期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 723, 期 1, 页码 L64-L67出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/723/1/L64
关键词
planet-star interactions; stars: coronae; stars: magnetic field
资金
- SHINE through NSF [ATM-0823592]
- NASA-LWSTRT [NNG05GM44G]
- NASA [NAS8-39073]
- NASA ESS
- NASA ESTO-CT
- NSF KDI
- DoD MURI
We present a numerical magnetohydrodynamic 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 approximate to 1.5-2, while the angular momentum loss rate drops by a factor of approximate to 4 as the distance decreases past the Alfven surface. This reduction in angular momentum loss is due to the interaction between the stellar and planetary Alfven surfaces, which modifies the global structure of the stellar corona and stellar wind on the hemisphere facing the planet, as well as on 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 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.
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