2009ApJ...705.1116H

Query : 2009ApJ...705.1116H

2009ApJ...705.1116H - Astrophys. J., 705, 1116-1121 (2009/November-2)

Interpretation of strong short-term central perturbations in the light curves of moderate-magnification microlensing events.

HAN C., HWANG K.-H., KIM D., UDALSKI A., ABE F., MONARD L.A.B., McCORMICK J., SZYMANSKI M.K., KUBIAK M., PIETRZYNSKI G., SOSZYNSKI I., SZEWCZYK O., WYRZYKOWSKI L., ULACZYK K. (The OGLE Collaboration), BOND I.A., BOTZLER C.S., FUKUI A., FURUSAWA K., HEARNSHAW J.B., ITOW Y., KAMIYA K., KILMARTIN P.M., KORPELA A., LIN W., LING C.H., MASUDA K., MATSUBARA Y., MIYAKE N., MURAKI Y., NAGAYA M., OHNISHI K., TOKUMURA T., PERROTT Y.C., RATTENBURY N., SAITO T., SAKO T., SKULJAN L., SULLIVAN D.S., SUMI T., SWEATMAN W.L., TRISTRAM P.J., YOCK P.C.M. (The MOA Collaboration), ALLEN W., CHRISTIE G.W., DEPOY D.L., DONG S., GAUDI B.S., GOULD A., LEE C.-U., NATUSCH T., PARK B.-G., POGGE R.W. (The {mu}FUN Collaboration), ALBROW M.D., ALLAN A., BATISTA V., BEAULIEU J.P., BENNETT D.P., BRILLANT S., BODE M., BRAMICH D.M., BURGDORF M., CALDWELL J.A.R., CALITZ H., CASSAN A., CORRALES E., DIETERS S., DOMINIS PRESTER D., DOMINIK M., DONATOWICZ J., FOUQUE P., GREENHILL J., HILL K., HOFFMAN M., HORNE K., JORGENSEN U.G., KAINS N., KUBAS D., MARQUETTE J.B., MARTIN R., MEINTJES P., MENZIES J., POLLARD K.R., SAHU K.C., SNODGRASS C., STEELE I., STREET R., TSAPRAS Y., WAMBSGANSS J., WILLIAMS A., ZUB M. (The PLANET/RoboNet Collaboration)

Abstract (from CDS):

To improve the planet detection efficiency, current planetary microlensing experiments are focused on high-magnification events searching for planetary signals near the peak of lensing light curves. However, it is known that central perturbations can also be produced by binary companions and thus it is important to distinguish planetary signals from those induced by binary companions. In this paper, we analyze the light curves of microlensing events OGLE-2007-BLG-137/MOA-2007-BLG-091, OGLE-2007-BLG-355/MOA-2007-BLG-278, and MOA-2007-BLG-199/OGLE-2007-BLG-419, for all of which exhibit short-term perturbations near the peaks of the light curves. From detailed modeling of the light curves, we find that the perturbations of the events are caused by binary companions rather than planets. From a close examination of the light curves combined with the underlying physical geometry of the lens system obtained from modeling, we find that the short timescale caustic-crossing feature occurring at a low or a moderate base magnification with an additional secondary perturbation is a typical feature of binary-lens events and thus can be used for the discrimination between the binary and planetary interpretations.

Abstract Copyright: ∼

Journal keyword(s): gravitational lensing - planetary systems

Simbad objects: 3

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Number of rows : 3
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 OGLE-2007-BLG-419 * 17 54 17.289 -29 36 09.62           ~ 1 0
2 OGLE-2007-BLG-355 * 17 59 01.751 -27 32 33.28           ~ 3 0
3 OGLE-2007-BLG-137 * 18 09 30.92 -28 08 08.0           ~ 2 0

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