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arXiv 1004.4252astro-ph.EPastro-ph.SR
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恒星活动与热彗星表面重力的相关性

A Correlation Between Stellar Activity and the Surface Gravity of Hot Jupiters

Joel D. Hartman

摘要:

最近,Knutson等人(2010)已经证明了热彗星大气中温度反转的存在与宿主恒星的色球活动水平之间的相关性。在这里,我们表明,也有一个相关性,大于99.5%的置信度,热彗星的表面重力和宿主恒星的活动水平之间,这样,高表面重力行星往往被发现周围的高活动恒星。我们还发现行星质量和色球活动之间的正相关性不太显著,但行星半径和色球活动之间没有显着的相关性。我们认为这可能是由于观测偏差对检测低质量行星周围的高活动恒星的可能性,但得出的结论是,这种偏见只可能影响检测的行星比这里考虑的要小得多。最后,我们推测的相关性的物理起源,包括恒星日照对行星半径的影响被大大低估的可能性,强紫外线通量蒸发行星大气,或高质量的热彗星诱导活动在其宿主恒星,但没有发现任何这些假设是特别引人注目的。

英文摘要:

Recently Knutson et al. (2010) have demonstrated a correlation between the presence of temperature inversions in the atmospheres of hot Jupiters, and the chromospheric activity levels of the host stars. Here we show that there is also a correlation, with greater than 99.5% confidence, between the surface gravity of hot Jupiters and the activity levels of the host stars, such that high surface gravity planets tend be found around high activity stars. We also find a less significant positive correlation between planet mass and chromospheric activity, but no significant correlation is seen between planet radius and chromospheric activity. We consider the possibility that this may be due to an observational bias against detecting lower mass planets around higher activity stars, but conclude that this bias is only likely to affect the detection of planets much smaller than those considered here. Finally, we speculate on physical origins for the correlation, including the possibility that the effect of stellar insolation on planetary radii has been significantly underestimated, that strong UV flux evaporates planetary atmospheres, or that high mass hot Jupiters induce activity in their host stars, but do not find any of these hypotheses to be particularly compelling.

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