论文标题
HR 8799行星的大气监测和精确光谱与Scexao/Charis
Atmospheric Monitoring and Precise Spectroscopy of the HR 8799 Planets with SCExAO/CHARIS
论文作者
论文摘要
由于天气和斑点云，气体巨型行星的气氛被认为是不均匀的。我们使用Charis Integrales磁场在Subaru望远镜上的Scexao自适应光学系统背后的Charis Integrallable光谱仪对HR 8799行星进行了两个整夜的冠状观测，以搜索分光光度计量的变异性。我们没有检测到明显的可变性信号，而是将HR 8799 C和D的最低变异性上限放置。根据注射回收测试，我们预计将有50％的机会检测到HR 8799 C的H-频段光度变异性，而HR 8799 d的HR频率变异性降低到30％的H波段变异性。我们还研究了光谱变异性，并预计HR 8799 c的H/K通量比率有50％的恢复50％的变异性。我们合并了两个晚上的所有数据，以获得HR 8799 C，D和E获得的一些最精确的光谱。使用多云的辐射感染 - 热化学平衡模型，我们发现所有三个行星都偏爱超级金属性，有效温度为〜1100 k。但是，我们的高信噪光谱表明，HR 8799 D表明，HR 8799 c的光谱与HR 8799 c，可能是更垂直的范围，并且指出了众所周知的范围。
The atmospheres of gas giant planets are thought to be inhomogeneous due to weather and patchy clouds. We present two full nights of coronagraphic observations of the HR 8799 planets using the CHARIS integral field spectrograph behind the SCExAO adaptive optics system on the Subaru Telescope to search for spectrophomometric variability. We did not detect significant variability signals, but placed the lowest variability upper limits for HR 8799 c and d. Based on injection-recovery tests, we expected to have a 50% chance to detect signals down to 10% H-band photometric variability for HR 8799 c and down to 30% H-band variability for HR 8799 d. We also investigated spectral variability and expected a 50% chance to recovery 20% variability in the H/K flux ratio for HR 8799 c. We combined all the data from the two nights to obtain some of the most precise spectra obtained for HR 8799 c, d, and e. Using a grid of cloudy radiative-convective-thermochemical equilibrium models, we found all three planets prefer supersolar metallicity with effective temperatures of ~1100 K. However, our high signal-to-noise spectra show that HR 8799 d has a distinct spectrum from HR 8799 c, possibly preferring more vertically extended and uniform clouds and indicating that the planets are not identical.
