Astronomy:Pi Mensae b
| Discovery | |
|---|---|
| Discovered by | Jones et al.[1] |
| Discovery site |  Anglo-AustralianTelescope |
| Discovery date | 15 October 2001 |
| Doppler spectroscopy | |
| Orbital characteristics[2] | |
| 3.31+0.13 −0.15 astronomical unit|AU | |
| Eccentricity | 0.642+0.0007 −0.0006 |
| Orbital period | 5.719 ± 0.001 years (2,088.86 ± 0.37 d) |
| Inclination | 54.4°+5.9° −3.7° |
| Longitude of ascending node | 278.5°+6.7° −9.8° |
| astron|astron|helion}} | 2456540.34±0.75 |
| 331.02°+0.23° −0.22° | |
| Semi-amplitude | 193.98+0.38 −0.38 m/s |
| Star | Pi Mensae |
| Physical characteristics[2] | |
| Mass | 12.3+1.2 −1.4 Jupiter mass |
Pi Mensae b (π Men b, π Mensae b), also known as HD 39091 b, is an extrasolar planet[3] approximately 60 light-years away in the constellation of Mensa. The planet was announced orbiting the yellow main-sequence star[4] Pi Mensae in October 2001.
Detection and discovery
On October 15, 2001, a team of astronomers including Jones, Butler, Tinney, Marcy, Penny, McCarthy, Carter, and Pourbaix announced the discovery of one of the most massive extrasolar planets that have yet been observed. It was discovered by the Anglo-Australian Planet Search team, using a Doppler spectrometer mounted on the Anglo-Australian Telescope.
Physical characteristics
Pi Mensae b has a very eccentric orbit and takes 5.72 years to revolve around the star. The semi-major axis of the planet's orbit around the star is 3.31 AU. This planet passes through the star's habitable zone at periastron (1.19 AU) while at apastron, it passes to around Jupiter-Sun distance (5.44 AU). The gravitational influence of this planet would disrupt the orbit of any potentially Earth-like planet.[2][5]
Pi Mensae b is over ten times more massive than Jupiter,[6] the most massive planet in the Solar System. It will have 10 times the surface gravity of Jupiter alone and could be incandescent (glowing).[citation needed]
In 2020, the true mass of Pi Mensae b was measured to be 14.1 |♃|J}}}}}} via astrometry. Since this is greater than 13 Jupiter masses, the object could be considered a brown dwarf.[7] The most recent astrometric results as of 2022 have revised this mass estimate slightly downward, to 12.3 |♃|J}}}}}}.[8][2]
The plane of orbit of Pi Mensae b is strongly inclined to equatorial plane of the star, with the misalignment equal to 24±4.1°.[9]
See also
References
- ↑ Jones H., Vogt S., Butler P., Marcy G., Fischer D., Pourbaix D., Apps K., & Laughlin G.
- ↑ 2.0 2.1 2.2 2.3 Feng, Fabo et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series 262 (21): 21. doi:10.3847/1538-4365/ac7e57. Bibcode: 2022ApJS..262...21F.
- ↑ Butler et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505–522. doi:10.1086/504701. Bibcode: 2006ApJ...646..505B. http://www.iop.org/EJ/article/0004-637X/646/1/505/64046.html.
- ↑ Gray, R. O. et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal 132 (1): 161–170. doi:10.1086/504637. Bibcode: 2006AJ....132..161G.
- ↑ "HD 39091". http://hzgallery.org/38_1.png.
- ↑ Jones et al. (2002). "A probable planetary companion to HD 39091 from Anglo-Australian Planet Search". Monthly Notices of the Royal Astronomical Society 333 (4): 871–875. doi:10.1046/j.1365-8711.2002.05459.x. Bibcode: 2002MNRAS.333..871J. (web Preprint)
- ↑ Damasso, M. et al. (2020), "A precise architecture characterization of theπMensae planetary system", Astronomy & Astrophysics 642: A31, doi:10.1051/0004-6361/202038416, Bibcode: 2020A&A...642A..31D
- ↑ Hatzes, Artie P. et al. (2022). "A Radial Velocity Study of the Planetary System of π Mensae: Improved Planet Parameters for π Mensae c and a Third Planet on a 125 Day Orbit". The Astronomical Journal 163 (5): 223. doi:10.3847/1538-3881/ac5dcb. Bibcode: 2022AJ....163..223H.
- ↑ Kunovac Hodžić, Vedad; Triaud, Amaury H M J.; Cegla, Heather M.; Chaplin, William J.; Davies, Guy R. (2021), "Orbital misalignment of the super-Earth π Men c with the spin of its star", Monthly Notices of the Royal Astronomical Society 502 (2): 2893–2911, doi:10.1093/mnras/stab237
External links
- "HD 39091". Exoplanets. http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+39091. Retrieved 2008-07-28.
- "Pi Mensae". SolStation. http://www.solstation.com/stars2/pimensae.htm. Retrieved 2008-07-28.
- "Pi Mensae" (in Russian). Планетные Системы. http://www.allplanets.ru/star.php?star=HD%2039091. Retrieved 2008-07-28.
Coordinates: 
05h 37m 09.89s, −80° 28′ 08.84″
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