最小的系外行星列表

以下是迄今為止發現的最小的 系外行星列表，就有形的大小，按半徑排序。但其中一些未經證實和/或仍有爭議。

克卜勒-37系統中的行星和太陽系中天體的大小比較。

列表
 本表是動態列表，或許永遠不會完結。歡迎您參考可靠來源來查漏補缺。

以地球半徑為單位列出行星半徑（R地球）。所有列出的系外行星都小於地球，最大為0.7地球半徑。NASA系外行星檔案是最主要的數據來源[1][2]。

系外行星 半徑 （R地球） 註解和參考資料
SDSS J1228+1040 b
(SDSS J122859.92+104033.0 b, WD 1226+110 b)		 0.0101+0.0504
−0.0085		 Extrasolar planetesimal. Remnant iron core.[3]
PSR B1828-11 b 0.016 Unconfirmed, controversial[1]
Ceres 0.07466 Shown for comparison
WD 1145+017 b ~0.15 Extrasolar planetesimal.[4]
Pluto 0.1825 Shown for comparison
Moon 0.2739 Shown for comparison
Kepler-37b 0.296±0.037 Smallest known exoplanet.[5]
Kepler-1520b ~0.3 Disintegrating planets with poorly known radii, all thought to be smaller than Mercury.[6][7]
KOI-2700b
K2-22b
PSR B1257+12 b (Draugr) ~0.338 Least massive known exoplanet, at 0.02 Earth masses. Radius estimated from mass-radius relationship.[8]
Kepler-37e 0.37±0.18 Dubious[9]
Mercury 0.3825 Shown for comparison
Kepler-444b 0.403+0.016
−0.014		 [10]
Kepler-102b 0.47±0.02
Kepler-444c 0.497+0.021
−0.017		 [10]
Kepler-1971b (KOI-4777.01) 0.51±0.03 [11]
Kepler-1308b 0.52+0.06
−0.05
Kepler-138b 0.522±0.032
Kepler-444d 0.530+0.022
−0.019		 [10]
Mars 0.5314 Shown for comparison
Kepler-62c 0.54±0.03
Kepler-444e 0.546+0.017
−0.015		 [10]
KOI-115.03 (Kepler-105d) 0.55+0.08
−0.07		 Unconfirmed[12]
Kepler-42d 0.57±0.18
Kepler-102c 0.58±0.02
KOI-1843.03 0.59 Unconfirmed
Kepler-1583b 0.60+0.09
−0.05
Kepler-1087b 0.61+0.17
−0.05
K2-89b 0.615±0.080
Kepler-1877b 0.624
Kepler-1371c 0.64+0.07
−0.05
UCF-1.02 0.64 Dubious[13][14]
Kepler-1130d 0.645
Kepler-1351b 0.65+0.05
−0.04
Kepler-1542c 0.65+0.09
−0.06
UCF-1.01 0.65 Dubious[13][14]
Kepler-271d 0.66±0.05
Kepler-431c 0.668
Kepler-1558b 0.68+0.06
−0.04
K2-116b 0.69±0.04
Kepler-141b 0.69±0.05
K2-297b (EPIC 201497682 b) 0.692+0.059
−0.048
LHS 1678 b 0.696±0.044
Kepler-1349b 0.700+0.630
−0.110
Kepler-378c 0.70±0.05
K2-266c 0.705+0.096
−0.085
Kepler-1339b 0.71+0.06
−0.04
Gliese 367 b 0.718±0.054 Smallest known exoplanet within 10 parsecs.

相關條目

參考資料
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  6. Ansdell, M.; Hirano, T.; Gaidos, E. . Monthly Notices of the Royal Astronomical Society. 2019, 485 (3): 3876–3886. arXiv:1903.06217 可免费查阅. doi:10.1093/mnras/stz693. [...]the radii are not known but are thought to be smaller than Mercury (0.36R⊕).
  7. Garai, Z. . Astronomy & Astrophysics. 2018, 611: A63. Bibcode:2018A&A...611A..63G. S2CID 118885868. arXiv:1712.07461 可免费查阅. doi:10.1051/0004-6361/201629676. We confirmed the disintegrating-planet scenario of KOI 2700b.
  8. . [2022-11-28]. （原始内容存档于2022-02-10）.
  9. Rajpaul, V. M.; Buchhave, L. A.; Lacedelli, G.; Rice, K.; Mortier, A.; Malavolta, L.; Aigrain, S.; Borsato, L.; Mayo, A. W.; Charbonneau, D.; Damasso, M.; Dumusque, X.; Ghedina, A.; Latham, D. W.; López-Morales, M.; Magazzù, A.; Micela, G.; Molinari, E.; Pepe, F.; Piotto, G.; Poretti, E.; Rowther, S.; Sozzetti, A.; Udry, S.; Watson, C. A., , Monthly Notices of the Royal Astronomical Society, 2021, 507 (2): 1847–1868, arXiv:2107.13900 可免费查阅, doi:10.1093/mnras/stab2192
  10. Campante, T.; et al. . EPJ Web of Conferences. 2015, 101: 02004. Bibcode:2015EPJWC.10102004C. S2CID 16191462. arXiv:1501.07869 可免费查阅. doi:10.1051/epjconf/201510102004.
  11. Cañas, Caleb I.; Mahadevan, Suvrath; Cochran, William D.; Bender, Chad F.; Feigelson, Eric D.; Harman, C. E.; Kopparapu, Ravi Kumar; Caceres, Gabriel A.; Diddams, Scott A.; Endl, Michael; Ford, Eric B.; Halverson, Samuel; Hearty, Fred; Jones, Sinclaire; Kanodia, Shubham; Lin, Andrea S. J.; Metcalf, Andrew J.; Monson, Andrew; Ninan, Joe P.; Ramsey, Lawrence W.; Robertson, Paul; Roy, Arpita; Schwab, Christian; Stefánsson, Guđmundur. . The Astronomical Journal. 2022, 163 (1): 3. Bibcode:2022AJ....163....3C. S2CID 244954104. arXiv:2112.03958 可免费查阅. doi:10.3847/1538-3881/ac3088.
  12. . NASA Exoplanet Archive. [12 December 2021].
  13. Stevenson, Kevin B.; et al. . The Astrophysical Journal. 2014, 796 (1). 32. Bibcode:2014ApJ...796...32S. S2CID 118412895. arXiv:1410.0002 可免费查阅. doi:10.1088/0004-637X/796/1/32.
  14. Lanotte, A. A.; et al. . Astronomy and Astrophysics. 2014, 572. A73 [2022-11-28]. Bibcode:2014A&A...572A..73L. S2CID 55405647. arXiv:1409.4038 可免费查阅. doi:10.1051/0004-6361/201424373. （原始内容存档于2022-10-06）.
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