HD 69830 b

Planetbox begin
name=HD 69830 bPlanetbox image


caption = HD 69830 b looking at its star.
"(Artist's impression)"Planetbox star
star=HD 69830
constell=Puppis
RA=RA|08|18|23.9
DEC=DEC|-12|37|55.8
dist_ly=41
dist_pc=12.6
class=K0VPlanetbox orbit
semimajor=0.0785
eccentricity=0.1±0.04
period=8.667±0.003
ang_dist = 6.23
long_peri=340±26
t_peri=2,453,496.8±0.06
semi-amp=3.51±0.15Planetbox character
mass=>0.033
temperature=~804Planetbox discovery
discovery_date=May 18, 2006
discovery_method=Radial velocity
discoverers=Lovis et al.
discovery_status=Published

HD 69830 b is a Neptune-mass or Super-Earth mass extrasolar planet orbiting the star HD 69830. This planet is 10 times more massive than Earth, making it the least massive in the system. It also orbits quite close to its parent star and takes 8²/₃ days to complete an orbit.

This is likely to be a rocky planet, not a gas giant. If it had formed as a gas giant, it would have stayed that way. [cite journal | journal=Geophysical Research Abstracts | volume=9| issue=07850 |year=2007 | url=http://www.cosis.net/abstracts/EGU2007/07850/EGU2007-J-07850.pdf?PHPSESSID=1eb3a7a98603083dda25d18001ea2a33 | title=The impact of nonthermal loss processes on planet masses from Neptunes to Jupiters |author=H. Lammer "et al."]

If HD 69830 b is a terrestrial planet, models predict that tidal heating would produce a heat flux at the surface of about 55 W/m². This is 20 times that of Io. [cite journal|title=Tidal Heating of Extra-Solar Planets| first= Brian| last= Jackson| coauthors= Richard Greenberg, Rory Barnes| journal=ApJ| id=arXiv|0803.0026 | year=2008 ]

See also

* HD 69830 c
* HD 69830 d

References

*cite journal | url=http://www.nature.com/nature/journal/v441/n7091/abs/nature04828.html | author=Lovis et al.| title=An extrasolar planetary system with three Neptune-mass planets | journal=Nature | volume=441 |year=2006 | pages=305–309| doi=10.1038/nature04828