2314584

Target RA (J2000): 53.650860 and deg Target Dec (J2000): 20.59924 and deg Gaia GMag: 10.864 Programme ID: CH_PR140073 Programme Manager: LAM PI of observing programme: Benz Title of programme: Axis 1 - Gas Contents of Low Mass Planets (GCLMP) Abstract: The priority questions for planetary sciences are aimed at understanding the origin of planetary systems and life. Planet formation is a complex process that starts with the condensation of matter in a disc of molecular gas and dust. Planetesimals grow into planets accrete material lose volatiles chemically evolve and outgas contract as they cool down and finally are destroyed or survive when the star dies ejecting back material into the interstellar medium and possibly starting again a new cycle. Most of the evidence that we have on these processes comes from the study of our Solar System and astrophysical observations of neighboring stars. The detection and characterization of extrasolar planets revealed a diversity of planetary systems beyond the Solar System but these discoveries challenged existing planet formation theories. Precisely characterized bulk properties of exoplanets help place constraints on the varying formation conditions and evolution processes in order to understand the origin of exoplanets. In this program we propose the characterization of long-period (P > 15 days) low-mass gas-rich planets (defined as planets with radii between 2 and 4 Earth radii) by refining their planetary radii. [truncated! Please see actual data for full text]

目标赤经（J2000）：53.650860 度；目标赤纬（J2000）：20.59924 度；盖亚G星等：10.864；项目编号：CH_PR140073；项目主管：LAM；观测项目首席研究员：本茨；项目名称：轴1——低质量行星气体含量（GCLMP）
摘要：行星科学的核心议题围绕理解行星系统与生命的起源展开。行星形成是一个始于分子气体与尘埃盘内物质凝聚的复杂过程：星子逐步生长为行星，期间经历吸积物质、散失挥发物、化学演化、释气，冷却时发生收缩，最终或随宿主恒星死亡而被摧毁，或留存下来，并将物质抛回星际介质，进而可能开启新一轮循环。目前我们对该过程的认知大多源自太阳系研究与邻近恒星的天体物理观测。系外行星的探测与表征揭示了太阳系外丰富多样的行星系统，却也对现有行星形成理论提出了挑战。精准表征系外行星的整体性质，有助于为各异的形成条件与演化过程施加约束，从而深入理解系外行星的起源。本项目拟通过优化行星半径参数，对轨道周期大于15天的低质量富气体行星（定义为半径介于2至4倍地球半径的行星）开展表征研究。
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