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A hot Jupiter for breakfast? --- Early stellar ingestion of planets may be common by Matsakos, Titos; Königl, Arieh is a scholarly article available to read on EtoBox.

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Models of planet formation and evolution predict that giant planets form efficiently in protoplanetary disks, that most of these migrate rapidly to the disk's inner edge, and that, if the arriving planet's mass is $\lesssim$ Jupiter's mass, it could remain stranded near that radius. We argue that such planets would be ingested by tidal interaction with the host star on a timescale $\lesssim1\,$Gyr, and that, in the case of a solar-type host, this would cause the stellar spin to approach the direction of the ingested planet's orbital axis even if the two were initially highly misaligned. Primordially misaligned stars whose effective temperatures are $\gtrsim6250\,$K cannot be realigned in this way because, in contrast with solar-type hosts, their angular momenta are typically higher than the orbital angular momentum of the ingested planet as a result of inefficient magnetic braking and of a comparatively large moment of inertia. Hot Jupiters located farther out from the star can contribute to this process, but their effect is weaker because the tidal interaction strength decreases rapidly with increasing semimajor axis. We demonstrate that, if $\sim50\%$ of planetary systems harbore

Author

Matsakos, Titos; Königl, Arieh

Published

2015

Language

EN