Polar planets: birthplace in misaligned circumbinary discs and dynamics (Prof. Cristian Giuppone; Universidad Nacional de Córdoba)

Desde Marzo 07, 2019 13:15 hasta Marzo 07, 2019 13:45

En Instituto de Astrofísica, Pontificia Universidad Católica, Vicuña Mackenna 4860, Santiago, Chile

Categorías: Seminarios

Dynamical studies suggest that most of the circumbinary discs should be coplanar, i.e. the rotation vectors of the binary and the disc are aligned. However, some recent theoretical works show that under certain conditions a circumbinary disc can become polar, which means that its rotation vector is orthogonal with respect to the binary.

We study the evolution of misaligned circumbinary discs and the dynamical evolution of their potential polar planets. Furthermore, we produce dynamical maps for different binary parameters and identify the combination of parameters that lead to disc polar alignment. Finally, we numerically test recent theoretical predictions based on linear theory.

We found out that polar and retrograde circumbinary discs are an expected outcome around misaligned binary systems. In such systems, the resulting planetary architectures could be polar and retrograde as well. We show that polar planet configurations are stable over a wide range of binary parameters. Therefore, despite their low probability of detection, we suggest that polar (P-type) planets might be more common than previously thought.