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2MASS J03480772−6022270

天球赤道座標星圖 03h 48m 07.72s, −60° 22′ 27.06″
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2MASS J03480772−6022270

2MASS所拍攝的紅外線圖像(中)
觀測資料
曆元 J2000
星座 網罟座
星官
赤經 03h 48m 07.721s[1]
赤緯 –60° 22′ 27.062″[1]
視星等(V)
特性
光譜分類T7[2]
視星等 (J)15.318 ± 0.050[1]
視星等 (H)15.559 ± 0.143[1]
視星等 (K)15.602 ± 0.230[1]
天體測定
徑向速度 (Rv)−14.1 ± 3.7[2] km/s
自行 (μ) 赤經:–279.7 ± 0.6[3] mas/yr
赤緯:–768.5 ± 0.7[3] mas/yr
視差 (π)110 ± 1.8[3] mas
距離29.7 ± 0.5 ly
(9.1 ± 0.1 pc)
詳細資料 [2]
質量0.041+0.021
−0.017
M
半徑0.093+0.016
−0.010
R
表面重力 (log g)5.1 ± 0.3
溫度880 ± 110 K
自轉1.080+0.004
−0.005
 h
自轉速度 (v sin i)103.5 ± 7.4 km/s
年齡3.5+11.5
−2.9
Gyr
其他命名
WISE J034807.33-602234.9, WISEA J034807.33-602235.2, WISEP J034807.34-602234.9, UGCS J121951.36+312849.4, TIC 237922091[1]
參考資料庫
SIMBAD資料
系外行星百科資料

2MASS J03480772−6022270 (簡寫為 2MASS J0348−6022)是一顆光譜分類為T7的棕矮星,位於網罟座,距離太陽約29光年。自轉週期為1.08小時,是截至2022年已確認的自轉最快的棕矮星[4]。自轉速度超過100公里/秒(62英里/秒)[5]。由於其快速旋轉,兩極略微變平,其程度與太陽系中最扁的行星土星相似。正如在其他已知的快速旋轉的棕矮星中觀察到的那樣,它的快速旋轉可能會通過其磁場中的帶電粒子相互作用產生強烈的極光射電輻射[2]

In this artist's impression, the brown dwarf is depicted resembling the planet Jupiter with narrow, red atmospheric bands. The object's shape is slightly flattened at its poles due to its rapid rotation.
藝術家對具有狹窄大氣帶扁棕矮星的想像圖
2MASS J0348-6022 has an oblateness comparable to those of Solar System planets Jupiter and Saturn, which spin 10 times slower than the brown dwarf.
2MASS J0348−6022與太陽系行星木星和土星的扁率和大小比較
2MASS J0348−6022預計會出現射電極光,類似於這位藝術家想像中發射射電的 T 矮星SIMP J013656.5+093347

註釋

參考資料

  1. ^ 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]. (原始內容存檔於2023-04-17). 
  2. ^ 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可免費查閱. doi:10.3847/1538-3881/abeb67. 224. 
  3. ^ 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可免費查閱. doi:10.3847/1538-4365/aaf6af可免費查閱. 19. 
  4. ^ 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可免費查閱. doi:10.3847/1538-4357/ac4502. 68. 
  5. ^ Cofield, Calla. Trio of Fast-Spinning Brown Dwarfs May Reveal a Rotational Speed Limit. Jet Propulsion Laboratory (NASA). 7 April 2021 [7 April 2021]. (原始內容存檔於2023-04-12). 

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