
  4. ↑ Wood, Callan M.; Miller-Jones, James C. A.; Bahramian, Arash; Tingay, Steven J.; Prabu, Steve; Russell, Thomas D.; Atri, Pikky; Carotenuto, Francesco et al. (2024). "Swift J1727.8–1613 Has the Largest Resolved Continuous Jet Ever Seen in an X-Ray Binary". The Astrophysical Journal Letters 971 (1): L9. doi:10.3847/2041-8213/ad6572. Bibcode: 2024ApJ...971L...9W. 
  5. ↑ Vincentelli, F. M.; Shahbaz, T.; Casella, P.; Dhillon, V. S.; Paice, J.; Altamirano, D.; Segura, N. Castro; Fender, R. et al. (May 2025). "Sub-second optical/near-infrared quasi-periodic oscillations from the black hole X-ray transient Swift J1727.8–1613". Monthly Notices of the Royal Astronomical Society 539 (3): 2347–2361. doi:10.1093/mnras/staf600. Bibcode: 2025MNRAS.539.2347V. https://academic.oup.com/mnras/article/539/3/2347/8113289. Retrieved 5 June 2025. 
  6. ↑ Svoboda, Jiří et al. (2024). "Dramatic Drop in the X-Ray Polarization of Swift J1727.8–1613 in the Soft Spectral State". The Astrophysical Journal Letters 966 (2): L35. doi:10.3847/2041-8213/ad402e. Bibcode: 2024ApJ...966L..35S. 




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