Variation of Spot-induced Anomalies in Caustic-crossing Binary Microlensing Event Light Curves

Abstract

We investigate the pattern of anomalies in the light curves of caustic-crossing binary microlensing events induced by spot(s) on the lensed source star. For this purpose, we perform simulations of events with various models of spots. From these simulations, we find that the spot-induced anomalies take various forms depending on the physical state of spots, which is characterized by the surface brightness contrast, the size, the number, the umbra/penumbra structure, the shape, and the orientation with respect to the sweeping caustic. We also examine the feasibility of distinguishing the two possibly degenerate types of anomalies caused by a spot and a transiting planet and find that the degeneracy in many cases can be broken from the characteristic multiple deviation feature in the spot-induced anomaly pattern caused by the multiplicity of spots.

total 6 pages, including 7 figures and no table, MNRAS, submitted

References in corpus (5)

• Real-Time Difference Imaging Analysis of MOA Galactic Bulge Observations During 2000
• Observations of the Binary Microlens Event MACHO-98-SMC-1 by the Microlensing Planet Search Collaboration
• Origin of Logarithmic Operators in Conformal Field Theories
• Spectrophotometric Resolution of Stellar Atmospheres with Microlensing
• Detection of Stellar Spots from the Observations of Caustic-Crossing Binary-Lens Gravitational Microlensing Events

Cited by in corpus (6)

• Probing Structures of Distant Extrasolar Planets with Microlensing
• Detecting stellar spots through polarimetry observations of microlensing events in caustic-crossing
• Starspot induced effects in microlensing events with rotating source star
• Characterization of Stellar Spots in Next-Generation Microlensing Surveys
• Timing analysis in microlensing
• Determination of Stellar Ellipticities in Future Microlensing Surveys