JUPITER’S PHASE VARIATIONS FROM CASSINI: A TESTBED FOR FUTURE DIRECT-IMAGING MISSIONS
JUPITER’S PHASE VARIATIONS FROM CASSINI: A TESTBED FOR FUTURE DIRECT-IMAGING MISSIONS
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来自卡西尼号的木星相位变化：未来直接成像任务的试验台
DOI：
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发表时间：
2016
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通讯作者：
M. Marley
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作者：
L. Mayorga;J. Jackiewicz;K. Rages;Robert A. West;Ben Knowles;Nikole K. Lewis;Nikole K. Lewis;M. Marley
我们展示了2000年末到2001年初，卡西尼号/成像科学子系统（ISS）在多个光学带通中测量到的木星从~ 0°到140°的经验相位曲线。相位曲线对于研究木星的能量平衡和理解木星作为系外行星的散射行为具有重要意义。我们发现木星在部分相位比理想的朗伯系行星暗了大约25%，并且不能很好地适应类木星系外行星大气模型在所有波长。我们在几个卡西尼/ISS成像滤波器带通中提供了木星相位函数的分析拟合。此外，这些观测表明，木星的颜色随相位角的变化比模型预测的要大。因此，即使是在部分相位观测到的近双木星行星的颜色，也不能假定与木星在完全相位时的颜色相比较。我们讨论了宽视场红外巡天望远镜和其他未来的直接成像任务如何加强对冷巨星的研究。
We present empirical phase curves of Jupiter from ∼0° to 140° as measured in multiple optical bandpasses by Cassini/Imaging Science Subsystem (ISS) during the Millennium flyby of Jupiter in late 2000 to early 2001. Phase curves are of interest for studying the energy balance of Jupiter and understanding the scattering behavior of the planet as an exoplanet analog. We find that Jupiter is significantly darker at partial phases than an idealized Lambertian planet by roughly 25% and is not well fit by Jupiter-like exoplanet atmospheric models across all wavelengths. We provide analytic fits to Jupiter’s phase function in several Cassini/ISS imaging filter bandpasses. In addition, these observations show that Jupiter’s color is more variable with phase angle than predicted by models. Therefore, the color of even a near Jupiter-twin planet observed at a partial phase cannot be assumed to be comparable to that of Jupiter at full phase. We discuss how the Wide-Field Infrared Survey Telescope and other future direct-imaging missions can enhance the study of cool giants.