2021AJ....162..163Z

Query : 2021AJ....162..163Z

2021AJ....162..163Z - Astron. J., 162, 163-163 (2021/October-0)

Systematic KMTNet planetary anomaly search. I. OGLE-2019-BLG-1053Lb, a buried terrestrial planet.

ZANG W., HWANG K.-H., UDALSKI A., WANG T., ZHU W., SUMI T., YEE J.C., GOULD A., MAO S., ZHANG X. (The Leading Authors), ALBROW M.D., CHUNG S.-J., HAN C., JUNG Y.K., RYU Y.-H., SHIN I.-G., SHVARTZVALD Y., CHA S.-M., KIM D.-J., KIM H.-W., KIM S.-L., LEE C.-U., LEE D.-J., LEE Y., PARK B.-G., POGGE R.W. (The KMTNet Collaboration), MROZ P., SKOWRON J., POLESKI R., SZYMANSKI M.K., SOSZYNSKI I., PIETRUKOWICZ P., KOZLOWSKI S., ULACZYK K., RYBICKI K.A., IWANEK P., WRONA M., GROMADZKI M. (The OGLE Collaboration), BOND I.A., ABE F., BARRY R., BENNETT D.P., BHATTACHARYA A., DONACHIE M., FUJII H., FUKUI A., HIRAO Y., ITOW Y., KIRIKAWA R., KONDO I., KOSHIMOTO N., LI M.C.A., MATSUBARA Y., MURAKI Y., MIYAZAKI S., OLMSCHENK G., RANC C., RATTENBURY N.J., SATOH Y., SHOJI H., ISHITANI SILVA S., SUZUKI D., TANAKA Y., TRISTRAM P.J., YAMAWAKI T., YONEHARA A. (The MOA Collaboration), BEICHMAN C.A., BRYDEN G., CALCHI NOVATI S., CAREY S., GAUDI B.S., HENDERSON C.B., JOHNSON S. (The Spitzer Team)

Abstract (from CDS):

In order to exhume the buried signatures of "missing planetary caustics" in Korea Microlensing Telescope Network (KMTNet) data, we conducted a systematic anomaly search of the residuals from point-source point-lens fits, based on a modified version of the KMTNet EventFinder algorithm. This search revealed the lowest-mass-ratio planetary caustic to date in the microlensing event OGLE-2019-BLG-1053, for which the planetary signal had not been noticed before. The planetary system has a planet-host mass ratio of q = (1.25 ± 0.13) x 10–5. A Bayesian analysis yielded estimates of the mass of the host star, Mhost=0.61–0.24+0.29M☉, the mass of its planet, Mplanet=2.48–0.98+1.19M⊕, the projected planet-host separation, a⊥=3.4–0.5+0.5 au, and the lens distance, DL=6.8–0.9+0.6 kpc. The discovery of this very-low-mass-ratio planet illustrates the utility of our method and opens a new window for a large and homogeneous sample to study the microlensing planet-host mass ratio function down to q ∼ 10–5.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Exoplanet detection methods - Gravitational microlensing exoplanet detection

VizieR on-line data: <Available at CDS (J/AJ/162/163): kmta03i.dat kmta43i.dat kmtc03i.dat kmtc43i.dat kmts03i.dat kmts43i.dat oglei.dat fig7.dat>

CDS comments: KMT-2019-BLG-2418 not identified (not enough information).

Simbad objects: 20

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Number of rows : 20
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 KMT-2018-BLG-0029 * 17 37 52.670 -27 59 04.92           ~ 18 0
2 KMT-2018-BLG-0029b Pl? 17 37 52.670 -27 59 04.92           ~ 12 0
3 OGLE-2019-BLG-0667 * 17 44 30.660 -24 12 48.38           ~ 2 0
4 NAME EWS 2005-BLG-071b Pl 17 50 09.77 -34 40 23.5           ~ 52 1
5 NAME EWS 2017-BLG-0173b Pl 17 51 52.95 -29 16 16.9           ~ 9 0
6 OGLE-2017-BLG-0173 * 17 51 52.95 -29 16 16.9           ~ 21 0
7 NAME MOA 2013-BLG-260Bb Pl 17 52 07.49 -29 50 46.0           ~ 19 0
8 NAME EWS 2006-BLG-109c Pl 17 52 34.55 -30 05 15.7           ~ 35 1
9 KMT-2019-BLG-0842b Pl? 17 53 50.030 -29 52 38.78           ~ 9 0
10 MOA 2013-BLG-551b Pl 17 55 31.980 -29 15 13.80           ~ 4 0
11 MOA 2011-BLG-293b Pl 17 55 39.350 -28 28 36.65           ~ 21 1
12 MOA 2018-BLG-145b Pl 17 56 13.3348253400 -29 11 56.615704692           ~ 7 0
13 OGLE-2019-BLG-1053 * 18 00 39.93 -27 20 29.7           ~ 12 0
14 NAME EWS 2019-BLG-1053b Pl? 18 00 39.93 -27 20 29.7           ~ 7 0
15 MOA 2007-BLG-379b Pl? 18 05 24.43 -26 25 18.8           ~ 6 1
16 MOA 2012-BLG-288b Pl 18 05 57.720 -27 42 43.20           ~ 8 0
17 KMT-2020-BLG-0414b Pl? 18 07 39.60 -28 29 06.8           ~ 12 0
18 MOA 2007-BLG-400b Pl 18 09 41.980 -29 13 26.95           ~ 35 1
19 NAME EWS 2019-BLG-0960b Pl? 18 16 03.43 -25 46 28.8           ~ 10 0
20 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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