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V391 Pegasi b, also known as HS 2201+2610 b, is an extrasolar planet candidate orbiting the star V391 Pegasi approximately 4,570 light-years away in the constellation of Pegasus. The candidate planet was discovered by means of variable star timing, which measured anomalies in variability of the star caused by a planet. It is the first planet candidate to claim to be detected with this method. The discovery reported the planet candidate to have mass of 3.2 times Jupiter's (assuming an edge-on orbit), semi-major axis of 1.7 AU, and orbital period of 1,170 days.

V391 Pegasi b
Discovery
Discovered bySilvotti et al.
Discovery siteNaples, Italy
Discovery dateMarch 2007
Detection method
Variable star timing
Orbital characteristics
Semi-major axis
1.7 ± 0.1 AU (254,000,000 ± 15,000,000 km)
Eccentricity0
Orbital period (sidereal)
1,170 ± 44 d
Time of periastron
2,452,418 ± 96
Argument of periastron
23.5 ± 7.0
Semi-amplitude76.7
StarV391 Pegasi
Physical characteristics
Mass>3.2±0.7 MJ

    The planet candidate was discovered in March 2007 and published in September 2007. If it is confirmed, its survival would indicate that planets at Earth-like distances can survive their star's red-giant phase, though this is a much larger planet than Earth (about the same size as Jupiter and Saturn).[1] Its existence has been called into question with further monitoring of the pulsations of the star which show deviations from the predicted behavior if this were in fact a planet. The variations in the pulsations may be due to unknown stellar variability.[2]


    References


    1. Planet discovered that offers clues to Earth's future
    2. Silvotti, R.; Schuh, S.; Kim, S.-L.; Lutz, R.; Reed, M.; Benatti, S.; Janulis, R.; Lanteri, L.; Østensen, R. (2018-03-01). "The sdB pulsating star V391 Peg and its putative giant planet revisited after 13 years of time-series photometric data". Astronomy & Astrophysics. 611: A85. arXiv:1711.10942. Bibcode:2018A&A...611A..85S. doi:10.1051/0004-6361/201731473. ISSN 0004-6361.




    На других языках


    [de] V391 Pegasi b

    V391 Pegasi b ist ein möglicher Exoplanet, der den heißen Unterzwerg V391 Pegasi alle 1140 Tage umkreist. Auf Grund seiner hohen Masse wird angenommen, dass es sich um einen Gasplaneten handelt.
    - [en] V391 Pegasi b

    [ru] V391 Пегаса b

    V391 Пегаса b (HS 2201+2610 b) — экзопланета, обращающаяся вокруг белого карлика V391 Пегаса. Открыта методом тайминга звёздных пульсаций в 2007 году.



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