2741899

Target RA (J2000): 189.839218139648 and deg Target Dec (J2000): 20.0273399353027 and deg Gaia GMag: 8.172 Programme ID: CH_PR140080 Programme Manager: LELEU PI of observing programme: Benz Title of programme: Axis 1 - Architecture of Resonant Chains (ARC) Abstract: Resonant chains are gold mines for fueling our understanding of planetary systems. The minute details of their architectures encode the history of their formation: the order of the capture of the planets in the chain (Delisle 2017) the local shape of the proto-planetary disc and its dispersal (e.g. Nesvorny et al 2022) and the long-term evolution of the system through tidal dissipation (e.g. Papaloizou et al 2018). The high multiplicity of these systems also makes them especially valuable to constrain our models of the formation of planetary systems (See Emsenhuber et al 2022 and other papers of the NGPPS series) since all the planets have to form in the same environment and the relative fragility of the configuration ensures that no violent evolution (e.g. close encounters/impacts) occurred after the dissipation of the proto-planetary disc (Leleu et al 2021). In addition the transit timing variations induced by the compactness of the systems allow for precise mass determination down to a few per cent in the case of Trappist-1 (Agol et al 2021). This allows an in-depth characterization of moderately insolated rocky planets and mini-Neptune with a precision which is rarely reachable through radial velocities enabling studies of their interiors and atmospheres. The brightness of the current targets of the program (Gaia band mag 11 for TOI178 12 for K2-138 8.4 for TOI1835) allows to combine RVs and photometric measurements. The two methods have a great synergy as TTVs allow for in-depth characte [truncated! Please see actual data for full text]

目标赤经（J2000坐标系）：189.839218139648 度，目标赤纬（J2000坐标系）：20.0273399353027 度，盖亚（Gaia）G星等：8.172，项目编号：CH_PR140080，项目主管：LELEU，观测项目首席研究员：Benz，项目名称：轴1——共振链架构（ARC）

摘要：共振链是助力我们深化对行星系统认知的宝贵宝库。其结构的细微细节编码了行星系统的形成历史：行星在共振链中的捕获顺序（Delisle 2017）、原行星盘的局部形态及其消散过程（例如Nesvorny等人2022），以及系统通过潮汐耗散产生的长期演化（例如Papaloizou等人2018）。这类多行星系统的高多重特性，也格外有助于我们约束行星系统形成模型（详见Emsenhuber等人2022及NGPPS系列的其他论文）——因为所有行星均形成于同一环境中，且该构型的相对脆弱性确保了原行星盘消散后未发生剧烈演化（例如近距离交会或撞击事件，Leleu等人2021）。此外，这类系统的紧凑结构所引发的凌星时间变化（Transit Timing Variations，TTVs）可实现高精度的质量测定，在Trappist-1系统中精度可达百分之几（Agol等人2021）。这使得我们能够通过径向速度（Radial Velocity，RV）法难以企及的高精度，对中等辐照强度的岩质行星和迷你海王星进行深度表征，进而开展其内部结构与大气的相关研究。本项目当前目标天体的亮度（盖亚星等：TOI178为11等、K2-138为12等、TOI1835为8.4等）可结合径向速度与测光测量数据开展研究。这两种方法具有极佳的协同效应，凌星时间变化（TTVs）可实现深度特征表征——[文本已截断！请查阅实际数据以获取完整内容]