CandY: Circumbinary And RockY

围绕双星系统的两颗恒星运行的行星——环双星行星——正在挑战我们对系外行星如何组装以及它们的轨道随后如何演变的认识。因为双星彼此绕着对方旋转，所以它们会干扰产生行星的核心吸积过程。但是，这两颗恒星并没有改变行星的数量，而是影响了环双星行星的质量和轨道距离，从而为行星形成过程真正重要的问题带来了意想不到的启示。通过其雄心勃勃的计划，CandY将巩固环双星作为系外行星科学不可避免的一个角落，对行星形成的研究以及系外大气的研究和解释至关重要。为了更好地理解行星的形成，CandY项目将对环绕双星的行星进行首次系统研究。CandY将开发一套新的分析方法，并进行三次雄心勃勃的观测活动，这些活动将导致探测到数十颗新的环双星行星，其中包括一些岩石质量的行星。与此同时，CandY团队将首次研究环双星行星的大气组成，以揭示更多关于这些奇异世界的线索。在CandY项目中，我们将记录每一个相似之处，以及环双星行星和绕单恒星运行的系外行星之间的任何差异。这种系统的练习将使我们对行星是如何产生的以及哪些过程主导了行星的组装和随后的轨道迁移的理解发生飞跃。此外，在系外行星中，环双星行星具有独特的轨道特性。它们的轨道动力学提高了它们经历凌日的可能性，从而简化了对大气层外的调查。此外，环状系外行星是唯一可以研究季节性大气变化的凌日行星。

Planets orbiting both stars of a binary system -circumbinary planets- are challenging what we think we knowabout how exoplanets are assembled, and how their orbits subsequently evolve. Because they orbit oneanother, binary stars disturb the process of core accretion that creates planets. But, instead of changing thenumber of planets created, the two stars instead affects circumbinary planets' masses and orbital separations,thus shining an unexpected light onto which planet formation processes are truly important. With itsambitious programme, CandY will consolidate circumbinary planets as an unavoidable corner ofexoplanetary science, crucial for the study of planet formation, and the study and interpretation of exoatmospheres.To better our understanding of planet formation, the CandY project will perform the first systematic study ofcircumbinary planets. CandY will develop a suite of new analytical methods, and conduct three ambitiousobserving campaigns that will lead to the detection of dozens of new circumbinary planets, including someall way down to rocky masses. In parallel, the CandY team will study the atmospheric composition ofcircumbinary planets for the very first time in order to reveal yet more clues about these exotic worlds.During the CandY project, we will record every similarity, and any difference between the population ofcircumbinary planets and the population of exoplanets orbiting single stars. This systematic exercise willcreate a leap in our understanding about how planets are produced and which processes dominate planetassembly and their subsequent orbital migration.In addition, circumbinary planets have unique orbital properties amongst exoplanets. Their orbital dynamicsboost their probability to experience transits easing exo-atmospheric investigations. Moreover, circumbinaryexoplanets are the only transiting planets for which seasonal atmospheric variations can be studied.