astro.wikisort.org - Meteorite

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 by	Silvotti et al.
Discovery site	Naples, Italy
Discovery date	March 2007
Detection method	Variable star timing
Orbital characteristics
Semi-major axis	1.7 ± 0.1 AU (254,000,000 ± 15,000,000 km)
Eccentricity	0
Orbital period (sidereal)	1,170 ± 44 d
Time of periastron	2,452,418 ± 96
Argument of periastron	23.5 ± 7.0
Semi-amplitude	76.7
Star	V391 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

• 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

• The Extrasolar Planets Encyclopaedia: Notes for planet V391 Pegasi b

На других языках

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[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.

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- [en] V391 Pegasi b

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[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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