Microlensed Radio Emission from Exoplanets
Abstract
We investigate the detectability of radio emission from exoplanets, especially hot Jupiters, which are magnified by gravitational microlensing. We consider the scenario in which the planetary system with a hot Jupiter is the source of the lensing event and the planetary auroral emission dominates the light from the source system at the considered wavelength/frequency. In this system, because the source orbits the star with the period of O(1) days, much shorter than the typical timescale of magnification, the magnification curve has a characteristic wavy feature depending on the orbital parameters. This feature is useful to identify radio emission from exoplanets and, in addition to magnification, makes it easier to detect exoplanets directly. Moreover, using microlensing, we can in principle study the magnetic properties of exoplanets closer to the galactic centre where the occurrence rate of gravitational microlensing is high. Finally, we estimate the expected event rate assuming the LOFAR and the first phase of the Square Kilometre Array.
- Publication:
-
43rd COSPAR Scientific Assembly. Held 28 January - 4 February
- Pub Date:
- January 2021
- Bibcode:
- 2021cosp...43E.519S