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HD 38801 b is an extrasolar, gas giant planet located in the constellation of Orion[3] whose discovery was announced in 2009 and was made using the radial velocity method.[4] The object, with a mass roughly 12 times that of Jupiter,[4] is located 324 light years (99.4 parsecs) from Earth[5][6] orbiting 1.65 astronomical units from its G-type star, HD 38801.[4][7] HD 38801 b, besides being the only planet in its system[5] also lies within the inner habitable zone[6] and takes around 1.9 years, or 693.5 days to complete a full orbit.[4]

HD 38801 b
Discovery[1]
Discovered byHarakawa et al.
Discovery siteSubaru Telescope
and Keck Observatory
Discovery date2010
Detection method
Doppler spectroscopy
Orbital characteristics[2]
Semi-major axis
1.66±0.11 AU
Eccentricity0.059±0.026
Orbital period (sidereal)
686.8±1.4 d
Time of perihelion
2453849±27 JD
Argument of perihelion
296±14 º
Semi-amplitude196.3±3.8 m/s
StarHD 38801
Physical characteristics[2]
Mass≥10.13±23 MJ

    Hd 38801 b is characterized by its uniquely low eccentricity values, or having a near circular orbit. As a super massive planet with an orbital period of hundreds of days, this occurrence is quite uncommon.[1]

    A low eccentricity orbit.
    A low eccentricity orbit.

    References


    1. Harakawa, Hiroki; et al. (2010). "Detection of a Low-eccentricity and Super-massive Planet to the Subgiant HD 38801". The Astrophysical Journal. 715 (1): 550–553. arXiv:1004.1779. Bibcode:2010ApJ...715..550H. doi:10.1088/0004-637X/715/1/550.
    2. Luhn, Jacob K.; et al. (2019). "Retired A Stars and Their Companions. VIII. 15 New Planetary Signals around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts". The Astronomical Journal. 157 (4). 149. arXiv:1811.03043. Bibcode:2019AJ....157..149L. doi:10.3847/1538-3881/aaf5d0.
    3. "Exoplorer: Hd-38801-b".
    4. "HD 38801 b – New World Atlas – Exoplanet Exploration: Planets Beyond our Solar System". Exoplanet Exploration: Planets Beyond our Solar System. Archived from the original on 2018-10-11.
    5. "Open Exoplanet Catalogue - HD 38801 B".
    6. "HD 38801". exoplanetkyoto.org.
    7. "HD 38801 b". exoplanetarchive.ipac.caltech.edu.


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