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OGLE-2018-BLG-0677Lb: A Super-Earth Near the Galactic Bulge

Herrera-Martín, Antonio and Albrow, M. D. and Udalski, A. and Gould, A. and Ryu, Y.-H. and Yee, J. C. and Chung, S.-J. and Han, C. and Hwang, K.-H. and Jung, Y. K. and Lee, C.-U. and Shin, I.-G. and Shvartzvald, Y. and Zang, W. and Cha, S.-M. and Kim, D.-J. and Kim, H.-W. and Kim, S.-L. and Lee, D.-J. and Lee, Y. and Park, B.-G. and Pogge, R. W. and Szymański, M. K. and Mróz, P. and Skowron, J. and Poleski, R. and Soszyński, I. and Kozłowski, S. and Pietrukowicz, P. and Ulaczyk, K. and Rybicki, K. and Iwanek, P. and Wrona, M. (2020) OGLE-2018-BLG-0677Lb: A Super-Earth Near the Galactic Bulge. Astronomical Journal, 159 (6). Art. No. 256. ISSN 1538-3881.

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We report the analysis of the microlensing event OGLE-2018-BLG-0677. A small feature in the light curve of the event leads to the discovery that the lens is a star–planet system. Although there are two degenerate solutions that could not be distinguished for this event, both lead to a similar planet-host mass ratio. We perform a Bayesian analysis based on a Galactic model to obtain the properties of the system and find that the planet corresponds to a super-Earth/sub-Neptune with a mass of M_(planet) = 3.96^(+5.88)_(−2.66) M⊕. The host star has a mass of M_(host) = 0.12^(+0.14)_(−0.08) M⊙. The projected separation for the inner and outer solutions are 0.63^(+0.20)_(−0.17) au and 0.72^(+0.23)_(−0.19) au respectively. At Δχ² = χ² (1L1S) –χ ²(2L1S) = 46, this is by far the lowest Δχ² for any securely detected microlensing planet to date, a feature that is closely connected to the fact that it is detected primarily via a "dip" rather than a "bump."

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Herrera-Martín, Antonio0000-0002-3654-4662
Albrow, M. D.0000-0003-3316-4012
Ryu, Y.-H.0000-0001-9823-2907
Yee, J. C.0000-0001-9481-7123
Chung, S.-J.0000-0001-6285-4528
Han, C.0000-0002-2641-9964
Hwang, K.-H.0000-0002-9241-4117
Jung, Y. K.0000-0002-0314-6000
Shin, I.-G.0000-0002-4355-9838
Shvartzvald, Y.0000-0003-1525-5041
Zang, W.0000-0001-6000-3463
Kim, D.-J.0000-0001-8263-1006
Pogge, R. W.0000-0003-1435-3053
Mróz, P.0000-0001-7016-1692
Skowron, J.0000-0002-2335-1730
Pietrukowicz, P.0000-0002-2339-5899
Ulaczyk, K.0000-0001-6364-408X
Iwanek, P.0000-0002-6212-7221
Additional Information:© 2020 The American Astronomical Society. Received 2020 March 4; revised 2020 April 6; accepted 2020 April 10; published 2020 May 7. A.H.M. and M.D.A. are supported by the Marsden Fund under contract UOC1602. The OGLE project has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to A.U. W.Z. acknowledges support by the National Science Foundation of China (grant No. 11821303 and 11761131004) A.G. received support from the European Research Council under the European Unions Seventh Framework Programme (FP 7) ERC grant Agreement no. [321035] This research has made use of the KMTNet system operated by the Korea Astronomy and Space Science Institute (KASI) and the data were obtained at three host sites of CTIO in Chile, SAAO in South Africa, and SSO in Australia. Work by C.H. was supported by the grants (2017R1A4A1015178 and 2019R1A2C2085965) of National Research Foundation of Korea.
Funding AgencyGrant Number
Marsden FundUOC1602
National Science Centre (Poland)MAESTRO 2014/14/A/ST9/00121
National Natural Science Foundation of China11821303
National Natural Science Foundation of China11761131004
European Research Council (ERC)321035
National Research Foundation of Korea2017R1A4A1015178
National Research Foundation of Korea2019R1A2C2085965
Subject Keywords:Gravitational microlensing exoplanet detection ; Gravitational microlensing ; Astrostatistics strategies ; Super Earths ; Exoplanets
Issue or Number:6
Classification Code:Unified Astronomy Thesaurus concepts: Gravitational microlensing exoplanet detection (2147); Gravitational microlensing (489); Astrostatistics strategies (1885); Super Earths (1655); Exoplanets (498)
Record Number:CaltechAUTHORS:20200511-100530014
Persistent URL:
Official Citation:Antonio Herrera-Martín et al 2020 AJ 159 256
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103097
Deposited By: Tony Diaz
Deposited On:11 May 2020 17:28
Last Modified:11 May 2020 17:28

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