2020AJ....159..256H

Query : 2020AJ....159..256H

2020AJ....159..256H - Astron. J., 159, 256-256 (2020/June-0)

OGLE-2018-BLG-0677Lb: a super-earth near the Galactic bulge.

HERRERA-MARTIN A., ALBROW M.D., UDALSKI A., GOULD A., RYU Y.-H., YEE J.C., CHUNG S.-J., HAN C., HWANG K.-H., JUNG Y.K., LEE C.-U., SHIN I.-G., SHVARTZVALD Y., ZANG W., CHA S.-M., KIM D.-J., KIM H.-W., KIM S.-L., LEE D.-J., LEE Y., PARK B.-G., POGGE R.W. (The KMTNet Collaboration), SZYMANSKI M.K., MROZ P., SKOWRON J., POLESKI R., SOSZYNSKI I., KOZLOWSKI S., PIETRUKOWICZ P., ULACZYK K., RYBICKI K., IWANEK P., WRONA M. (The OGLE Collaboration)

Abstract (from CDS):

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 Mplanet=3.96–2.66+5.88M⊕. The host star has a mass of Mhost=0.12–0.08+0.14M☉. The projected separation for the inner and outer solutions are 0.63–0.17+0.20 au and 0.72–0.19+0.23 au respectively. At Δχ2=χ2(1L1S)-χ2(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."

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Gravitational microlensing exoplanet detection - Gravitational microlensing - Astrostatistics strategies - Super Earths - Exoplanets

VizieR on-line data: <Available at CDS (J/AJ/159/256): fig1.dat>

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 OGLE-2005-BLG-390 * 17 54 19.2 -30 22 38           KIII 54 1
2 KMT-2016-BLG-1816 * 17 54 58.130 -29 45 01.67           ~ 11 0
3 OGLE-2018-BLG-0677 * 17 55 00.270 -32 00 59.51           ~ 15 0
4 NAME EWS 2018-BLG-0677b Pl? 17 55 00.270 -32 00 59.51           ~ 8 0
5 MOA 2012-BLG-527 * 18 08 04.62 -29 43 53.7           ~ 28 0
6 MOA 2016-BLG-339 * 18 12 49.0702747824 -27 00 45.565682832           ~ 12 0
7 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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