Interpretation of Strong Short-Term Central Perturbations in the Light Curves of Moderate-Magnification Microlensing Events - Astrophysics > Earth and Planetary AstrophysicsReportar como inadecuado




Interpretation of Strong Short-Term Central Perturbations in the Light Curves of Moderate-Magnification Microlensing Events - Astrophysics > Earth and Planetary Astrophysics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: To improve the planet detection efficiency, current planetary microlensingexperiments are focused on high-magnification events searching for planetarysignals near the peak of lensing light curves. However, it is known thatcentral perturbations can also be produced by binary companions and thus it isimportant to distinguish planetary signals from those induced by binarycompanions. In this paper, we analyze the light curves of microlensing eventsOGLE-2007-BLG-137-MOA-2007-BLG-091, OGLE-2007-BLG-355-MOA-2007-BLG-278, andMOA-2007-BLG-199-OGLE-2007-BLG-419, for all of which exhibit short-termperturbations near the peaks of the light curves. From detailed modeling of thelight curves, we find that the perturbations of the events are caused by binarycompanions rather than planets. From close examination of the light curvescombined with the underlying physical geometry of the lens system obtained frommodeling, we find that the short time-scale caustic-crossing feature occurringat a low or a moderate base magnification with an additional secondaryperturbation is a typical feature of binary-lens events and thus can be usedfor the discrimination between the binary and planetary interpretations.



Autor: 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. Soszy

Fuente: https://arxiv.org/







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