2018AJ....155..211H

Query : 2018AJ....155..211H

2018AJ....155..211H - Astron. J., 155, 211-211 (2018/May-0)

OGLE-2017-BLG-0482Lb: a microlensing super-Earth orbiting a low-mass host star.

HAN C., HIRAO Y., UDALSKI A., LEE C.-U., BOZZA V., GOULD A., ABE F., BARRY R., BOND I.A., BENNETT D.P., BHATTACHARYA A., DONACHIE M., EVANS P., FUKUI A., ITOW Y., KAWASAKI K., KOSHIMOTO N., LI M.C.A., LING C.H., MATSUBARA Y., MIYAZAKI S., MUNAKATA H., MURAKI Y., NAGAKANE M., OHNISHI K., RANC C., RATTENBURY N., SAITO T., SHARAN A., SULLIVAN D.J., SUMI T., SUZUKI D., TRISTRAM P.J., YAMADA T., YONEHARA A. (The MOA Collaboration), MROZ P., POLESKI R., KOZLOWSKI S., SOSZYNSKI I., PIETRUKOWICZ P., SKOWRON J., SZYMANSKI M.K., ULACZYK K., PAWLAK M., RYBICKI K., IWANEK P. (The OGLE Collaboration), ALBROW M.D., CHUNG S.-J., HWANG K.-H., JUNG Y.K., KIM D., KIM W.-T., KIM H.-W., RYU Y.-H., SHIN I.-G., SHVARTZVALD Y., YEE J.C., ZHU W., CHA S.-M., KIM S.-L., KIM D.-J., LEE D.-J., LEE Y., PARK B.-G., POGGE R.W. (The KMTNet Collaboration)

Abstract (from CDS):

We report the discovery of a planetary system in which a super-Earth orbits a late M-dwarf host. The planetary system was found from the analysis of the microlensing event OGLE-2017-BLG-0482, wherein the planet signal appears as a short-term anomaly to the smooth lensing light curve produced by the host. Despite its weak signal and short duration, the planetary signal was firmly detected from the dense and continuous coverage by three microlensing surveys. We find a planet/host mass ratio of q ∼ 1.4 x 10–4. We measure the microlens parallax πE from the long-term deviation in the observed lensing light curve, but the angular Einstein radius θE cannot be measured because the source trajectory did not cross the planet-induced caustic. Using the measured event timescale and the microlens parallax, we find that the masses of the planet and the host are Mp=9.0–4.5+9.0M⊕ and Mhost=0.20–0.10+0.20M☉, respectively, and the projected separation between them is a⊥=1.8–0.7+0.6 au. The estimated distance to the lens is DL=5.8–2.1+1.8 kpc. The discovery of the planetary system demonstrates that microlensing provides an important method to detect low-mass planets orbiting low-mass stars.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): gravitational lensing: micro - planetary systems

Simbad objects: 11

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Number of rows : 11
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 NAME EWS 2012-BLG-0358b Pl 17 42 46.7641762656 -24 15 39.605456196           ~ 10 1
2 MOA 2009-BLG-266b Pl 17 48 05.950 -35 00 19.48           ~ 16 1
3 NAME MOA 2013-BLG-260Bb Pl 17 52 07.49 -29 50 46.0           ~ 19 0
4 MOA 2012-BLG-505b Pl 17 52 34.340 -32 02 24.33           ~ 3 0
5 NAME EWS 2005-BLG-390b Pl 17 54 19.2 -30 22 38           ~ 80 1
6 MOA 2016-BLG-350b Pl 17 55 23.50 -30 12 26.1           ~ 20 0
7 MOA 2017-BLG-209b Pl 17 56 11.73 -30 31 42.1           ~ 4 0
8 MOA 2017-BLG-209 * 17 56 11.73 -30 31 42.1           ~ 4 0
9 MOA 2010-BLG-328b Pl 17 57 59.120 -30 42 54.63           ~ 4 0
10 MOA 2007-BLG-192b Pl 18 08 03.798 -27 09 00.27           ~ 33 1
11 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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