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Target RA (J2000): 216.924026489258 and deg Target Dec (J2000): 41.9534187316895 and deg Gaia GMag: 9.659 Programme ID: CH_PR159006 Programme Manager: ZULETA PI of observing programme: Benz Title of programme: SoM - TRACE Abstract: The TRACE (Measuring the TRansit light sourCe Effect with CHEOPS) program aims to use the CHEOPS telescope to characterize the transit light source effect (TLSE) for exoplanet targets scheduled for observation with the JWST. This effort addresses a critical challenge in exoplanet atmosphere analysis: contamination from stellar activity such as star spots and faculae which can skew measurements of planetary atmospheres by introducing variability in observed spectra. The program will conduct high-precision photometric observations in the optical band an essential range that JWST does not cover but is critical to identify and mitigate stellar contamination in transmission spectra. Focusing on two primary targets in a first stage --TOI-1416 and GJ9827--the project plans long-baseline in and out-of-transit observations spread across a few stellar rotations to model activity-related flux variations. These findings are expected to help the JWST data interpretation of the planets atmosphere and support the broader scientific community by making data publicly available immediately. By characterizing activity in CHEOPS-observed systems TRACE aims to enhance our understanding of exoplanet atmospheres and prepare for future synergy with upcoming missions such as PANDORA. [truncated! Please see actual data for full text]

目标赤经（Right Ascension, RA）（J2000坐标系）：216.924026489258 度
目标赤纬（Declination, Dec）（J2000坐标系）：41.9534187316895 度
盖亚G星等：9.659
项目编号：CH_PR159006
项目主管：祖莱塔（ZULETA）
观测项目首席研究员：本茨（Benz）
项目名称：SoM-TRACE
摘要：TRACE项目（全称：利用CHEOPS望远镜测量凌星光源效应）旨在借助CHEOPS望远镜，对计划由詹姆斯·韦布空间望远镜（JWST）开展观测的系外行星目标天体，完成凌星光源效应（Transit Light Source Effect, TLSE）的特征刻画。该项目旨在解决系外行星大气分析中的一项关键难题：恒星活动（如黑子与光斑）引发的污染会通过引入观测光谱的变化，干扰行星大气的测量结果。本项目将在光学波段开展高精度测光观测——该波段是JWST未覆盖的关键区间，对识别并校正凌星光谱中的恒星污染至关重要。项目第一阶段将聚焦两颗核心目标天体——TOI-1416与GJ9827，计划开展跨越多颗恒星自转周期的长基线凌星与凌星外观测，以构建活动相关的流量变化模型。预期该项目的研究成果将助力JWST对行星大气的数据分析，并通过第一时间公开观测数据，为全球天文学界提供支持。通过对CHEOPS观测系统中的恒星活动进行特征刻画，TRACE项目旨在加深我们对系外行星大气的认知，并为未来与PANDORA等后续任务的协同观测做好准备。
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