2731383

Target RA (J2000): 154.90837097168 and deg Target Dec (J2000): -9.8062801361084 and deg Gaia GMag: 11.907 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）：154.90837097168 度
目标赤纬（J2000坐标系）：-9.8062801361084 度
盖亚（Gaia）G星等：11.907
项目编号：CH_PR140063
项目主管：巴罗斯（BARROS）
观测项目首席研究员：本茨（Benz）
项目名称：“轴3——测量塑造行星系统的潮汐作用（TIDES）”

摘要：超短轨道周期行星会经受极强潮汐作用，导致行星形状发生畸变（Correia 2014、Barros等 2022）并引发轨道收缩。对行星潮汐畸变的测量，可用于估算其二阶流体洛夫数，进而深入探析行星内部结构。此外，通过测量潮汐衰减时标，我们能够估算恒星潮汐品质因子，这是约束恒星物理的关键参数。因此，对超短轨道周期行星的潮汐效应开展研究，可获取诸多关于塑造行星系统的行星与恒星间潮汐相互作用的关键信息。
我们还计划对数颗热木星开展潮汐衰减估算，预计在未来3年内可观测到其轨道周期的可测量缩减。CHEOPS拓展任务带来的更长观测基线，将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，我们在直接探测系外行星潮汐畸变方面取得了突破性进展。基于上述成果，我们计划通过凌星畸变特征（参考Barros等 2022）以及相位曲线特征（参考Akinsanmi等 待发表），进一步精准约束WASP-103b和WASP-12b的潮汐畸变程度。

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