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.
| Discovery | |
|---|---|
| Discovered by | Silvotti et al. |
| Discovery site | Naples, Italy |
| Discovery date | March 2007 |
| Variable star timing | |
| Orbital characteristics | |
| 1.7 ± 0.1 AU (254,000,000 ± 15,000,000 km) | |
| Eccentricity | 0 |
| 1,170 ± 44 d | |
| 2,452,418 ± 96 | |
| 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 edit
- 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.
{{cite journal}}: CS1 maint: numeric names: authors list (link) - 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. S2CID 4342338.
- ^ Planet discovered that offers clues to Earth's future
- ^ 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. S2CID 119492634.
External links edit
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