Radio Emissions from Substellar Companions of Evolved Cool Stars

Details Radio Emissions from Substellar Companions of Evolved Cool Stars Radio Emissions from Substellar Companions of Evolved Cool Stars

2009-11-09

arxiv.org/abs/0911.1738v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

Scientific paper

A number of substellar companions to evolved cool stars have now been reported. Cool giants are distinct from their progenitor Main Sequence (MS) low-mass stars in a number of ways. First, the mass loss rates of cool giant stars are orders of magnitude greater than for the late-type MS stars. Second, on the cool side of the Linsky-Haisch "dividing line", K and M giant stars are not X-ray sources, although they do show evidence for chromospheres. As a result, cool star winds are largely neutral for those spectral types, suggesting that planetary or brown dwarf magnetospheres will not be effective in standing off the stellar wind. In this case one expects the formation of a bow shock morphology at the companion, deep inside its magnetosphere. We explore radio emissions from substellar companions to giant stars with ionised winds or neutral winds.

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