2023AJ....166..116S

Query : 2023AJ....166..116S

2023AJ....166..116S - Astron. J., 166, 116 (2023/September-0)

OGLE-2019-BLG-0825: Constraints on the Source System and Effect on Binary-lens Parameters Arising from a Five-day Xallarap Effect in a Candidate Planetary Microlensing Event.

SATOH Y.K., KOSHIMOTO N., BENNETT D.P., SUMI T., RATTENBURY N.J., SUZUKI D., MIYAZAKI S., BOND I.A., UDALSKI A., GOULD A., BOZZA V., DOMINIK M., HIRAO Y., KONDO I., KIRIKAWA R., HAMADA R. (The Leading Authors), ABE F., BARRY R., BHATTACHARYA A., FUJII H., FUKUI A., FUJITA K., IKENO T., ISHITANI SILVA S., ITOW Y., MATSUBARA Y., MATSUMOTO S., MURAKI Y., NIWA K., OKAMURA A., OLMSCHENK G., RANC C., TODA T., TOMOYOSHI M., TRISTRAM P.J., VANDOROU A., YAMA H., YAMASHITA K. (The MOA Collaboration), MROZ P., POLESKI R., SKOWRON J., SZYMANSKI M.K., POLESKI R., SOSZYNSKI I., PIETRUKOWICZ P., KOZLOWSKI S., ULACZYK K., RYBICKI K.A., IWANEK P., WRONA M., GROMADZKI M. (The OGLE Collaboration), ALBROW M.D., CHUNG S.-J., HAN C., HWANG K.-H., KIM D., JUNG Y.K., KIM H.W., RYU Y.-H., SHIN I.-G., SHVARTZVALD Y., YANG H., YEE J.C., ZANG W., 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), JORGENSEN U.G., LONGA-PENA P., SAJADIAN S., SKOTTFELT J., SNODGRASS C., TREGLOAN-REED J., BACH-MOLLER N., BURGDORF M., D'AGO G., HAIKALA L., HITCHCOCK J., HUNDERTMARK M., KHALOUEI E., PEIXINHO N., RAHVAR S., SOUTHWORTH J., SPYRATOS P. (The MiNDSTEp Collaboration)

Abstract (from CDS):

We present an analysis of microlensing event OGLE-2019-BLG-0825. This event was identified as a planetary candidate by preliminary modeling. We find that significant residuals from the best-fit static binary-lens model exist and a xallarap effect can fit the residuals very well and significantly improves χ2 values. On the other hand, by including the xallarap effect in our models, we find that binary-lens parameters such as mass ratio, q, and separation, s, cannot be constrained well. However, we also find that the parameters for the source system such as the orbital period and semimajor axis are consistent between all the models we analyzed. We therefore constrain the properties of the source system better than the properties of the lens system. The source system comprises a G-type main-sequence star orbited by a brown dwarf with a period of P ∼ 5 days. This analysis is the first to demonstrate that the xallarap effect does affect binary-lens parameters in planetary events. It would not be common for the presence or absence of the xallarap effect to affect lens parameters in events with long orbital periods of the source system or events with transits to caustics, but in other cases, such as this event, the xallarap effect can affect binary-lens parameters.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Gravitational microlensing - Brown dwarfs - Xallarap effect

VizieR on-line data: <Available at CDS (J/AJ/166/116): fig1.dat>

CDS comments: 17 52 21.62 -30 48 13.2 2023AJ....166..116S

Simbad objects: 8

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Number of rows : 8
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 Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
2 OGLE-2019-BLG-0825 Lev 17 52 21.62 -30 48 13.2           ~ 2 0
3 NAME EWS 2019-BLG-0825b Pl? 17 52 21.62 -30 48 13.2           ~ 1 0
4 MOA 2013-BLG-551b Pl 17 55 31.980 -29 15 13.80           ~ 4 0
5 MOA 2013-BLG-551 * 17 55 31.980 -29 15 13.80           ~ 13 0
6 NAME Baade Window reg 18 03.5 -30 01           ~ 643 3
7 MOA 2006-BLG-74 * 18 05 27.341 -31 47 17.68           ~ 2 0
8 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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