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Target RA (J2000): 351.770172119141 and deg Target Dec (J2000): -1.28627002239227 and deg Gaia GMag: 9.841 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（J2000坐标系）：351.770172119141 度，目标赤纬（J2000坐标系）：-1.28627002239227 度，盖亚G星等（Gaia GMag）：9.841，项目编号：CH_PR159006，项目主管：ZULETA，观测项目首席研究员：Benz，项目名称：SoM - TRACE
摘要：TRACE计划（全称：借助CHEOPS测量凌星光源效应，Measuring the TRansit light sourCe Effect with CHEOPS）旨在利用系外行星特征卫星（CHEOPS），为计划交由詹姆斯·韦布空间望远镜（James Webb Space Telescope，JWST）观测的系外行星目标表征凌星光源效应（Transit Light Source Effect，TLSE）。本计划旨在解决系外行星大气分析中的一项关键难题：恒星活动（如星斑与光斑）引发的污染——这类活动会通过引入观测光谱的变化，扭曲行星大气的测量结果。本计划将在光学波段开展高精度测光观测，该波段是詹姆斯·韦布空间望远镜未覆盖，但对识别并修正透射光谱中的恒星污染至关重要的核心区间。项目第一阶段将聚焦两个核心目标——TOI-1416与GJ9827，计划开展跨数个恒星自转周期的长基线凌星与非凌星观测，以建模恒星活动引发的光度变化。预期本研究成果将助力詹姆斯·韦布空间望远镜开展行星大气的数据解译，并通过第一时间公开数据服务于全球更广泛的科研社区。通过表征经CHEOPS观测的恒星系统的活动特征，TRACE计划旨在加深我们对系外行星大气的理解，并为未来与PANDORA等即将执行的任务开展协同合作做好准备。
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