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The orbital motion, absolute mass and high-altitude winds of exoplanet HD 209458b

beimu1009 添加于 2010-6-26 08:01 | 1358 次阅读 | 0 个评论

作者
Snellen IAG, de Kok RJ, de Mooij EJW, Albrecht S
摘要
For extrasolar planets discovered using the radial velocity method1, the spectral characterization of the host star leads to a mass estimate of the star and subsequently of the orbiting planet. If the orbital velocity of the planet could be determined, the masses of both star and planet could be calculated using Newton’s law of gravity, just as in the case of stellar double-line eclipsing binaries. Here we report high-dispersion ground-based spectroscopy of a transit of the extrasolar planet HD 209458b. We see a significant wavelength shift in absorption lines from carbon monoxide in the planet’s atmosphere, which we conclude arises from a change in the radial component of the planet’s orbital velocity. The masses of the star and planet are 1.00 ± 0.22MSun and 0.64 ± 0.09MJup respectively. A blueshift of the carbon monoxide signal of approximately 2 km s−1 with respect to the systemic velocity of the host star suggests the presence of a strong wind flowing from the irradiated dayside to the non-irradiated nightside of the planet within the 0.01–0.1 mbar atmospheric pressure range probed by these observations. The strength of the carbon monoxide signal suggests a carbon monoxide mixing ratio of (1–3) × 10−3 in this planet’s upper atmosphere.
详细资料
- 文献种类:期刊
- 期刊名称: Nature
- 期刊缩写: Nature
- 期卷页: 2010年第465卷第7301期 1049-1051页
- ISBN: 0028-0836
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遥远星球上的风速超过音速

时速200多公里的飓风卡特里娜在行星HD209458B看来简直是徐徐的清风。根据发表在《自然》杂志上的研究报告(全文)，这颗星球上的风速远远超过音速。

行星HD209458B位于飞马座150光年处，是一颗热木星，与木星大小相近，其轨道与母星十分接近。它与水星和月球一样，都是潮汐锁定，总是同一面对着它的母星。对着阳光的一面温度从未低于1000˚C，但背对光的一面温度只有几百度，巨大的温度梯度产生了难以想象的风速。研究人员通过分析行星飞行到恒星前面时大气层的光谱，发现它大气层主要由一氧化碳组成，其风速达到每小时7000公里——地球上的飞机没有一架能达到如此高的速度。

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