SWIFT J1756.9−2508

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.

SWIFT J1756.9−2508
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 17h 56m 57.200s
Declination −25° 06 26.28

Planetary system

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.

The SWIFT J1756.9−2508 planetary system
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b (unconfirmed) 7.8 (± 1.3) [1] MJ 0.0379907 (± 5e-07) d[1]

References


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