Binary microlensing with plasma environment -- Star and planet

Abstract

Galactic microlensing has been widely used to study the star and planet. The stellar wind plays an important role in the formation, environment and habitability of the planet. In this work we study a binary microlensing system including the stellar wind, i.e. a star with plasma environment plus a planet. Plasma surrounding the main lens causes chromatic deflection of the light rays, in addition to the gravitational one. As a result, such a lensing system can generate complicated caustics which depends on the different lensing parameters. In this work we study the magnification curves for different traces of the background source and compare the transitions of the formation of ``hill and hole'' in the magnification curves. We find that the plasma will cause extra caustic, shrink the central caustics generated by the star and push the caustic by the planet outwards. Observations and modelling of binary microlensing curves with taking plasma effect into account can provide a potential method to study plasma environment of the stars. In case of a high plasma density of the stellar wind, the plasma lensing effects will be observable in the sub-mm band.

11 pages, MNRAS

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Cited by in corpus (8)

• Strong deflection limit analysis of black hole lensing in inhomogeneous plasma
• Shadows of rotating black holes in plasma environments with aberration effects
• Time delay induced by plasma in strong lens systems
• Perturbative and numerical approach to plasma strong lensing
• Deflection of light rays in a moving medium around a spherically symmetric gravitating object
• Deciphering signatures of Kerr-Sen black holes in presence of plasma from the Event Horizon Telescope data
• Light deflection in axially symmetric stationary spacetimes filled with a moving medium
• Investigating the interplay of the braneworld gravity and the plasma environment on the black hole shadow