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Target RA (J2000): 307.859772 and deg Target Dec (J2000): 39.93881 and deg Gaia GMag: 7.577 Programme ID: CH_PR140063 Programme Manager: BARROS PI of observing programme: Benz Title of programme: Axis 3 - Measuring tides that shape planetary systems (TIDES) Abstract: Ultra-short orbital period planets suffer from intense tidal forces which lead to a deformation of the planet's shape (Correia 2014 Barros et al. 2022) and shrinkage of the planet's orbit. Measuring the tidal deformation of the planet allows us to estimate the second-degree fluid Love number and gain insight into the planet's internal structure. Moreover measuring the tidal decay timescale allows us to estimate the stellar tidal quality factor which is key to constraining stellar physics. Therefore studying tidal effects in ultra-short orbital period planets gives us a wealth of information on planet-to-star tidal interactions that shape planetary systems. We also propose to estimate the tidal decay of a few hot-Jupiters for which we expect a measurable orbital period decrease within the next 3 years. The longer baseline allowed by the CHEOPS extension will be crucial for our ability to measure the tidal decay of some systems. During the CHEOPS nominal mission we achieved a breakthrough on the direct detection of the tidal deformation of exoplanets. Building on these results we also propose to better constrain the tidal deformation of WASP-103b and WASP-12b directly from the transit deformation signature (similar to Barros et al. 2022) and also from the signature in the phase curve (similar to Akinsanmi et al. in prep.). [truncated! Please see actual data for full text]

目标赤经（J2000）：307.859772度 目标赤纬（J2000）：39.93881度 盖亚G星等：7.577 项目ID：CH_PR140063 项目主管：BARROS 观测项目首席研究员：Benz 项目名称：Axis3 - 测量塑造行星系统的潮汐（TIDES） 摘要：超短轨道周期行星受到强烈的潮汐力作用，导致其形状发生形变（Correia 2014；Barros等2022）并使其轨道收缩。测量行星的潮汐形变有助于我们估算二阶流体洛夫数（second-degree fluid Love number），从而深入了解行星的内部结构。此外，测量潮汐衰减时标可估算恒星潮汐品质因数（stellar tidal quality factor），这是约束恒星物理的关键。因此，研究超短轨道周期行星的潮汐效应能为我们提供大量关于塑造行星系统的行星-恒星潮汐相互作用的信息。我们还计划估算几颗热木星（hot-Jupiters）的潮汐衰减，预计未来3年内这些行星的轨道周期会出现可测量的缩短。CHEOPS扩展任务提供的更长基线对我们测量某些系统的潮汐衰减能力至关重要。在CHEOPS常规任务期间，我们在直接探测系外行星潮汐形变方面取得了突破。基于这些结果，我们还计划通过凌星形变信号（类似Barros等2022）和光变曲线信号（类似Akinsanmi等，待发表）更好地约束WASP-103b和WASP-12b的潮汐形变。[截断！请查阅实际数据获取全文]