Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-09-29
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
6 pages, 3 figures
Scientific paper
We present a numerical Magnetohydrodynamic (MHD) study of the dependence of stellar mass and angular momentum- loss rates on the orbital distance to close-in giant planets. We find that the mass loss rate drops by a factor of $\approx$1.5-2, while the angular momentum loss rate drops by a factor of $\approx$4 as the distance decreases past the Alfv\'en surface. This reduction in angular momentum loss is due to the interaction between the stellar and planetary Alfv\'en surfaces, which modifies the global structure of the stellar corona and stellar wind on the hemisphere facing the planet, as well as the opposite hemisphere. The simulation also shows that the magnitude of change in angular momentum loss rate depends mostly on the strength of the planetary magnetic field and not on its polarity. The interaction however, begins at greater separation if the overall field topology of the star and the planet are of anti-aligned. Our results are consistent with evidence for excess angular momentum in stars harboring close-in giant planets, and show that the reduction in wind-driven angular momentum loss can compete with, and perhaps dominate, spin-up due to tidal interaction.
Cohen Ofer
Drake Jeremy J.
Gombosi Tamas I.
Kashyap Vinay L.
Sokolov Igor V.
No associations
LandOfFree
The Impact of Hot Jupiters on the Spin-down of their Host Stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Impact of Hot Jupiters on the Spin-down of their Host Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Impact of Hot Jupiters on the Spin-down of their Host Stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-525034