HD 155233 b

HD 155233 b is a confirmed brown dwarf orbiting around the K-type giant star HD 155233 every 826 days, some 244 light-years away.[3] It has a minimum mass of almost 3 times that of Jupiter, and so was initially thought to be a gas giant exoplanet similar to Jupiter. However, in 2023 the inclination and true mass of HD 155233 b were determined via astrometry, showing it to be a brown dwarf about 32 times the mass of Jupiter in a nearly face-on orbit.[2][4]

HD 155233 b
Discovery[1]
Discovered byWittenmyer et al.
Discovery dateOctober 19, 2015
Radial velocity
Designations
HIP 84056 b
Orbital characteristics[2]
2.065+0.059
−0.062 AU
Eccentricity0.079+0.06
−0.053
825.8+9.9
−8.8 d
2.261+0.027
−0.024 yr
Inclination5.2°±1.1° or 174.8°±1.1°
91°+21°
−17°
2,455,368+192
−92 JD
157°+44°
−50°
StarHD 155233
Physical characteristics[2]
Mass31.9+8.5
−5.3 MJ

    HD 155233 b was discovered by Wittenmyer et al. in October 2015.[1] The orbit and mass were refined in 2016,[5] and again in 2023.[2]

    References
    1. Wittenmyer, R. A.; Butler, R. P.; Wang, L.; Bergmann, C.; Salter, G. S.; Tinney, C. G.; Johnson, J. A. (2015), "The Pan-Pacific Planet Search III: Five companions orbiting giant stars", Monthly Notices of the Royal Astronomical Society, 455 (2): 1398–1405, arXiv:1510.04343, doi:10.1093/mnras/stv2396
    2. Xiao, Guang-Yao; Liu, Yu-Juan; et al. (May 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics. 23 (5): 055022. arXiv:2303.12409. Bibcode:2023RAA....23e5022X. doi:10.1088/1674-4527/accb7e.
    3. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
    4. "HD 155233". NASA Exoplanet Archive. Retrieved 8 July 2023.
    5. Jones, M. I.; Jenkins, J. S.; Brahm, R.; Wittenmyer, R. A.; Olivares e., F.; Melo, C. H. F.; Rojo, P.; Jordán, A.; Drass, H.; Butler, R. P.; Wang, L. (2016), "Four new planets around giant stars and the mass-metallicity correlation of planet-hosting stars", Astronomy & Astrophysics, 590: A38, arXiv:1603.03738, Bibcode:2016A&A...590A..38J, doi:10.1051/0004-6361/201628067, S2CID 45730401
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