行星母星HD 189733的自转周期
The Rotation Period of the Planet-Hosting Star HD 189733
摘要：
我们目前的天气光学测光HD 189733，色球活跃的母星的一个最深入研究的系外行星。我们已经大大延长了我们以前报告的观测时间跨度，并将恒星自转周期的估计精确了一个数量级以上：$P = 11.953\pm 0.009$天。我们推导出一个下限的恒星旋转轴的$56\arcdeg$（95%的置信度），证实了早期的证据表明，恒星旋转轴和行星轨道轴是很好的对齐。
英文摘要：
We present synoptic optical photometry of HD 189733, the chromospherically active parent star of one of the most intensively studied exoplanets. We have significantly extended the timespan of our previously reported observations and refined the estimate of the stellar rotation period by more than an order of magnitude: $P = 11.953\pm 0.009$ days. We derive a lower limit on the inclination of the stellar rotation axis of $56\arcdeg$ (with 95% confidence), corroborating earlier evidence that the stellar spin axis and planetary orbital axis are well aligned.
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