Circumbinary planets from space-based transiting planet surveys

来自天基凌日行星调查的绕双星行星

• 批准号: 2881369
• 金额: --
• 依托单位: University of Warwick
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2881369
• 关键词: Circumbinary; planets; space; based; transiting

Planets orbiting stellar multiples are a popular science fiction trope, but while detection of the first exoplanet around a Sun-like star was confirmed in 1995, the first circumbinary planet was only announced in 2011.Since that announcement other circumbinary planets (or CBPs) have been found through transit detection, eclipse timing, and microlensing, but the number of known CBPs is still very small compared to the total number of known exoplanets. This limits our ability to investigate the formation and evolution of CBP systems, which may be very different from the similar processes for single-star planetary systems. The limited number of known CBPs also restricts our knowledge of the underlying parameter distributions, and the current sample is affected by strong observational biases.Most of the known transiting CBPs were discovered by NASA's Kepler mission, but since that mission's unfortunate demise the search has been taken up by NASA's TESS satellite, which has produced some recent new discoveries. In the future, ESA's PLATO mission is also likely to detect new CBPs and expand our sample of these interesting systems.However, detection of a transiting circumbinary requires more fortuitous timing than is the case for single-star systems. Not only are the planet's transits dwarfed by the stellar eclipses, but the gravitational interactions between the host binary stars and the orbiting planet lead to rapid orbital precession. Thus, nearly all of the currently known transiting CBPs will, in fact, cease transiting at some point. The process is periodic, however, and given long enough all will eventually transit once more. This also means that previously non-transiting CBPs may appear around apparently planetless eclipsing binaries.This project will explore the fascinating world of circumbinary planets, focusing on the use of data from space-based observatories to study those that transit one or both of their host stars. The project will start by searching for circumbinary planet candidates in TESS observations of eclipsing binaries. These could be short-period planets with many detectable transits, or single-transit events indicative of planets on orbits misaligned with their host binary, or even non-transiting CBPs detected through eclipse timing variations. Following their identification, candidate CBPs will be modelled to produce preliminary estimates of their characteristics and predict their future evolution, and further observations will be sought to confirm that the candidates are real and improve their characterisation. Further avenues of work could include extension of the search to data from Kepler and K2, or simulation of CBP systems to evaluate their detectability and constrain the likelihood of planets being present in known eclipsing binary systems. Methods for optimising detection and analysis of CBPs, and the potential yield of CBPs from PLATO, may also be explored using simulated data.

旋转恒星倍数的行星是一种流行的科幻小说，但是尽管在1995年证实了对阳光般的恒星周围的第一个系外行星的检测，但仅在2011年才宣布了第一个环球行星。由于公告其他循环行星（或CBP）是通过发现的，但已通过eclips nige toction toction nige nige of cobs nige nige cons nige of cobs necbs，但cb的数字仍然很小。系外行星。这限制了我们研究CBP系统的形成和演变的能力，CBP系统可能与单星行星系统的相似过程大不相同。已知的CBP数量有限，还限制了我们对潜在参数分布的了解，并且当前样本受到强烈的观察性偏见的影响。大多数已知的过境CBP都被NASA的Kepler任务发现，但是由于该任务不幸的衰落已经消失了，因此搜索已受到NASA的苔丝卫星的最新发现，从而产生了一些新的发现，这使得搜索。将来，ESA的柏拉图任务还可能检测到新的CBP并扩展我们的这些有趣系统的样本。但是，与单星系统相比，检测到过境环境需要更多的偶然时机。行星的过渡不仅被恒星的日食所吸引，而且宿主二进制恒星与轨道行星之间的重力相互作用导致了快速的轨道前进。因此，实际上，几乎所有当前已知的过境CBP都会在某个时候停止过境。但是，该过程是周期性的，并且给出足够长的时间最终将再次过境。这也意味着以前非传输的CBP可能出现在显然无行星的黯然失色的二进制文件周围。该项目将探索迷人的环形行星世界，重点是使用基于空间的观测站的数据来研究那些过境一个或两个宿主星星的人。该项目将首先搜索苔丝观察到黯然失色的二进制文件的候选候选者。这些可以是短期的行星，具有许多可检测到的横式，也可以是单次透射事件，指示与宿主二进制偏对的轨道上的行星，甚至是通过日食定时变化检测到的非传输CBP。鉴定后，将对候选CBP进行建模，以产生其特征的初步估计并预测其未来的进化，并寻求进一步的观察结果，以确认候选人是真实的并改善了其特征。工作的进一步途径可能包括将搜索扩展到Kepler和K2的数据，或者对CBP系统的模拟来评估其可检测性并限制已知的Ecreling二进制系统中存在行星的可能性。还可以使用模拟数据来探索优化CBP的检测和分析以及CBP的潜在产率的方法。