Next-Gen modelling for high-precision exoplanet microlensing surveys

用于高精度系外行星微透镜勘测的下一代建模

• 批准号: 2107389
• 金额: --
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2107389
• 关键词: Next; Gen; modelling; precision; exoplanet

The abundance of exoplanets not bound to any star, floating in the interstellar medium, known asfree floating planets (FFPs) is currently poorly constrained. Direct imaging has provided severalconfirmed FFPs, but does not allow us to extract FFP statistics. Via the gravitational microlensingmethod, we are more likely to find these illusive objects due to the methods invariability to the lensflux. Nonetheless, microlensing surveys have also provided only a handful of candidates. This is dueto the comparatively small masses of FFPs, on similar scales to planet masses, and thecorrespondingly short timescale of microlensing events. Upcoming surveys such as by the LargeSynoptic Survey Telescope (LSST) and the Wide Field Infrared Survey Telescope (WFIRST) couldprovide unprecedented detail on the galactic population of FFPs and also allow for properties such asFFP mass measurements to be made, also providing insight into planetary formation. To this end, theproject will focus on developing an FFP search strategy for the LSST and WFIRST. This will involvedeveloping more a more rigorous calculation of the microlensing optical depth, as well asinvestigating the potential for FFP mass measurements given the technology of the respectivetelescopes.

在星际介质中漂浮的不与任何恒星绑定的系外行星的丰度，被称为自由浮动行星(FFP)，目前受到的限制很少。直接成像提供了几个确认的FFP，但不允许我们提取FFP统计数据。通过引力微透镜方法，由于方法对透镜通量的不变性，我们更有可能找到这些虚幻物体。尽管如此，微透镜调查也只提供了少数几个候选者。这是由于FFP的质量相对较小，其规模与行星质量相似，并且相应地微透镜事件的时间尺度也相对较短。即将进行的观测，如大型天文巡天望远镜(LSST)和广域红外巡天望远镜(WFIRST)，可以提供关于FFP银河系人口的前所未有的细节，还可以进行FFP质量测量等属性，也提供了对行星形成的洞察。为此，该项目将侧重于为LSST和WFIRST制定FFP搜索战略。这将涉及开发更严格的微透镜光学厚度的计算，以及研究在各自的望远镜技术下进行FFP质量测量的可能性。

项目成果

MaBµlS-2: high-precision microlensing modelling for the large-scale survey era

MaB µlS-2：大规模测量时代的高精度微透镜建模

• DOI: 10.1093/mnras/staa2375
• 发表时间: 2020
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Specht D