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Target RA (J2000): 274.405456542969 and deg Target Dec (J2000): 36.6214408874512 and deg Gaia GMag: 11.816 Programme ID: CH_PR149004 Programme Manager: WILSON PI of observing programme: Benz Title of programme: SoM - Pre-PLATO TTVIGIL (Transit Timing Variation observations to fill In Gaps In Long-baseline data) Abstract: Important current questions of exoplanet science require an underlying precise determination of planet internal structures that can be done by studying their mass and/or orbital evolution. Transit timing variations (TTVs) can bypass stellar activity issues that can hinder RVs observations to achieve accurate mass determination and transit timing monitoring may reveal tidal decay that can inform the orbital evolution history of planets. The accuracy of these methods is mainly driven by 1) the knowledge of individual transit centre times and 2) the number of transits obtained and their baseline and sampling. PLATO will launch at the end of 2026 and focus on the detection of new exoplanets around bright stars. A supplementary scientific outcome will be the continuous observation of known exoplanets that will provide TTV/tidal decay monitoring. However to constrain planetary masses and orbit evolution we need to fill in gaps in the long-baseline data between the discovery transits and those that PLATO will observe. To do this we will observe transits of known exoplanets in the PLATO long- stare fields that are visible by CHEOPS. [truncated! Please see actual data for full text]

目标赤经（J2000）：274.405456542969 度
目标赤纬（J2000）：36.6214408874512 度
盖亚G星等（Gaia GMag）：11.816
项目编号：CH_PR149004
项目主管：WILSON
观测项目首席研究员（Principal Investigator，PI）：Benz
项目名称：SoM——PLATO前期TTVIGIL（填补长基线数据空白的凌星时间变化观测，全称Transit Timing Variation observations to fill In Gaps In Long-baseline data）

摘要：当前系外行星科学领域的诸多核心问题，需通过研究行星质量与轨道演化，实现对其内部结构的精准测定方能解答。凌星时间变化（Transit Timing Variations，TTVs）可规避恒星活动对视向速度（Radial Velocity，RVs）观测精准测定行星质量的干扰；同时，凌星时间监测能够揭示潮汐衰减现象，为行星轨道演化历史提供关键参考依据。上述方法的精度主要由两项核心因素决定：1）单颗凌星中心时刻的测定精度；2）已获取的凌星事件总数、观测基线与采样方案。
PLATO望远镜预计于2026年底发射，其核心任务为探测亮星周围的系外行星；附加科学目标还包括对已知系外行星开展持续观测，以实现凌星时间变化与潮汐衰减的监测。然而，若要约束行星质量与轨道演化参数，我们亟需填补系外行星首次凌星发现至PLATO开展观测之间的长基线数据空白。为此，我们将对CHEOPS望远镜可观测范围内、处于PLATO长期凝视天区中的已知系外行星开展凌星观测。

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