paper

Stellar magnetic activity and exoplanets

arXiv:1705.05561 · doi:10.1051/epjconf/201716005011

Abstract

It has been proposed that magnetic activity could be enhanced due to interactions between close-in massive planets and their host stars. In this article, I present a brief overview of the connection between stellar magnetic activity and exoplanets. Stellar activity can be probed in chromospheric lines, coronal emission, surface spot coverage, etc. Since these are manifestations of stellar magnetism, these measurements are often used as proxies for the magnetic field of stars. Here, instead of focusing on the magnetic proxies, I overview some recent results of magnetic field measurements using spectropolarimetric observations. Firstly, I discuss the general trends found between large-scale magnetism, stellar rotation, and coronal emission and show that magnetism seems to be correlated to the internal structure of the star. Secondly, I overview some works that show evidence that exoplanets could (or not) act as to enhance the activity of their host stars.

Based on the review talk presented at "Seismology of the Sun and the Distant Stars 2016", July 2016, Azores, Portugal. To appear in the Proceedings "Seismology of the Sun and the Distant Stars 2016" Eds. Mario J. P. F. G. Monteiro, Margarida S. Cunha, Joao Miguel T. Ferreira

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