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Target RA (J2000): 348.949036 and deg Target Dec (J2000): -10.84969 and deg Gaia GMag: 12 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 characterization of [truncated! Please see actual data for full text]

目标赤经（J2000坐标系）：348.949036 度；目标赤纬（J2000坐标系）：-10.84969 度；盖亚（Gaia）G星等：12；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——共振链结构（ARC）

共振链是推动我们理解行星系统的宝贵宝库。其结构的精细细节镌刻着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（如Nesvorny等，2022），以及系统通过潮汐耗散发生的长期演化（如Papaloizou等，2018）。这类系统的高多重性特征，使其成为约束行星系统形成模型的关键样本（详见Emsenhuber等，2022及NGPPS系列的其他研究），这是因为所有行星均形成于同一原行星环境，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（如近距离交会或撞击，Leleu等，2021）。此外，系统紧凑性引发的凌星时间变化（Transit Timing Variations, TTV）可实现高精度质量测定，以TRAPPIST-1为例，其质量测定精度可达百分之几量级（Agol等，2021）。这使得我们能够以径向速度（radial velocity, RV）法难以企及的精度，对受辐照适中的岩质行星与迷你海王星开展深入表征，进而研究其内部结构与大气特征。本项目当前目标天体的亮度（TOI-178的盖亚G星等为11，K2-138为12，TOI-1835为8.4）支持径向速度与测光测量的联合观测。两种观测方法具备极佳的协同效应，凌星时间变化可实现对[文本已截断！请查阅实际数据以获取完整内容]