Polar circumtriple planets and disks can only form close to a triple star
arXiv:2301.01284 · doi:10.3847/2041-8213/acaf6d
Abstract
Observations of protoplanetary disks around binary and triple star systems suggest that misalignments between the orbital plane of the stars and the disks are common. Motivated by recent observations of polar circumbinary disks, we explore the possibility for polar circumtriple disks and therefore polar circumtriple planets that could form in such a disk. With n-body simulations and analytic methods we find that the inclusion of the third star, and the associated apsidal precession, significantly reduces the radial range of polar orbits so that circumtriple polar disks and planets can only be found close to the stellar system. Outside of a critical radius, that is typically in the range of 3-10 times the outer binary separation depending upon the binary parameters, the orbits behave the same as they do around a circular orbit binary. For some observed systems that have shorter period inner binaries, the critical radius is considerably larger. If polar circumtriple planets can form, we suggest that it is likely that they form in a disk that was subject to breaking.
Accepted for publication in ApJL
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Cited by in corpus (4)
- Precession and polar alignment of accretion discs in triple (or multiple) stellar systems
- Coplanar circumbinary planets can be unstable to large tilt oscillations in the presence of an inner polar planet
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