astro.wikisort.org - MeteoriteV391 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|
Discovered by | Silvotti et al. |
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Discovery site | Naples, Italy |
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Discovery date | March 2007 |
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Detection method | Variable star timing |
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Semi-major axis | 1.7 ± 0.1 AU (254,000,000 ± 15,000,000 km) |
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Eccentricity | 0 |
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Orbital period (sidereal) | 1,170 ± 44 d |
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Time of periastron | 2,452,418 ± 96 |
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Argument of periastron | 23.5 ± 7.0 |
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Semi-amplitude | 76.7 |
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Star | V391 Pegasi |
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Mass | >3.2±0.7 MJ |
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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
- R. Silvotti; S. Schuh; R. Janulis; S. Bernabei; R. Ostensen; J.-E. Solheim; I. Bruni; R. Gualandi; T. Oswalt; A. Bonanno; B. Mignemi; the Whole Earth Telescope Xcov23 collaboration (2007). "The O-C diagram of the subdwarf B pulsating star HS2201+2610: detection of a giant planet?". ASP Conference Series. 372: 369. arXiv:astro-ph/0703753. Bibcode:2007ASPC..372..369S.
- R. Silvotti; S. Schuh; R. Janulis; J.-E. Solheim; S. Bernabei; R. Østensen; T. D. Oswalt; I. Bruni; R. Gualandi; A. Bonanno; G. Vauclair; M. Reed; C.-W. Chen; E. Leibowitz; M. Paparo; A. Baran; S. Charpinet; N. Dolez; S. Kawaler; D. Kurtz; P. Moskalik; R. Riddle & S. Zola (2007). "A giant planet orbiting the 'extreme horizontal branch' star V 391 Pegasi" (PDF). Nature. 449 (7159): 189–191. Bibcode:2007Natur.449..189S. doi:10.1038/nature06143. PMID 17851517.
External links
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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