2MASS J03480772−6022270
2MASS J03480772−6022270 (简写为 2MASS J0348−6022)是一颗光谱分类为T7的棕矮星，位于网罟座，距离太阳约29光年。自转周期为1.08小时，是截至2022年已确认的自转最快的棕矮星[4]。自转速度超过100公里/秒（62英里/秒）[5]。由于其快速旋转，两极略微变平，其程度与太阳系中最扁的行星土星相似。正如在其他已知的快速旋转的棕矮星中观察到的那样，它的快速旋转可能会通过其磁场中的带电粒子相互作用产生强烈的极光射电辐射[2]。
| 观测资料 历元 J2000 | |
|---|---|
| 星座 | 网罟座 |
| 星官 | |
| 赤经 | 03h 48m 07.721s[1] |
| 赤纬 | –60° 22′ 27.062″[1] |
| 视星等（V） | |
| 特性 | |
| 光谱分类 | T7[2] |
| 视星等 (J) | 15.318 ± 0.050[1] |
| 视星等 (H) | 15.559 ± 0.143[1] |
| 视星等 (K) | 15.602 ± 0.230[1] |
| 天体测定 | |
| 径向速度 (Rv) | −14.1 ± 3.7[2] km/s |
| 自行 (μ) | 赤经：–279.7 ± 0.6[3] mas/yr 赤纬：–768.5 ± 0.7[3] mas/yr |
| 视差 (π) | 110 ± 1.8[3] mas |
| 距离 | 29.7 ± 0.5 ly (9.1 ± 0.1 pc) |
| 详细资料 [2] | |
| 质量 | 0.041+0.021 −0.017 M☉ |
| 半径 | 0.093+0.016 −0.010 R☉ |
| 表面重力 (log g) | 5.1 ± 0.3 |
| 温度 | 880 ± 110 K |
| 自转 | 1.080+0.004 −0.005 h |
| 自转速度 (v sin i) | 103.5 ± 7.4 km/s |
| 年龄 | 3.5+11.5 −2.9 Gyr |
| 其他命名 | |
| 参考资料库 | |
| SIMBAD | 资料 |
| 系外行星百科 | 资料 |
注释
参考资料
- ^ 1.0 1.1 1.2 1.3 1.4 1.5 2MASS J03480772-6022270 – Brown Dwarf (M<0.08solMass). SIMBAD. Centre de données astronomiques de Strasbourg. [4 March 2021]. （原始内容存档于2023-04-17）.
- ^ 2.0 2.1 2.2 2.3 Tannock, Megan E.; Metchev, Stanimir; Heinze, Aren; Miles-Páez, Paulo A.; Gagné, Jonathan; Burgasser, Adam; et al. Weather on Other Worlds. V. The Three Most Rapidly Rotating Ultra-Cool Dwarfs. The Astronomical Journal. May 2021, 161 (5): 21. Bibcode:2021AJ....161..224T. S2CID 232105126. arXiv:2103.01990
. doi:10.3847/1538-3881/abeb67. 224.
- ^ 3.0 3.1 3.2 Kirkpatrick, J. Davy; Martin, Emily C.; Smart, Richard L.; Cayago, Alfred J.; Beichman, Charles A.; Marocco, Federico; et al. Preliminary Trigonometric Parallaxes of 184 Late-T and Y Dwarfs and an Analysis of the Field Substellar Mass Function into the "Planetary" Mass Regime. The Astrophysical Journal Supplement Series. February 2019, 240 (2): 69. Bibcode:2019ApJS..240...19K. arXiv:1812.01208 . doi:10.3847/1538-4365/aaf6af . 19.
- ^ Vos, Johanna M.; Faherty, Jacqueline K.; Gagné, Jonathan; Marley, Mark; Metchev, Stanimir; Gizis, John; et al. Let the Great World Spin: Revealing the Stormy, Turbulent Nature of Young Giant Exoplanet Analogs with the Spitzer Space Telescope. The Astrophysical Journal. January 2022, 924 (2): 24. Bibcode:2022ApJ...924...68V. S2CID 245904001. arXiv:2201.04711 . doi:10.3847/1538-4357/ac4502. 68.
- ^ Cofield, Calla. Trio of Fast-Spinning Brown Dwarfs May Reveal a Rotational Speed Limit. Jet Propulsion Laboratory (NASA). 7 April 2021 [7 April 2021]. （原始内容存档于2023-04-12）.
外部链接
- Western space scientists identify fastest-spinning "failed stars" ever found （页面存档备份，存于互联网档案馆）, Jeff Renaud, University of Western Ontario, 7 April 2021
- Caught Speeding: Clocking the Fastest-Spinning Brown Dwarfs （页面存档备份，存于互联网档案馆）, NOIRLab, 7 April 2021
- Planet 2MASS J0348-6022 （页面存档备份，存于互联网档案馆）, Extrasolar Planets Encyclopaedia