List of exoplanets detected by microlensing

Summary

This is a list of exoplanets detected by gravitational microlensing. The phenomenon results in the background star's light being warped around a foreground object, causing a distorted image. If the foreground object is a star with an orbiting planet, we would observe an abnormally bright image. By comparing the luminosity and light distortion of the background star to theoretical models, we can estimate the planet's mass and the distance from its star.

The least massive planet detected by microlensing is KMT-2020-BLG-0414Lb, which has about the same mass as Earth. The widest separation between a planet and a star is OGLE-2008-BLG-092Lb, which is ~15 AU; the shortest separation is MOA-2015-BLG-337Lb, which is 0.24 AU. There are 7 known multi-planetary systems detected by microlensing, all of which have two planets.[1]

List edit

Yellow rows denote the members of multi-planet systems.

Planet Mass (MJ) Projected separation (AU) Period (d) Eccentricity Inclination (°) Year of discovery
OGLE-2003-BLG-235Lb 2.6 5.1 2004[2][3]
OGLE-2005-BLG-071Lb 3.5 3.6 ~ 3600 2005[4][5]
OGLE-2005-BLG-390Lb 0.017 2.1 3500 2005[6]
OGLE-2005-BLG-169Lb 0.04 2.8 3300 2006[7]
OGLE-2006-BLG-109Lb 0.727 2.3 1790 64 2008[8]
OGLE-2006-BLG-109Lc 0.271 4.5 4931 0.15 64 2008[8]
MOA-2007-BLG-192Lb 0.01 0.66 2008[9]
MOA-2007-BLG-400Lb 0.9 0.85 2008[10]
MOA-2008-BLG-310Lb 0.23 1.25 2009[11]
OGLE-2007-BLG-368Lb 0.0694 3.3 2009[12]
MOA-2009-BLG-319Lb 0.157 2.0 2010[13]
MOA-2009-BLG-387Lb 2.6 1.8 1970 2011[14]
MOA-2009-BLG-266Lb 0.0327 3.2 2780 2011[15]
MOA-2011-BLG-293Lb 2.4 1.0 2012[16]
MOA-bin-1Lb 3.7 8.3 2012[17]
MOA-2010-BLG-477Lb 1.5 2±1 2012[18]
OGLE-2012-BLG-0026Lb 0.11 3.82 ~3000 2012[19]
OGLE-2012-BLG-0026Lc 0.68 4.63 ~4000 2012[19]
MOA-2010-BLG-073Lb 11 1.21 2012[20]
OGLE-2011-BLG-0251Lb 0.53±0.21 2.72±0.75 or 1.5±0.5 2013[21]
OGLE-2012-BLG-0406Lb 2.73±0.43 3.45±0.26 2013[22]
OGLE-2012-BLG-0358Lb 1.9±0.2 0.87 2013[23]
MOA-2010-BLG-328Lb 0.03 ± 0.0075 0.92 2013[24]
MOA-2011-BLG-322Lb 11.6 4.3 2013[25]
MOA-2008-BLG-379Lb 5±2.5 4±1.6 2013[26]
MOA-2011-BLG-262Lb[note 1] ~0.053 or ~0.0015 ~0.95 or ~0.13 2013[27]
MOA-2013-BLG-220Lb 2.74 3.03 2014[28][29]
OGLE-2008-BLG-355Lb 4.6 1.7 2014[30]
OGLE-2013-BLG-0341LBb 0.00522 0.702 2014[31]
OGLE-2013-BLG-0102Lb 13.6 0.8 2014[32]
OGLE-2008-BLG-092Lb 0.137 ~18 2014[33]
OGLE-2014-BLG-0124Lb 0.51±0.16 3.1±0.5 ~2400 2014[34]
OGLE-2011-BLG-0265Lb 1.0 ± 0.3 2 2014[35]
OGLE-2012-BLG-0563Lb 0.39 0.74 2015[36]
OGLE-2015-BLG-0966Lb 0.066 2.7 2015[37]
MOA-2010-BLG-353Lb 0.27 1.72 2015[38]
MOA-2013-BLG-605Lb 0.0102 0.93 2015[39]
MOA-2011-BLG-028Lb 0.09 4.14 2015[40]
OGLE-2015-BLG-0954Lb 3.4 1.6 2016[41]
OGLE-2014-BLG-1760Lb 0.56 1.75 2016[42]
OGLE-2012-BLG-0724Lb 0.47 1.6 2016[43]
OGLE-2015-BLG-0051Lb 0.72 0.73 2016[44]
OGLE-2012-BLG-0950Lb 0.079 2.2 2016[45]
OGLE-2007-BLG-349L(AB)c 0.25 2.59 2557 2016[46]
OGLE-2014-BLG-0676Lb 3.68 4.53 2016[47]
OGLE-2016-BLG-1195Lb 0.0312 2.62 2017[48][49]
MOA-2012-BLG-505Lb 0.0211 0.9 2017[50]
MOA-2012-BLG-006Lb 8.4 10.2 2017[51]
MOA-2016-BLG-227Lb 2.8 1.39 2017[52]
OGLE-2013-BLG-0132Lb 0.29 3.6 2017[53]
OGLE-2013-BLG-1721Lb 0.64 2.6 2017[53]
OGLE-2016-BLG-0263Lb 4.1 5.4 2017[54]
OGLE-2016-BLG-0613L(AB)b 4.18 6.4 2017[55]
OGLE-2016-BLG-1190Lb 13.38 2.17 1220 0.42 41.2 2017[56]
OGLE-2017-BLG-1434Lb 0.014±0.0016 1.18±0.1 2018Udalski, A.; et al. (2018). "OGLE-2017-BLG-1434Lb: Eighth q<1×10-4 Mass-Ratio Microlens Planet Confirms Turnover in Planet Mass-Ratio Function". Acta Astronomica. 68 (1). arXiv:1802.02582. doi:10.32023/0001-5237/68.1.1. S2CID 119011208.
MOA-bin-29Lb 0.6 0.48 2019[57]
KMT-2020-BLG-0414Lb 0.00381 1.79 2021Zang, Weicheng; et al. (2021). "An Earth-mass planet in a time of COVID-19: KMT-2020-BLG-0414Lb". Research in Astronomy and Astrophysics. 21 (9): 239. arXiv:2103.01896. doi:10.1088/1674-4527/21/9/239.
KMT-2019-BLG-0371Lb 7.7 0.79 2021[58]

Candidate rogue planets edit

A number of candidate rogue planets have been detected by microlensing.

Planet Mass Year of discovery
MOA-2011-BLG-274L 0.8±0.3 MJ 2014[59]
OGLE-2016-BLG-1540L ~35 M🜨 2017[60]
OGLE-2012-BLG-1323L ~2.3 M🜨 2018[61]
OGLE-2017-BLG-0560L ~1.9 MJ 2018[61]
OGLE-2019-BLG-0551L ~7.7 M🜨 2020[62]
KMT-2019-BLG-2073L ~59 M🜨 2020[63]
OGLE-2016-BLG-1928L ~0.3 M🜨 2020[64]
KMT-2017-BLG-2820L ~8.2 M🜨 2020[65]

Unconfirmed detections edit

Some microlensing events, such as MACHO-98-BLG-35 and PA-99-N2, suggest the possible presence of a planetary companion to the lensing star, but this is unconfirmed. Since microlensing relies on a one-time chance alignment, it is likely not possible to confirm these detections.

In some cases, a planetary interpretation for a microlensing event was proposed, but has been disproven. MACHO-1997-BLG-41 was initially interpreted as a binary star system orbited by a circumbinary planet, but a different model with two stars and no planet was later found to be a better fit to the data. Similarly, OGLE-2013-BLG-0723L was initially interpreted as a binary system of a star and a brown dwarf, with a low-mass planet orbiting the brown dwarf, but a model where the system consists of two low-mass stars with no planet was found to be a better fit to the data.[66]

See also edit

Notes edit

  1. ^ The nature of the observed system is unclear. It is either a rogue planet with about 3.2 MJ masses and a 0.5 ME exomoon or a red dwarf with 18 ME planet.

References edit

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