HD 179949 b

Planetbox begin
name=HD 179949 bPlanetbox star
star=HD 179949
constell=Sagittarius
RA=19^h 15^m 33.23^s
DEC=-24° 10' 45.67"
dist_ly=88.18
dist_pc=27.05
class=F8VPlanetbox orbit
semimajor=0.0443±0.0026
eccentricity=0.022±0.015
period=3.092514±0.000032
ang_dist=1.638
long_peri=192
t_peri=2,451,002.32±0.44
semi-amp=112.6±1.8Planetbox character
mass=.923±0.077Planetbox discovery
discovery_date=Dec 16, 2000
discovery_method=Radial velocity
discovery_site=Anglo-Australian
Observatory
discoverers=C. Tinney, Butler,
Marcy et al.
discovery_status=PublishedThe extrasolar planet, designated as HD 179949 b, was the first discovery by the Anglo-Australian Planet Search at the Anglo-Australian Observatory. The planet is a so-called "hot Jupiter", a Jupiter-mass planet orbiting very close to its parent star. In this case, orbital distance is almost tenth that of Mercury from the Sun. One orbital revolution lasts only about 3 days.

Its magnetic field induces a bright spot on its star at 30 degrees latitude, which rotates at 87 degrees inclination. If the planet orbited at 83-97 degrees, then its transit would be visible from Earth. The angle of inclination is therefore 83 degrees or less, but not much less; and its mass is constrained to not much more than 0.923±0.077. The planet is not tidally locked to the star. [cite journal | journal=The Astrophysical Journal| issue=597 |page=1092–1096 |year=2003 |month= November 10 | url=http://www.journals.uchicago.edu/doi/pdf/10.1086/378583 |doi=10.1086/378583 | title=EVIDENCE FOR PLANET-INDUCED CHROMOSPHERIC ACTIVITY ON HD 179949 |author=E. Shkolnik and G. A. H. Walker]

Assuming the planet is perfectly grey with no greenhouse or tidal effects, and a Bond albedo of 0.1, the temperature would be 1533 K. This is, like Tau Boötis b, hotter than the predicted temperature of HD 209458 b (1392K), and close to that of HD 149026 b, before they were measured.

No absorptive cloud deck has been detected, and so HD 179949 b lacks a stratosphere. [cite journal | journal=Monthly Notices of the Royal Astronomical Society| month=3 Oct |year=2008 | title=HD 179949b: a close orbiting extrasolar giant planet with a stratosphere?| author=J. R. Barnes "et al." |doi=10.1111/j.1365-2966.2008.13831.x |]

HD 179949 b is a candidate for "near-infrared characterisation.... with the VLTI Spectro-Imager". [cite arXiv | title=Prospects for near-infrared characterisation of hot Jupiters with the VLTI Spectro-Imager (VSI) |author=Renard, S. "et al."|year=2008| eprint=0807.3014v1 |class=astro-ph]

HD 179949 b's parent star is HD 179949.

References

*cite journal | url=http://www.journals.uchicago.edu/doi/full/10.1086/320097 | author=G. Tinney et al.| title=First Results from the Anglo-Australian Planet Search: A Brown Dwarf Candidate and a 51 Peglike Planet | journal=The Astrophysical Journal | volume=551 |year=2001 | pages=507-511| doi=10.1086/320097|
*cite journal|url=http://www.journals.uchicago.edu/doi/abs/10.1086/504701|author=Butler, R. et al.|title=Catalog of Nearby Exoplanets|journal=The Astrophysical Journal|volume=646|pages=505 – 522|year=2006|doi=10.1086/504701|format=abstract ( [http://xxx.lanl.gov/abs/astro-ph?papernum=607493 web Preprint] )

External links

* [http://www.obspm.fr/encycl/encycl.html The Extrasolar Planets Encyclopaedia] [http://www.obspm.fr/encycl/HD179949.html entry]
* [http://www.extrasolar.net Extrasolar Visions] [http://www.extrasolar.net/planettour.asp?StarCatId=normal&PlanetId=152 entry]