Astronomy:HD 155233 b
From HandWiki
| Discovery[1] | |
|---|---|
| Discovered by | Wittenmyer et al. |
| Discovery date | October 19, 2015 |
| Radial velocity | |
| Designations | |
| HIP 84056 b | |
| Orbital characteristics[2] | |
| 2.065+0.059 −0.062 astronomical unit|AU | |
| Eccentricity | 0.079+0.06 −0.053 |
| Orbital period | 825.8+9.9 −8.8 d 2.261+0.027 −0.024 yr |
| Inclination | 5.2°±1.1° or 174.8°±1.1° |
| Longitude of ascending node | 91°+21° −17° |
| astron|astron|helion}} | 2,455,368+192 −92 JD |
| 157°+44° −50° | |
| Star | HD 155233 |
| Physical characteristics[2] | |
| Mass | 31.9+8.5 −5.3 Jupiter mass |
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 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
- ↑ 1.0 1.1 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, doi:10.1093/mnras/stv2396
- ↑ 2.0 2.1 2.2 2.3 Xiao, Guang-Yao et al. (May 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics 23 (5): 055022. doi:10.1088/1674-4527/accb7e. Bibcode: 2023RAA....23e5022X.
- ↑ Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ "HD 155233". NASA Exoplanet Archive. https://exoplanetarchive.ipac.caltech.edu/overview/HD%20155233.
- ↑ Jones, M. I.; Jenkins, J. S.; Brahm, R.; Wittenmyer, R. A.; Olivares e., F.; Melo, C. H. F.; Rojo, P.; Jordán, A. et al. (2016), "Four new planets around giant stars and the mass-metallicity correlation of planet-hosting stars", Astronomy & Astrophysics 590: A38, doi:10.1051/0004-6361/201628067, Bibcode: 2016A&A...590A..38J
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