Iranian Journal of Physics Research

Perturbation effect of stellar spots on light curves of gravitational microlensing

Document Type : Original Article

Authors

S Sajadian
M Rashidi

‎ Department of Physics, Isfahan University of Technology, Isfahan, Iran

https://doi.org/10.47176/ijpr.21.2.91118
Abstract
One of the advantages of observations of gravitational microlensing is stellar spots detection.  Our aim ‎in this paper is to study and characterize the perturbations due to stellar spots on the microlensing ‎light curves. Considering a suitable formalism for the stellar spots, we simulate the microlensing of ‎spotted source stars. One of the effects of a spot on stellar light curve is the local demagnification (where ‎the lens is crossing the stellar spot) and it causes asymmetric perturbations on the light curve. The ‎spots that locate at the source center after projection make larger and deeper perturbations than the ‎spots locate the stellar limbs. In caustic crossing binary microlensing events, the typical-size spot-‎induced perturbations mostly make (more than 40‏‎ percent) the relative deviations larger than ‎‏5‏‎. This ‎fraction is bigger for single lensing events‎‎‎.‎

Keywords

gravitational microlensing
stellar spots
numerical approach
  1. S Gaudi, ARAA 50 (2012) 411. 

  2. P Sangtarash, Master of Science Thesis, IUT (2019).

  3. S Sajadian and S Rahvar, MNRAS 452 (2015) 2579.

  4. W Bradly.Carroll and A Dale.Ostile, “An introduction to Modern Astrophysics”, ,  Person Addison-Wesley, Second edition (2007).

  5. S Dodelson “MODERN COSMOLOGY”, Elsevier (2003).

  6. Ch Han, et al., MNRAS 316 (2000) 665.


 


 



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