2022AJ....164...75B

Query : 2022AJ....164...75B

2022AJ....164...75B - Astron. J., 164, 75 (2022/September-0)

MOA-2019-BLG-008Lb: A New Microlensing Detection of an Object at the Planet/Brown Dwarf Boundary.

BACHELET E., TSAPRAS Y., GOULD A., STREET R.A., BENNETT D.P., HUNDERTMARK M.P.G., BOZZA V., BRAMICH D.M., CASSAN A., DOMINIK M., HORNE K., MAO S., SAHA A., WAMBSGANSS J., ZANG W. (The ROME/REA Collaboration), ABE F., BARRY R., BENNETT D.P., BHATTACHARYA A., BOND I.A., FUKUI A., FUJII H., HIRAO Y., ITOW Y., KIRIKAWA R., KONDO I., KOSHIMOTO N., MATSUBARA Y., MATSUMOTO S., MIYAZAKI S., MURAKI Y., OLMSCHENK G., RANC C., OKAMURA A., RATTENBURY N.J., SATOH Y., SUMI T., SUZUKI D., ISHITANI SILVA S., TODA T., TRISTRAM P.J., VANDOROU A., YAMA H. (The MOA Collaboration), ALBROW M.D., CHUNG S.-J., HAN C., HWANG K.-H., JUNG Y.K., RYU Y.-H., SHIN I.-G., SHVARTZVALD Y., YEE J.C., CHA S.-M., KIM D.-J., KIM S.-L., LEE C.-U., LEE D.-J., LEE Y., PARK B.-G., POGGE R.W. (The KMTNet Collaboration), UDALSKI A., MROZ P., POLESKI R., SKOWRON J., SZYMANSKI M.K., SOSZYNSKI I., PIETRUKOWICZ P., KOZLOWSKI S., ULACZYK K., RYBICKI K.A., IWANEK P., WRONA M., GROMADZKI M. (The OGLE Collaboration)

Abstract (from CDS):

We report on the observations, analysis and interpretation of the microlensing event MOA-2019-BLG-008. The observed anomaly in the photometric light curve is best described through a binary lens model. In this model, the source did not cross caustics and no finite-source effects were observed. Therefore, the angular Einstein ring radius θE cannot be measured from the light curve alone. However, the large event duration, tE ∼ 80 days, allows a precise measurement of the microlensing parallax πE. In addition to the constraints on the angular radius θ* and the apparent brightness Is of the source, we employ the Besançon and GalMod galactic models to estimate the physical properties of the lens. We find excellent agreement between the predictions of the two galactic models: the companion is likely a resident of the brown dwarf desert with a mass Mp ∼ 30 MJup, and the host is a main-sequence dwarf star. The lens lies along the line of sight to the Galactic bulge, at a distance of ≤4 kpc. We estimate that in about 10 yr the lens and source will be separated by ∼55 mas, and it will be possible to confirm the exact nature of the lensing system by using high-resolution imaging from ground- or space-based observatories.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanets

VizieR on-line data: <Available at CDS (J/AJ/164/75): fig2.dat>

Simbad objects: 9

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Number of rows : 9
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 NGC 6451 OpC 17 50 41.5 -30 12 50     8.2     ~ 63 0
2 OGLE-2019-BLG-0011 * 17 51 55.9223467199 -29 59 23.095862678           ~ 2 0
3 MOA 2019-BLG-8b Pl? 17 51 55.9223467199 -29 59 23.095862678           ~ 1 0
4 Cl Basel 5 err 17 52.4 -30 06           ~ 29 0
5 MOA 2011-BLG-293b Pl 17 55 39.350 -28 28 36.65           ~ 21 1
6 MOA 2014-BLG-307b Pl 18 02 29.21 -28 23 46.5           ~ 8 0
7 NAME EWS 2005-BLG-169b Pl 18 06 05.32 -30 43 57.5           ~ 42 1
8 MACHO 99-BLG-47 * ~ ~           ~ 11 0
9 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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