天兔座AF

**天兔座AF**
	天兔座AF的位置（紅圈）
觀測資料; 曆元 J2000
星座	天兔座
星官
赤經	05h 27m 04.76333s
赤緯	-11° 54′ 03.4660″
視星等（V）	6.26 - 6.35
特性
演化阶段	主序星
光谱分类	F8V(n)k:
视星等 (B)	6.832±0.015
视星等 (V)	6.295±0.010
视星等 (G)	6.209±0.003
视星等 (J)	5.268±0.027
视星等 (H)	5.087±0.026
视星等 (K)	4.926±0.021
变星类型	RS CVn
天体测定
徑向速度 (Rv)	21.10±0.37 km/s
自行 (μ)	赤经：16.915 mas/yr ; 赤纬：−49.318 mas/yr
视差 (π)	37.2539 ± 0.0195 mas
距离	87.55 ± 0.05 ly ; (26.84 ± 0.01 pc)
绝对星等 (MV)	4.14
詳細資料
質量	1.09±0.06 M☉
半徑	1.25±0.06 R☉
表面重力 (log g)	4.30±0.05
亮度 (bolometric)	1.84±0.01 L☉
溫度	6130±60 K
金属量 [Fe/H]	+0.19±0.02 dex
自轉	0.9660±0.0023 d
自轉速度 (v sin i)	50±5 km/s
年齡	24±3 Myr
其他命名
	AF Lep、NSV 16310、BD−12 1169、FK5 2409、HD 35850、HIP 25486、HR 1817、SAO 150461、PPM 215789、TYC 5340-1141-1、GSC 05340-01141、IRAS 05247-1156
參考資料庫
SIMBAD	资料

天兔座AF，也稱為HD 35850，是位於天兔座的一顆F-型主序星，距離太陽系87.5光年（26.8秒差距）。它的視星等為6.3，接近在理想條件下肉眼能見的極限。雖然一些研究認為它是一對分離僅7009314155528470000♠0.021 AU，非常靠近的光譜聯星^[8]；但其他人的研究沒有顯示聯星性質的證據，並且假設的聯興性質很可能是由於星斑的存在所產生的偽影^[9]^[4]。

天兔座AF是繪架座β移動星群的成員，其年齡年輕得驚人，僅約2,400萬歲。它擁有一個星周盤，並已知有一顆系外行星 ^[7]。

行星系統

在2023年，通過凱克天文台的儀器NIRC2，和甚大望遠鏡的光譜偏振高對比外行星研究（英语：Spectro-Polarimetric High-Contrast Exoplanet Research）（SPHERE）儀器的直接影像，在天兔座AF周圍的軌道上發現了一顆氣態巨行星的系外行星。它也在依巴谷衛星和蓋亞任務的天體量測數據中被探測到，從而可以準確量測其質量^[7]^[4]^[13]。光譜證據表明，天兔座AF b具有富含金屬的大氣層，帶有矽酸鹽雲^[6]。

已經對天兔座AF b進行了多項研究，發現了一些不同的參數。動態質量測量範圍的最新值從7000279999999999999♠2.8 M_J^[6]到 7000550000000000000♠5.5 M_J^[4]，行星的軌道傾角範圍從 6999872664625997166♠50°+9°
−12°^[7]到7000171042266695444♠~98°^[13]，與前者的恆星傾角6999942477796076940♠54°+11°
−9°一致，表明這是一個對齊的系統^[7]。所有的研究都發現這顆行星有一個相當偏心的軌道。

天兔座AF行星系統^[6]
成員 (以距離排序)	質量	半長軸 (AU)	軌道週期 (year)	離心率	傾角	半徑
b	7000279999999999999♠2.8+0.6 −0.5 M_J	7000819999999999999♠8.2+1.3 −1.7	7001223000000000000♠22.3+5.6 −6.7	6999400000000000000♠0.4+0.3 −0.2	7001550000000000000♠55+8 −13°	1.2-1.55 R_J
星周盤	— AU				—	—

參考資料

^ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211 . doi:10.1051/0004-6361/202243940 . 已忽略未知参数|collaboration= (帮助) Gaia DR3 record for this source at VizieR.
^ ^2.0 ^2.1 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.
^ Gray, R. O.; Corbally, C. J.; et al. Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample. The Astronomical Journal. July 2006, 132 (1): 161–170. Bibcode:2006AJ....132..161G. S2CID 250741593. arXiv:astro-ph/0603770 . doi:10.1086/504637.
^ ^4.0 ^4.1 ^4.2 ^4.3 ^4.4 ^4.5 ^4.6 ^4.7 Mesa, D.; Gratton, R.; et al. AF Lep b: the lowest mass planet detected coupling astrometric and direct imaging data. Astronomy & Astrophysics. February 2023, 672: A93. Bibcode:2023A&A...672A..93M. S2CID 256827302. arXiv:2302.06213 . doi:10.1051/0004-6361/202345865.
^ Anderson, E.; Francis, Ch. XHIP: An extended hipparcos compilation. Astronomy Letters. 2012, 38 (5): 331. Bibcode:2012AstL...38..331A. S2CID 119257644. arXiv:1108.4971 . doi:10.1134/S1063773712050015.
^ ^6.0 ^6.1 ^6.2 ^6.3 ^6.4 Zhang, Zhoujian; Mollière, Paul; et al. ELemental abundances of Planets and brown dwarfs Imaged around Stars (ELPIS): I. Potential Metal Enrichment of the Exoplanet AF Lep b and a Novel Retrieval Approach for Cloudy Self-luminous Atmospheres. The Astronomical Journal. September 2023, 166 (5): 198. Bibcode:2023AJ....166..198Z. arXiv:2309.02488 . doi:10.3847/1538-3881/acf768 .
^ ^7.0 ^7.1 ^7.2 ^7.3 ^7.4 ^7.5 ^7.6 ^7.7 ^7.8 Franson, Kyle; Bowler, Brendan P.; et al. Astrometric Accelerations as Dynamical Beacons: A Giant Planet Imaged Inside the Debris Disk of the Young Star AF Lep. The Astrophysical Journal Letters. February 2023, 950 (2): L19. Bibcode:2023ApJ...950L..19F. arXiv:2302.05420 . doi:10.3847/2041-8213/acd6f6 .
^ ^8.0 ^8.1 Pawellek, Nicole; Wyatt, Mark; et al. A ~75 per cent occurrence rate of debris discs around F stars in the β Pic moving group. Monthly Notices of the Royal Astronomical Society. April 2021, 502 (4): 5390–5416. Bibcode:2021MNRAS.502.5390P. arXiv:2101.12049 . doi:10.1093/mnras/stab269.
^ ^9.0 ^9.1 Järvinen, S. P.; Arlt, R.; et al. Doppler images and the underlying dynamo. The case of AF Leporis. Astronomy & Astrophysics. February 2015, 574: A25. Bibcode:2015A&A...574A..25J. S2CID 119205096. arXiv:1412.2892 . doi:10.1051/0004-6361/201424229.
^ V* AF Lep. SIMBAD. 斯特拉斯堡天文資料中心.
^ MAST: Barbara A. Mikulski Archive for Space Telescopes. Space Telescope Science Institute. [8 December 2021].
^ Spotting a hidden exoplanet. ESO. 20 February 2023.
^ ^13.0 ^13.1 De Rosa, Robert J.; Nielsen, Eric L.; et al. Direct imaging discovery of a super-Jovian around the young Sun-like star AF Leporis. Astronomy & Astrophysics. February 2023, 672: A94. Bibcode:2023A&A...672A..94D. S2CID 256827414. arXiv:2302.06332 . doi:10.1051/0004-6361/202345877.

引证错误：在<references>标签中name属性为“Pearce2022”的参考文献没有在文中使用

[GaiaDR3-1] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211 . doi:10.1051/0004-6361/202243940 . 已忽略未知参数|collaboration= (帮助) Gaia DR3 record for this source at VizieR.

[gcvs-2] 2.0 ^2.1 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.

[Gray2006-3] Gray, R. O.; Corbally, C. J.; et al. Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample. The Astronomical Journal. July 2006, 132 (1): 161–170. Bibcode:2006AJ....132..161G. S2CID 250741593. arXiv:astro-ph/0603770 . doi:10.1086/504637.

[Mesa2023-4] 4.0 ^4.1 ^4.2 ^4.3 ^4.4 ^4.5 ^4.6 ^4.7 Mesa, D.; Gratton, R.; et al. AF Lep b: the lowest mass planet detected coupling astrometric and direct imaging data. Astronomy & Astrophysics. February 2023, 672: A93. Bibcode:2023A&A...672A..93M. S2CID 256827302. arXiv:2302.06213 . doi:10.1051/0004-6361/202345865.

[xhip-5] Anderson, E.; Francis, Ch. XHIP: An extended hipparcos compilation. Astronomy Letters. 2012, 38 (5): 331. Bibcode:2012AstL...38..331A. S2CID 119257644. arXiv:1108.4971 . doi:10.1134/S1063773712050015.

[Zhang2023-6] 6.0 ^6.1 ^6.2 ^6.3 ^6.4 Zhang, Zhoujian; Mollière, Paul; et al. ELemental abundances of Planets and brown dwarfs Imaged around Stars (ELPIS): I. Potential Metal Enrichment of the Exoplanet AF Lep b and a Novel Retrieval Approach for Cloudy Self-luminous Atmospheres. The Astronomical Journal. September 2023, 166 (5): 198. Bibcode:2023AJ....166..198Z. arXiv:2309.02488 . doi:10.3847/1538-3881/acf768 .

[Franson2023-7] 7.0 ^7.1 ^7.2 ^7.3 ^7.4 ^7.5 ^7.6 ^7.7 ^7.8 Franson, Kyle; Bowler, Brendan P.; et al. Astrometric Accelerations as Dynamical Beacons: A Giant Planet Imaged Inside the Debris Disk of the Young Star AF Lep. The Astrophysical Journal Letters. February 2023, 950 (2): L19. Bibcode:2023ApJ...950L..19F. arXiv:2302.05420 . doi:10.3847/2041-8213/acd6f6 .

[Pawellek2021-8] 8.0 ^8.1 Pawellek, Nicole; Wyatt, Mark; et al. A ~75 per cent occurrence rate of debris discs around F stars in the β Pic moving group. Monthly Notices of the Royal Astronomical Society. April 2021, 502 (4): 5390–5416. Bibcode:2021MNRAS.502.5390P. arXiv:2101.12049 . doi:10.1093/mnras/stab269.

[Järvinen2015-9] 9.0 ^9.1 Järvinen, S. P.; Arlt, R.; et al. Doppler images and the underlying dynamo. The case of AF Leporis. Astronomy & Astrophysics. February 2015, 574: A25. Bibcode:2015A&A...574A..25J. S2CID 119205096. arXiv:1412.2892 . doi:10.1051/0004-6361/201424229.

[SIMBAD-10] V* AF Lep. SIMBAD. 斯特拉斯堡天文資料中心.

[MAST-11] MAST: Barbara A. Mikulski Archive for Space Telescopes. Space Telescope Science Institute. [8 December 2021].

[potw2308a-12] Spotting a hidden exoplanet. ESO. 20 February 2023.

[DeRosa2023-13] 13.0 ^13.1 De Rosa, Robert J.; Nielsen, Eric L.; et al. Direct imaging discovery of a super-Jovian around the young Sun-like star AF Leporis. Astronomy & Astrophysics. February 2023, 672: A94. Bibcode:2023A&A...672A..94D. S2CID 256827414. arXiv:2302.06332 . doi:10.1051/0004-6361/202345877.

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觀測資料曆元 J2000
天兔座AF的位置（紅圈）
星座	天兔座
星官
赤經	05^h 27^m 04.76333^s^[1]
赤緯	-11° 54′ 03.4660″^[1]
視星等（V）	6.26 - 6.35^[2]
特性
演化阶段	主序星
光谱分类	F8V(n)k:^[3]
视星等 (B)	7000683200000000000♠6.832±0.015^[4]
视星等 (V)	7000629500000000000♠6.295±0.010^[4]
视星等 (G)	7000620900000000000♠6.209±0.003^[1]
视星等 (J)	7000526800000000000♠5.268±0.027^[4]
视星等 (H)	7000508700000000000♠5.087±0.026^[4]
视星等 (K)	7000492600000000000♠4.926±0.021^[4]
变星类型	RS CVn^[2]
天体测定

徑向速度 (R_v)	7001211000000000000♠21.10±0.37^[1] km/s
自行 (μ)	赤经：7001169150000000000♠16.915 mas/yr 赤纬：2998506820000000000♠−49.318 mas/yr
视差 (π)	37.2539 ± 0.0195^[1] mas
距离	87.55 ± 0.05 ly (26.84 ± 0.01 pc)
绝对星等 (M_V)	4.14^[5]

詳細資料

質量	7000109000000000000♠1.09±0.06^[6] M_☉
半徑	7000125000000000000♠1.25±0.06^[7] R_☉
表面重力 (log g)	7000430000000000000♠4.30±0.05^[6]
亮度 (bolometric)	7000184000000000000♠1.84±0.01^[8] L_☉
溫度	7003613000000000000♠6130±60^[7] K
金属量 [Fe/H]	6999190000000000000♠+0.19±0.02^[7] dex
自轉	7004834624000000000♠0.9660±0.0023 d^[9]
自轉速度 (v sin i)	7001500000000000000♠50±5^[7] km/s
年齡	7001240000000000000♠24±3^[7] Myr

其他命名
AF Lep、NSV 16310、BD−12 1169、FK5 2409、HD 35850、HIP 25486、HR 1817、SAO 150461、PPM 215789、TYC 5340-1141-1、GSC 05340-01141、IRAS 05247-1156^[10]
參考資料庫
SIMBAD	资料

行星系統

相關條目

參考資料