Gamma Leonis b

Gamma1 Leonis b is an extrasolar planet located 125.5 light years away in the constellation Leo, orbiting the giant star Gamma1 Leonis.[1]

Gamma1 Leonis b
Discovery
Discovered byInwoo Han et al.[1]
Discovery site South Korea
Discovery dateNovember 6, 2009
Radial velocity
Orbital characteristics
Apastron1.36 AU (203,000,000 km)
Periastron1.02 AU (153,000,000 km)
1.19 AU (178,000,000 km)[1]
Eccentricity0.14[1]
429[1] d
1.17 y
30.3
StarGamma1 Leonis

    Discovery

    On November 6, 2009, a planetary companion around primary star Gamma1 Leonis has been announced.[1] Moreover, radial velocity variations would also hint two strong signals at 8.5 and 1340 days. The former periodicity is likely due to stellar pulsation, whereas the latter could be indicative of the presence of an additional planetary companion with 2.14 Jupiter masses, moderate eccentricity (e=0.13) and located at 2.6 Astronomical Units away from the giant star. Nevertheless, the nature of such a signal is still unclear and further investigations are needed to confirm or rule out an additional substellar companion.

    Characteristics

    The planet has a minimum mass of 8.78 Jupiter masses. The true mass, as with the majority of other extrasolar planets discovered by the radial velocity method, is unknown. [2]

    References
    1. Han, Inwoo; Lee, B. C.; Kim, K. M.; Mkrtichian, D. E.; Hatzes, A. P.; Valyavin, G. (2010). "Detection of a Planetary Companion around the giant star γ1 Leonis". Astronomy and Astrophysics. 509: A24. arXiv:0911.0968. Bibcode:2010A&A...509A..24H. doi:10.1051/0004-6361/200912536. S2CID 118962986.
    2. "The Extrasolar Planet Encyclopaedia — Gamma1 Leonis b". exoplanet.eu. Retrieved 10 September 2023.
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