Using Deep Space Climate Observatory Measurements to Study the Earth as an Exoplanet
Using Deep Space Climate Observatory Measurements to Study the Earth as an Exoplanet
复制标题
DOI：
10.3847/1538-3881/aac6e2
复制
发表时间：
2018-07-01
影响因子：
5.3
通讯作者：
Yung, Yuk L.
中科院分区：
文献类型：
--
作者：
Jiang, Jonathan H.;Zhai, Albert J.;Yung, Yuk L.
尽管深空气候观测站（DSCOVR）并不是作为系外行星研究任务而设计的，但它已被机会性地用于一项以地球作为代理系外行星的新颖实验。使用超过 2 年的 DSCOVR 地球图像来生成多波长、单点光源的时间序列，以提取有关行星自转、云图案、表面类型和绕太阳轨道的信息。在下文中，我们假设地球的这些特性是未知的，并尝试从第一原理中推导出它们。然后将这些结论与有关我们星球的已知数据进行比较。我们还使用 DSCOVR 数据来模拟相位角变化，以及确定系外行星自转周期所需的最小数据收集速率。这种利用多波长反射单点光源的时间演化的创新方法可用于检索遥远恒星周围系外行星的一系列固有特性。
Even though it was not designed as an exoplanetary research mission, the Deep Space Climate Observatory (DSCOVR) has been opportunistically used for a novel experiment in which Earth serves as a proxy exoplanet. More than 2 yr of DSCOVR Earth images were employed to produce time series of multiwavelength, single-point light sources in order to extract information on planetary rotation, cloud patterns, surface type, and orbit around the Sun. In what follows, we assume that these properties of the Earth are unknown and instead attempt to derive them from first principles. These conclusions are then compared with known data about our planet. We also used the DSCOVR data to simulate phase-angle changes, as well as the minimum data collection rate needed to determine the rotation period of an exoplanet. This innovative method of using the time evolution of a multiwavelength, reflected single-point light source can be deployed for retrieving a range of intrinsic properties of an exoplanet around a distant star.