2161817

Target RA (J2000): 314.268463 and deg Target Dec (J2000): 31.66097 and deg Gaia GMag: 11.796 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（Right Ascension, J2000历元）：314.268463 度
目标赤纬（Declination, J2000历元）：31.66097 度
盖亚（Gaia）G星等：11.796
项目编号：CH_PR140063
项目主管：BARROS
观测项目首席研究员（Principal Investigator, PI）：Benz
项目名称：轴3——塑造行星系统的潮汐测量（TIDES）
摘要：超短轨道周期行星会受到极强的潮汐力作用，导致行星形状发生形变（Correia 2014；Barros等人2022）并使其轨道收缩。对行星潮汐形变的测量，可帮助我们估算二阶流体洛夫数（Love number），并深入解析行星的内部结构。此外，通过测量潮汐衰减时标，我们还能估算恒星潮汐品质因数，这一参数对约束恒星物理研究至关重要。因此，针对超短轨道周期行星的潮汐效应展开研究，可为我们揭示塑造行星系统的行星-恒星潮汐相互作用提供丰富的信息。本项目还计划对若干热木星（hot-Jupiters）的潮汐衰减进行估算，我们预计在未来3年内可观测到其轨道周期的显著变化。系外行星特征探测卫星（CHEOPS）任务延期所提供的更长观测基线，对我们测量部分系统的潮汐衰减至关重要。在CHEOPS常规任务执行期间，我们在系外行星潮汐形变的直接探测方面取得了突破性进展。基于上述成果，我们计划通过凌星（transit）形变特征（参考Barros等人2022年研究）以及相位曲线（phase curve）特征（参考Akinsanmi等人待发表研究），进一步精确约束WASP-103b和WASP-12b的潮汐形变。
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