金牛座DH
金牛座DH是一顆M型恆星，距離地球140秒差距（456.619 光年）。它與相距15 角秒的金牛座DI組成聯星，並且有一顆可能是棕矮星或大質量系外行星的次恆星。
| 觀測資料 曆元 J2000.0 | |
|---|---|
| 星座 | 金牛座 |
| 星官 | |
| 赤經 | 04h 29m 41.558s[1] |
| 赤緯 | +26° 32′ 58.27″[1] |
| 視星等（V） | 13.1[2] |
| 特性 | |
| 光譜分類 | M0-M1Ve(T)[3] |
| 變星類型 | T Tau[3] |
| 天體測定 | |
| 自行 (μ) | 赤經：+7.065[4] mas/yr 赤緯：-20.699[4] mas/yr |
| 視差 (π) | 7.3880 ± .0593[4] mas |
| 距離 | 441 ± 4 ly (135 ± 1 pc) |
| 詳細資料 | |
| 質量 | 0.41[5] M☉ |
| 半徑 | 1.26[5] R☉ |
| 亮度 | 0.22[5] L☉ |
| 溫度 | 3,751[4] K |
| 年齡 | 3.16[5] Myr |
| Other designations | |
| 參考資料庫 | |
| SIMBAD | 資料 |
特性
金牛座DH是一顆M型或紅矮星恆星，是銀河系中最常見的恆星類型之一[6]。它的視星等只有13.71，因此從地球不能以裸眼直接看見，它的表面溫度為3,751 K。金牛座DH的質量為0.41 M☉，和估計它的半徑為1.26 R☉。
它的伴星金牛座DH B或金牛座DH b的質量估計在8 MJ和22 MJ之間，因此可能是顆超級木星或棕矮星[7]。其它來源給出的質量高達0.03 M☉，熱光度為0.01 L☉[8]。光譜類型被歸類為M7.5[8]或M9.25[9]。雖然主星仍然有一個原行星盤，且仍在吸積物質，但伴星被一個星周盤（可能是環行星盤，須取決於它的形成歷史）包圍[10]
參考資料
- ^ 1.0 1.1 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003). CDS/ADC Collection of Electronic Catalogues. 2003, 2246: II/246 [2023-08-19]. Bibcode:2003yCat.2246....0C. （原始內容存檔於2021-04-21）.
- ^ Ducati, J. R. VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system. VizieR On-line Data Catalog. 2002. Bibcode:2002yCat.2237....0D.
- ^ 3.0 3.1 Samus, N. N.; Durlevich, O. V.; et al. VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013). VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 2009, 1: B/gcvs. Bibcode:2009yCat....102025S.
- ^ 4.0 4.1 4.2 4.3 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365
. doi:10.1051/0004-6361/201833051. VizieR中此天體在蓋亞望遠鏡第二批數據發布的記錄
- ^ 5.0 5.1 5.2 5.3 Herczeg, Gregory J.; Hillenbrand, Lynne A. An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties. The Astrophysical Journal. 2014, 786 (2): 97. Bibcode:2014ApJ...786...97H. S2CID 36942035. arXiv:1403.1675 . doi:10.1088/0004-637X/786/2/97.
- ^ Exoplanet-catalog. Exoplanet Exploration: Planets Beyond our Solar System. [2021-03-08]. （原始內容存檔於2023-03-16）.
- ^ Xuan, Jerry W.; Bryan, Marta L.; Knutson, Heather A.; Bowler, Brendan P.; Morley, Caroline V.; Benneke, Björn. A Rotation Rate for the Planetary-mass Companion DH Tau B. The Astronomical Journal. 2020, 159 (3): 97. Bibcode:2020AJ....159...97X. S2CID 210023665. arXiv:2001.01759 . doi:10.3847/1538-3881/ab67c4.
- ^ 8.0 8.1 Ward-Duong, K.; Patience, J.; Bulger, J.; Van Der Plas, G.; Ménard, F.; Pinte, C.; Jackson, A. P.; Bryden, G.; Turner, N. J.; Harvey, P.; Hales, A.; De Rosa, R. J. The Taurus Boundary of Stellar/Substellar (TBOSS) Survey. II. Disk Masses from ALMA Continuum Observations. The Astronomical Journal. 2018, 155 (2): 54. Bibcode:2018AJ....155...54W. S2CID 55142673. arXiv:1712.07669 . doi:10.3847/1538-3881/aaa128.
- ^ Bonnefoy, M.; Chauvin, G.; Lagrange, A. -M.; Rojo, P.; Allard, F.; Pinte, C.; Dumas, C.; Homeier, D. A library of near-infrared integral field spectra of young M-L dwarfs. Astronomy and Astrophysics. 2014, 562: A127. Bibcode:2014A&A...562A.127B. S2CID 53064211. arXiv:1306.3709 . doi:10.1051/0004-6361/201118270.
- ^ Van Holstein, R. G.; Stolker, T.; Jensen-Clem, R.; Ginski, C.; Milli, J.; De Boer, J.; Girard, J. H.; Wahhaj, Z.; Bohn, A. J.; Millar-Blanchaer, M. A.; Benisty, M.; Bonnefoy, M.; Chauvin, G.; Dominik, C.; Hinkley, S.; Keller, C. U.; Keppler, M.; Langlois, M.; Marino, S.; Ménard, F.; Perrot, C.; Schmidt, T. O. B.; Vigan, A.; Zurlo, A.; Snik, F. A survey of the linear polarization of directly imaged exoplanets and brown dwarf companions with SPHERE-IRDIS. First polarimetric detections revealing disks around DH Tau B and GSC 6214-210 B. Astronomy and Astrophysics. 2021, 647: 647. Bibcode:2021A&A...647A..21V. S2CID 231573543. arXiv:2101.04033 . doi:10.1051/0004-6361/202039290.
