INTERPRETATION OF STRONG SHORT-TERM CENTRAL PERTURBATIONS IN THE LIGHT CURVES OF MODERATE-MAGNIFICATION MICROLENSING EVENTS

C. Han, K. -H. Hwang, D. Kim, A. Udalski, F. Abe, L. A. B. Monard, J. McCormick, M. K. Szymanski, M. Kubiak, G. Pietrzynski, I. Soszynski, O. Szewczyk, L. Wyrzykowski, K. Ulaczyk, I. A. Bond, C. S. Botzler, A. Fukui, K. Furusawa, J. B. Hearnshaw, Y. ItowK. Kamiya, P. M. Kilmartin, A. Korpela, W. Lin, C. H. Ling, K. Masuda, Y. Matsubara, N. Miyake, Y. Muraki, M. Nagaya, K. Ohnishi, T. Tokumura, Y. C. Perrott, N. Rattenbury, To. Saito, T. Sako, L. Skuljan, D. S. Sullivan, T. Sumi, W. L. Sweatman, P. J. Tristram, P. C. M. Yock, W. Allen, G. W. Christie, D. L. DePoy, S. Dong, B. S. Gaudi, A. Gould, C. -U. Lee, T. Natusch, B. -G. Park, R. W. Pogge, M. D. Albrow, A. Allan, V. Batista, J. P. Beaulieu, D. P. Bennett, S. Brillant, M. Bode, D. M. Bramich, M. Burgdorf, J. A. R. Caldwell, H. Calitz, A. Cassan, E. Corrales, S. Dieters, D. D. Prester, Martin Dominik, J. Donatowicz, P. Fouque, J. Greenhill, K. Hill, M. Hoffman, K. Horne, U. G. Jorgensen, N. Kains, D. Kubas, J. B. Marquette, R. Martin, P. Meintjes, J. Menzies, K. R. Pollard, K. C. Sahu, C. Snodgrass, I. Steele, R. Street, Y. Tsapras, J. Wambsganss, A. Williams, M. Zub

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4 Citations (Scopus)

Abstract

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 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.

Original languageEnglish
Pages (from-to)1116-1121
Number of pages6
JournalAstrophysical Journal
Volume705
Issue number2
DOIs
Publication statusPublished - 10 Nov 2009

Keywords

  • gravitational lensing
  • planetary systems
  • PLANETARY SYSTEMS
  • EARTH MASS
  • DEGENERACY
  • CAUSTICS
  • HUNT
  • LENS

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