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SWIFT J1756.9−2508 is a millisecond pulsar with a rotation frequency of 182 Hz (period of 5.4945 milliseconds). It was discovered in 2007 by the Swift Gamma-Ray Burst Explorer and found to have a companion with a mass between 0.0067 and 0.030 solar masses. It is thought that the companion is the remnant of a former companion star, now stripped down to a planetary-mass core. The pulsar is accreting mass from this companion, resulting in occasional violent outbursts from the accumulated material on the neutron star.[2][3]
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Sagittarius[1] |
| Right ascension | 17h 56m 57.200s |
| Declination | −25° 06′ 26.28″ |
| Astrometry | |
| Distance | 26,000 ly (8,000 pc) |
| Details | |
| Mass | 1.8±0.4 M☉ |
| Rotation | 5.4945054945055 ms |
| Database references | |
| SIMBAD | data |
Planetary system
editSWIFT J1756.9-2508's only known planet is notable for its orbital period of less than an hour, about 54 minutes and 43 seconds.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b | 7.8 (± 1.3) MJ | — | 0.0379907 (± 5e-07) d | — | — | — |
References
edit- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- ↑ Krimm et al. 2007.
- ↑ Krimm et al. 2009.
- ↑ "The Extrasolar Planet Encyclopaedia — SWIFT J1756-2508". Extrasolar Planets Encyclopaedia. Retrieved 2018-08-22.
- Krimm, H. A.; Markwardt, C. B.; Deloye, C. J.; Romano, P.; et al. (October 2007). "Discovery of the accretion-powered millisecond pulsar SWIFT J1756.9-2508 with a low-mass companion". Astrophysical Journal Letters. 668 (2): L147–L150. arXiv:0709.1693. Bibcode:2007ApJ...668L.147K. doi:10.1086/522959. S2CID 120700539.
- Krimm, H. A.; Markwardt, C. B.; Deloye, C. J.; Romano, P.; et al. (October 2009). "ERRATUM: Discovery of the accretion-powered millisecond pulsar SWIFT J1756.9-2508 with a low-mass companion". Astrophysical Journal Letters. 703 (2): L183. arXiv:0709.1693. Bibcode:2009ApJ...703L.183K. doi:10.1088/0004-637X/703/2/L183. S2CID 54031388.
External links
edit- Universe Today, Pulsar Has Almost Completely Devoured a Star
- SIMBAD, "SWIFT J1756.9-2508" (accessed 2010-11-06)
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