About The Project
Our study investigates the analysis of stellar chromospheric activity enhancement of hosts stars due to close-by hot-jupiters or simply put chromospheric hotspots due to hot jupiters in elliptical orbits using the model by A.F. Lanza, developed in 2008
Project Title: Analysis of Stellar Chromospheric Activity Enhancement due to close-by Hot Jupiters in Elliptical Orbits
Abstract: Recent observations of enhanced chromospheric activity on the surface
of host stars with close-by giant planets suggest a possibility of a magnetic interaction between the planetary magnetic field with the coronal field. The activity peak leads or lags
the subplanetary point by a few degrees to extreme cases like the 170◦
lag of v And.
Our study investigates the analysis of stellar chromospheric activity enhancement of hosts stars due to close-by hot-jupiters or simply put chromospheric hotspots due to hot jupiters in elliptical orbits using the model by A.F. Lanza, developed back in 2008. We conducted a numerical analysis to study how the stellar activity peak with respect to the subplanetary point varies as a function of the radial star-planet distance for elliptical systems. The eccentricity of planetary orbit is introduced as a free parameter to the model while we also vary other parameters within the permissible limits to analyse their effect on the phase lag.
The magnitude of the phase lag decreased with the decrease in the star-planet distance as the planet moved closer to the star in the elliptical orbit scenario. Also, larger eccentricities caused a greater variation of the phase lag and so did a larger semi major axis. This extension is a more accurate version of Lanza(2008). We expect it to be a possible explanation to the observed on-off mechanism of chromospheric hotspots in some systems.
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