Pi Mensae b
{{Short description|Super-Jovian planet orbiting Pi Mensae}}
{{Infobox planet
| name = Pi Mensae b
| discoverer = Jones et al.Jones H., Vogt S., Butler P., Marcy G., Fischer D., Pourbaix D., Apps K., & Laughlin G.
| discovery_site = {{flagicon|Australia}} Anglo-Australian
Telescope
| discovered = 15 October 2001
| discovery_method = Doppler spectroscopy
| apsis = astron
| aphelion =
| perihelion =
| semimajor = {{val|3.31|0.13|0.15|ul=AU}}
| period = {{convert|5.719|±|0.001|yr|d|lk=on}}
| time_periastron = {{val|2456540.34|0.75}}
| eccentricity = {{val|0.642|0.0007|0.0006}}
| arg_peri = {{val|331.02|0.23|0.22|u=deg}}
| semi-amplitude = {{val|193.98|0.38|0.38|ul=m/s}}
| star = Pi Mensae
| inclination = {{val|54.4|5.9|3.7|u=deg}}
| asc_node = {{val|278.5|6.7|9.8|u=deg}}
| mass = {{val|12.3|1.2|1.4|ul=Jupiter mass}}
}}
Pi Mensae b (π Men b, π Mensae b), also known as HD 39091 b, is an extrasolar planet approximately 60 light-years away in the constellation of Mensa. The planet was announced orbiting the yellow main-sequence star{{cite journal
| display-authors=1
| last1=Gray | first1=R. O. | last2=Corbally | first2=C. J.
| last3=Garrison | first3=R. F. | last4=McFadden | first4=M. T.
| last5=Bubar | first5=E. J. | last6=McGahee | first6=C. E.
| last7=O'Donoghue | first7=A. A. | last8=Knox | first8=E. R.
| title=Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample
| journal=The Astronomical Journal
| volume=132 | issue=1 | pages=161–170 | date=July 2006
| doi=10.1086/504637 | bibcode=2006AJ....132..161G
| arxiv=astro-ph/0603770 | s2cid=250741593 }} 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.{{cite web |url=http://hzgallery.org/38_1.png |title=HD 39091 |website=hzgallery.org |access-date=4 September 2022}}
Pi Mensae b is over ten times more massive than Jupiter,{{cite journal | author=Jones | title=A probable planetary companion to HD 39091 from Anglo-Australian Planet Search | journal=Monthly Notices of the Royal Astronomical Society | volume=333 | year=2002 | pages=871–875 | doi=10.1046/j.1365-8711.2002.05459.x | last2=Paul Butler | first2=R. | last3=Tinney | first3=C. G. | last4=Marcy | first4=Geoffrey W. | last5=Penny | first5=Alan J. | last6=McCarthy | first6=Chris | last7=Carter | first7=Brad D. | last8=Pourbaix | first8=Dimitri | arxiv=astro-ph/0112084 | bibcode=2002MNRAS.333..871J | display-authors=1 | issue=4 | doi-access=free | s2cid=7583247 }} ([https://arxiv.org/abs/astro-ph/0112084 web Preprint]) 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|date=April 2010}}
In 2020, the true mass of Pi Mensae b was measured to be {{Jupiter mass|14.1|link=y}} via astrometry. Since this is greater than 13 Jupiter masses, the object could be considered a brown dwarf. The most recent astrometric results as of 2022 have revised this mass estimate slightly downward, to {{Jupiter mass|12.3|link=y}}.
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°.{{citation|arxiv=2007.11564|title=Orbital misalignment of the super-Earth π Men c with the spin of its star|year=2021|doi=10.1093/mnras/stab237 |last1=Kunovac Hodžić |first1=Vedad |last2=Triaud |first2=Amaury H M J. |last3=Cegla |first3=Heather M. |last4=Chaplin |first4=William J. |last5=Davies |first5=Guy R. |journal=Monthly Notices of the Royal Astronomical Society |volume=502 |issue=2 |pages=2893–2911 |doi-access=free }}
See also
References
{{reflist|refs=
{{cite journal |last1=Feng |first1=Fabo |last2=Butler |first2=R. Paul |display-authors=etal |date=August 2022 |title=3D Selection of 167 Substellar Companions to Nearby Stars |journal=The Astrophysical Journal Supplement Series |volume=262 |issue=21 |page=21 |doi=10.3847/1538-4365/ac7e57 |arxiv=2208.12720 |bibcode=2022ApJS..262...21F|s2cid=251864022 |doi-access=free }}
}}
External links
- {{cite web |url=http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+39091 |title=HD 39091 |accessdate=2008-07-28 |work=Exoplanets |publisher= |date= |archive-url=https://web.archive.org/web/20091125015234/http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+39091 |archive-date=2009-11-25 |url-status=dead }}
- {{cite web |url=http://www.solstation.com/stars2/pimensae.htm |title=Pi Mensae |accessdate=2008-07-28 |work=SolStation |publisher= |date= }}
- {{cite web |url=http://www.allplanets.ru/star.php?star=HD%2039091 |title=Pi Mensae |accessdate=2008-07-28 |work=Планетные Системы |publisher= |date= |language=Russian }}
{{Sky|05|37|09.89|-|80|28|08.84|59.39}}
Category:Mensa (constellation)
Category:Exoplanets discovered in 2001
Category:Exoplanets detected by radial velocity