2559523

Target RA (J2000): 26.632746 and deg Target Dec (J2000): 2.70057 and deg Gaia GMag: 9.395 Programme ID: CH_PR140078 Programme Manager: DEMANGEON PI of observing programme: Benz Title of programme: Axis 2 - Beyond Geometrical Albedo: A deeper understanding of the reflective behavior of exoplanet atmospheres (BENGAL) Abstract: Our knowledge of the reflective properties of exoplanet atmospheres is extremely limited outside of the Solar System planets. The geometric and Bond albedo measurements constitute the majority of the subjects observational constraints. Reflected light phase curves hold the key to gaining a better understanding of the fundamental scattering properties: single scattering albedo and asymmetry as well as determining the degree of inhomogeneity in the spatial distribution of clouds hazes and aerosols. However due to observational biases the vast majority of existing datasets that show a clear phase curve signal in the visible are aimed at hot gas giants. As a result they are plagued by the degeneracy between reflected and thermal light. Only Kepler-7 b was cool enough and Kepler sensitive enough to deliver a high precision phase curve that is dominated by reflected light. Kepler-7 b is thus the only exoplanet for which we have direct measurements of cloud distribution inhomogeneity and fundamental scattering properties. With this program we will leverage CHEOPS’ photometric precision bandpass and pointing flexibility to perform repeated phase curves observations of a few key targets. These canonical datasets will provide precise reflected light phase curves and will offer long-awaited counterparts to Kepler-7 b. We will investigate atmospheric inhomogeneity and measure fundamental scattering properties. We will begin to explore the d [truncated! Please see actual data for full text]

目标赤经（J2000历元）：26.632746 度
目标赤纬（J2000历元）：2.70057 度
盖亚G星等（Gaia GMag）：9.395
项目ID：CH_PR140078
项目主管：DEMANGEON
观测项目首席研究员（Principal Investigator，PI）：Benz
项目标题：第二轴线——超越几何反照率：深入理解系外行星大气的反射行为（BENGAL）
摘要：对于太阳系外行星大气反射特性的认知，我们仍极为有限。几何反照率与邦德反照率的测量构成了该领域观测约束的主要部分。反射光相位曲线是深入理解基本散射特性（包括单次散射反照率与不对称性）以及确定云层、霾和气溶胶空间分布不均匀程度的关键。然而，由于观测偏差，现有在可见光波段呈现清晰相位曲线信号的数据集，绝大多数针对的是热气态巨行星，因此受限于反射光与热辐射之间的简并性。唯有开普勒-7b足够凉爽，且开普勒望远镜的灵敏度足以获取以反射光为主的高精度相位曲线，因此它是唯一一颗我们能直接测量其云层分布不均匀性及基本散射特性的系外行星。通过本项目，我们将利用CHEOPS卫星的测光精度、波段覆盖及指向灵活性，对若干关键目标开展重复相位曲线观测。这些典型数据集将提供高精度的反射光相位曲线，并为开普勒-7b提供期待已久的对照样本。我们将研究大气不均匀性并测量基本散射特性。我们将开始探索d[原文截断！完整文本请参见实际数据]