2543348

Target RA (J2000): 24.354305 and deg Target Dec (J2000): -45.67788 and deg Gaia GMag: 9.166 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 planets shape (Correia 2014 Barros et al. 2022) and shrinkage of the planets orbit. Measuring the tidal deformation of the planet allows us to estimate the second-degree fluid Love number and gain insight into the planets 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坐标系）：24.354305 度
目标赤纬（J2000坐标系）：-45.67788 度
盖亚G星等（Gaia GMag）：9.166
项目编号：CH_PR140063
项目主管：BARROS
观测项目首席研究员：Benz
项目标题：Axis 3 - 测量塑造行星系统的潮汐（TIDES）
摘要：超短轨道周期行星受强烈潮汐力作用，导致行星形状变形（Correia 2014；Barros等 2022）及轨道收缩。测量行星的潮汐变形可估算其二阶流体洛夫数（Love number），并深入了解行星内部结构。此外，测量潮汐衰减时标可估算恒星潮汐品质因子，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-Jupiter）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任务扩展所允许的更长基线，对我们测量部分系统的潮汐衰减能力至关重要。在CHEOPS常规任务期间，我们在系外行星潮汐变形的直接探测方面取得了突破。基于这些成果，我们还提议通过凌星变形信号（类似Barros等 2022）及相位曲线中的信号（类似Akinsanmi等 待发表），进一步约束WASP-103b和WASP-12b的潮汐变形。
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