Swift J1727.8−1613
 Light curves for Swift J1727.8−1613 in four photometric bands, showing several flares. Credit: Adapted from Vincentelli et al. (2025)[1] | |
| Swift J1727.8-1613 | |
| Right ascension | 17h 27m 43.3135483931s[2] |
|---|---|
| Declination | −16° 12′ 19.062182343″[2] |
| Apparent magnitude (V) | 12.7[3] |
| Characteristics | |
| Compact object | |
| Evolutionary stage | Black hole |
| Donor star | |
| Evolutionary stage | Main-sequence star |
| Spectral type | K4V[3] |
| Astrometry | |
| Distance | 8800 ly (2698 pc) |
| Orbit | |
| Period (P) | 7.6 hours[4][5] |
| Inclination (i) | 30-60[5]° |
| Details | |
| Black hole | |
| Mass | >3.12±0.10[3] M☉ |
Swift J1727.8-1613 (also known as J1727) is a ultraluminous low-mass x-ray binary 8,800 light years (2,698 parsecs) away with an orbital period of about 7.6 hours.[4][5] 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.[4][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.[4][6] The system was first detected in August 2023.[4][3]
System properties
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.[7][5]
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.[5] The jet is believed to extend for 95-160 astronomical units.[4]
References
- ↑ Vincentelli, F. M.; Shahbaz, T.; Casella, P.; Dhillon, V. S.; Paice, J.; Altamirano, D.; Segura, N. Castro; Fender, R.; Gandhi, P.; Littlefair, S.; Maccarone, T.; Malzac, J.; O’Brien, K.; Russell, D. M.; Tetarenko, A. J.; Uttley, P.; Veledina, A. (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. arXiv:2503.20862. Bibcode:2025MNRAS.539.2347V. doi:10.1093/mnras/staf600. Retrieved 5 June 2025.
- 1 2 "Swift J1727.8-1613". SIMBAD. Retrieved 2026-08-07.
- 1 2 3 4 5 6 7 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. arXiv:2408.13310. Bibcode:2025A&A...693A.129M. doi:10.1051/0004-6361/202451960.
- 1 2 3 4 5 6 Nowakowski, Tomasz (31 May 2024). "X-ray binary Swift J1727.8-1613 has a large relativistic jet, observations show". Phys.org. Science X Network. Retrieved 2 June 2025.
- 1 2 3 4 5 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. arXiv:2309.15928. Bibcode:2023ApJ...958L..16V. doi:10.3847/2041-8213/ad0781.
- ↑ Wood, Callan M.; Miller-Jones, James C. A.; Bahramian, Arash; Tingay, Steven J.; Prabu, Steve; Russell, Thomas D.; Atri, Pikky; Carotenuto, Francesco; Altamirano, Diego; Motta, Sara E.; Hyland, Lucas; Reynolds, Cormac; Weston, Stuart; Fender, Rob; Körding, Elmar; Maitra, Dipankar; Markoff, Sera; Migliari, Simone; Russell, David M.; Sarazin, Craig L.; Sivakoff, Gregory R.; Soria, Roberto; Tetarenko, Alexandra J.; Tudose, Valeriu (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. arXiv:2405.12370. Bibcode:2024ApJ...971L...9W. doi:10.3847/2041-8213/ad6572.
- ↑ 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. arXiv:2403.04689. Bibcode:2024ApJ...966L..35S. doi:10.3847/2041-8213/ad402e.