HD 155233 b

HD 155233 b
Discovery
Discovered by	Wittenmyer et al.
Discovery date	October 19, 2015
Detection method	Radial velocity
Designations
Alternative names	HIP 84056 b
Orbital characteristics
Semi-major axis	2.065+0.059; −0.062AU
Eccentricity	0.079+0.06; −0.053
Orbital period (sidereal)	825.8+9.9; −8.8d; 2.261+0.027; −0.024yr
Inclination	5.2°±1.1°or174.8°±1.1°
Longitude of ascending node	91°+21°; −17°
Time of periastron	2,455,368+192; −92JD
Argument of periastron	157°+44°; −50°
Star	HD 155233
Physical characteristics
Mass	31.9+8.5; −5.3MJ

HD 155233 bis a confirmedbrown dwarforbiting around theK-type giant star HD 155233every 826 days, some 244light-yearsaway.^[3]It has aminimum massof almost 3 times that of Jupiter, and so was initially thought to be agas giant exoplanetsimilar to Jupiter. However, in 2023 theinclinationand true mass of HD 155233 b were determined viaastrometry,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 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[edit]

^^a ^bWittenmyer, 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
^^a ^b ^c ^dXiao, 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.
^Vallenari, A.; et al. (Gaia collaboration) (2023)."GaiaData 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 sourceatVizieR.
^"HD 155233".NASA Exoplanet Archive.Retrieved8 July2023.
^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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[Wittenmyer2015-1] 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

[Xiao2023-2] 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.

[GaiaDR3-3] Vallenari, A.; et al. (Gaia collaboration) (2023)."GaiaData 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 sourceatVizieR.

[NasaExoplanetArchive-4] "HD 155233".NASA Exoplanet Archive.Retrieved8 July2023.

[Jones2016-5] 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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