由近红外地球反射观测探测的海洋的偏振特征
Polarimetric signature of the oceans as detected by near-infrared Earthshine observations
摘要：
上下文发现一颗有海洋的太阳系外行星对寻找地球以外的生命至关重要。从理论上可以预期从光滑液体表面镜面反射光的偏振检测，尽管地球海洋的偏振特征尚未在圆盘集成行星光中最终检测到。目标。我们的目标是探测和测量地球海洋的偏振特征。方法.我们进行了近红外偏振测量月球地球的光芒，并收集了32个晚上的数据与各种海洋部分在地球的光芒贡献区域。结果极化度与海洋分数之间存在明显的正相关关系。我们发现每小时的变化，根据旋转过渡的海洋部分的偏振。变化与典型偏振度的比值高达~0.2-1.4。结论.我们的观测为地球海洋的偏振特征提供了可信的证据。近红外线偏振测量法可被认为是寻找行星外海洋的一种有前景的技术。
英文摘要：
Context. The discovery of an extrasolar planet with an ocean has crucial importance in the search for life beyond Earth. The polarimetric detection of specularly reflected light from a smooth liquid surface is anticipated theoretically, though the polarimetric signature of Earth's oceans has not yet been conclusively detected in disk-integrated planetary light. Aims. We aim to detect and measure the polarimetric signature of the Earth's oceans. Methods. We conducted near-infrared polarimetry for lunar Earthshine and collected data on 32 nights with a variety of ocean fractions in the Earthshine-contributing region. Results. A clear positive correlation was revealed between the polarization degree and ocean fraction. We found hourly variations in polarization in accordance with rotational transition of the ocean fraction. The ratios of the variation to the typical polarization degree were as large as ~0.2-1.4. Conclusions. Our observations provide plausible evidence of the polarimetric signature attributed to Earth's oceans. Near-infrared polarimetry may be considered a prospective technique in the search for exoplanetary oceans.
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