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HD 83443

HD 83443 is an orange dwarf star approximately 142 light-years away in the constellation of Vela. As of 2000, at least one extrasolar planet has been confirmed to be orbiting the star.

Planetary system

The planet HD 83443 b was discovered in 2000 by the Geneva Extrasolar Planet Search Team led by Michel Mayor.[1] It has a minimum mass comparable to Saturn's, and its orbit is one of the shortest known, 1/25th that of Earth's. It takes only three days to complete one revolution around the star. This hot Jupiter is likely to be slightly larger than Jupiter in radius.

In 2000, the same year that planet b was found, another planet around HD 83443 was announced by the Geneva Team. The new planet was designated as "HD 83443 c". It had a mass smaller than planet b and a short, very eccentric orbit.[2] Its orbital period, 28.9 days, was especially interesting, because it indicated a 10:1 orbital resonance between the planets. However, a team led by astronomer Paul Butler did not detect any signal indicating the existence of the second planet.[3] New observations by the Geneva team could not detect the signal either and the discovery claim had to be retracted. The origin of the signal, which was "highly significant" in the earlier data is not yet clear.[4]

The HD 83443 system[4]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity
b >0.38 MJ 0.039 2.98565 ± 0.00003 0.013 ± 0.013

References

1. ^ "Exoplanets Galore!". European Southern Observatory. 4 May 2000. http://www.eso.org/public/outreach/press-rel/pr-2000/pr-13-00.html. Retrieved 2 August 2009.
2. ^ "European Southern Observatory: Six Extrasolar Planets Discovered". SpaceRef Interactive Inc.. 7 august 2000. http://www.spaceref.com/news/viewpr.html?pid=2365. Retrieved 2 August 2009.
3. ^ Butler et al.; Marcy, Geoffrey W.; Vogt, Steven S.; Tinney, C. G.; Jones, Hugh R. A.; McCarthy, Chris; Penny, Alan J.; Apps, Kevin et al. (2002). "On the Double-Planet System around HD 83443". The Astrophysical Journal 578 (1): 565–572. doi:10.1086/342471. http://www.iop.org/EJ/article/0004-637X/578/1/565/55830.html.
4. ^ a b Mayor et al.; Udry, S.; Naef, D.; Pepe, F.; Queloz, D.; Santos, N. C.; Burnet, M. (2004). "The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE". Astronomy and Astrophysics 415: 391–402. doi:10.1051/0004-6361:20034250. http://www.aanda.org/articles/aa/full/2004/07/aa0250/aa0250.html.


External links

* "HD 83443". The Extrasolar Planets Encyclopaedia. http://exoplanet.eu/star.php?st=HD+83443. Retrieved 2008-06-11.
* "HD 83443". Extrasolar Visions. http://www.extrasolar.net/startour.asp?StarCatId=&StarId=111. Retrieved 2008-06-11.
o "HD 83443 c". Extrasolar Visions. http://www.extrasolar.net/planettour.asp?PlanetID=148. Retrieved 2008-06-11.

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