SWIFT J1756.9−2508
From Wikipedia, the free encyclopedia
Millisecond pulsar in the constellation Sagittarius
This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations . Please help improve this article by introducing more precise citations. (December 2023) (Learn how and when to remove this message)
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 17h 56m 57.200s |
| Declination | −25° 06′ 26.28″ |
| Astrometry | |
| Distance | 8000 pc |
| Details | |
| Mass | 1.8±0.4 M☉ |
| Database references | |
| SIMBAD | data |
SWIFT J1756.9−2508 is a millisecond pulsar with a rotation frequency of 182 Hz (period of 5.5 ms). 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.
Planetary system
[edit ]SWIFT 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 ]- ^ "The Extrasolar Planet Encyclopaedia — SWIFT J1756-2508". Extrasolar Planets Encyclopaedia . Retrieved 2018年08月22日.
- H. A. Krimm; C. B. Markwardt; C. J. Deloye; P. Romano; 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.
- H. A. Krimm; C. B. Markwardt; C. J. Deloye; P. Romano; 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年11月06日)
Stub icon
This variable star–related article is a stub. You can help Wikipedia by expanding it.
