2020A&A...641A.105H


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.20CEST06:31:20

2020A&A...641A.105H - Astronomy and Astrophysics, volume 641A, 105-105 (2020/9-1)

KMT-2018-BLG-0748Lb: sub-Saturn microlensing planet orbiting an ultracool host.

HAN C., SHIN I.-G., JUNG Y.K., KIM D., YEE J.C., ALBROW M.D., CHUNG S.-J., GOULD A., HWANG K.-H., LEE C.-U., RYU Y.-H., SHVARTZVALD Y., ZANG W., CHA S.-M., KIM D.-J., KIM H.-W., KIM S.-L., LEE D.-J., LEE Y., PARK B.-G. and POGGE R.W.

Abstract (from CDS):


Aims. We announce the discovery of a microlensing planetary system, in which a sub-Saturn planet is orbiting an ultracool dwarf host.
Methods. We detected the planetary system by analyzing the short-timescale (tE∼4.4-days) lensing event KMT-2018-BLG-0748. The central part of the light curve exhibits asymmetry due to negative deviations in the rising side and positive deviations in the falling side.
Results. We find that the deviations are explained by a binary-lens model with a mass ratio between the lens components of q∼2x10–3. The short event timescale, together with the small angular Einstein radius, θE∼0.11mas, indicate that the mass of the planet host is very small. The Bayesian analysis conducted under the assumption that the planet frequency is independent of the host mass indicates that the mass of the planet is Mp=0.18–0.10+0.29MJ, and the mass of the host, Mh=0.087–0.047+0.138M, is near the star-brown dwarf boundary, but the estimated host mass is sensitive to this assumption about the planet hosting probability. High-resolution follow-up observations would lead to revealing the nature of the planet host.

Abstract Copyright: © ESO 2020

Journal keyword(s): gravitational lensing: micro - planets and satellites: detection - brown dwarfs

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 - 2021
#notes
1 EWS 2012-BLG-358 BD? 17 42 46.7650230947 -24 15 39.617010912           ~ 10 1
2 NAME EWS 2012-BLG-0358b Pl 17 42 46.7650230947 -24 15 39.617010912           ~ 10 1
3 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12262 0
4 KMT-2016-BLG-1107 Lev 17 45 40.260 -26 01 54.48           ~ 5 0
5 KMT-2016-BLG-1107b Pl 17 45 40.260 -26 01 54.48           ~ 3 0
6 KMT-2018-BLG-0748b Pl? 17 51 29.880 -30 38 47.00           ~ 1 0
7 KMT-2018-BLG-0748 Lev 17 51 29.880 -30 38 47.00           ~ 2 0
8 NAME EWS 2015-BLG-1771b Pl? 17 55 11.76 -28 51 45.9           ~ 2 0
9 EWS 2015-BLG-1771 Lev 17 55 11.76 -28 51 45.9           ~ 2 0
10 MOA 2016-BLG-350b Pl 17 55 23.50 -30 12 26.1           ~ 15 0
11 MOA 2016-BLG-350 BD? 17 55 23.50 -30 12 26.1           ~ 20 0
12 MOA 2013-BLG-605b Pl 17 58 42.880 -29 23 53.60           ~ 4 0
13 MOA 2013-BLG-605 * 17 58 42.880 -29 23 53.60           ~ 10 0
14 NAME EWS 2017-BLG-1522b Pl 18 01 16.65 -28 27 43.1           ~ 4 0
15 EWS 2017-BLG-1522 * 18 01 16.65 -28 27 43.1           ~ 3 0
16 MOA 2013-BLG-220b Pl? 18 03 56.470 -29 32 40.78           ~ 5 0
17 EWS 2005-BLG-169 * 18 06 05.32 -30 43 57.5     20.4     ~ 57 1
18 MOA 2007-BLG-192b Pl 18 08 03.798 -27 09 00.27           ~ 26 1
19 MOA 2007-BLG-192 * 18 08 03.798 -27 09 00.27           ~ 39 1
20 TRAPPIST-1 LM* 23 06 29.3684052886 -05 02 29.031690445     18.798 16.466 14.024 M7.5e 596 0

    Equat.    Gal    SGal    Ecl

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