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Astrophysics at the University of Exeter

埃克塞特大学天体物理学

基本信息

批准号：
ST/V000721/1
负责人：
Matthew Bate
金额：
$ 168.34万
依托单位：
UNIVERSITY OF EXETER
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2021
资助国家：
英国
起止时间：
2021 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=ST%2FV000721%2F1
关键词：
Astrophysics University Exeter

项目摘要

Our research is focussed on improving our understanding of how stars, disks, and planets form and evolve, and of the physical processes that occur deep in the atmospheres and interiors of stars and exoplanets. We intend to achieve this goal by developing advanced theoretical models and using a combination of state-of-the art computer modelling and observations obtained from cutting-edge facilities.Stars and planets owe their origins to the gravitational collapse of molecular clouds, resulting in the formation of objects with a wide range of masses. As stars form, they are surrounded by discs of material, which feed the star with mass and are the birthplace of planets. How discs form and evolve, what determines their properties, and how accretion and planet formation proceeds, remain major unsolved questions. Combining different observational methods at various wavelengths and sophisticated computer modelling that include complex physics, we will study in depth all steps, starting from the properties of molecular clouds, that lead to the formation of stars, discs and planets.After stars and sub-stellar objects form, their further evolution is characterised by complex physical processes, such as turbulent convection and magnetism, that shape their internal structure and their observational properties. Exquisite observational data are now available, with for example asteroseismology providing important constrainsts on the internal structure of stars. We will develop theoretical models and use sophisticated numerical models to improve our understanding of stellar interiors, atmospheres, magnetism, and rotation and to explain various observational puzzles.We will also develop new observational techniques, carry out new observations, and build new theoretical models for detecting, characterising, and understanding exoplanets. We will also develop original strategies to optimise the detection of small (Earth-sized) exoplanets by understanding and learning how to see through activity "noise" from the host star. We expect to lead the first images and spectra of directly-observable exoplanets using the James Webb Space Telescope. To describe the physical properties of exoplanet atmospheres, we use the Met Office's computer model for the Earth's climate, which has been specially adapted to deal with the different physical process that occur in exoplanet atmospheres. We will also develop new tools to understand the detailed atmospheric chemistry of irradiated exoplanets and which will be optimised to interpret observations.

我们的研究重点是提高我们对恒星、磁盘和行星如何形成和演化的理解，以及对发生在大气层深处、恒星和系外行星内部的物理过程的理解。我们打算通过开发先进的理论模型，并结合最先进的计算机建模和从尖端设施获得的观测结果来实现这一目标。恒星和行星的起源要归功于分子云的引力坍缩，从而形成了质量范围很广的物体。当恒星形成时，它们被物质盘所包围，这些物质盘为恒星提供质量，是行星的诞生地。圆盘是如何形成和演化的，是什么决定了它们的性质，以及吸积和行星形成是如何进行的，这些都是尚未解决的主要问题。结合不同波长的不同观测方法和复杂的计算机建模，包括复杂的物理学，我们将深入研究所有步骤，从分子云的性质开始，导致恒星，圆盘和行星的形成。恒星和亚恒星天体形成后，它们的进一步演化以复杂的物理过程为特征，如湍流对流和磁性，这些过程塑造了它们的内部结构和观测特性。现在有了精确的观测数据，例如星震学对恒星的内部结构提供了重要的约束。我们将建立理论模型，并使用复杂的数值模型来提高我们对恒星内部、大气、磁力和自转的理解，并解释各种观测难题。我们还将开发新的观测技术，开展新的观测，建立新的理论模型，以探测、表征和理解系外行星。我们还将通过理解和学习如何透过来自主恒星的活动“噪音”来制定原始策略，以优化对小型（地球大小）系外行星的探测。我们希望利用詹姆斯·韦伯太空望远镜率先拍摄到可直接观测到的系外行星的图像和光谱。为了描述系外行星大气的物理特性，我们使用了英国气象局的地球气候计算机模型，该模型已经过专门调整，以处理系外行星大气中发生的不同物理过程。我们还将开发新的工具来了解受辐射系外行星的详细大气化学，并将其优化以解释观测结果。

项目成果

期刊论文数量（9）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Near-IR and optical radial velocities of the active M dwarf star Gl 388 (AD Leo) with SPIRou at CFHT and SOPHIE at OHP A 2.23 day rotation period and no evidence for a corotating planet

活跃的 M 矮星 GL 388（AD Leo）的近红外和光学径向速度，SPIRou 位于 CFHT，SOPHIE 位于 OHP 自转周期为 2.23 天，没有证据表明存在共转行星

DOI：
10.1051/0004-6361/202245660
发表时间：
2023
期刊：
Astronomy & Astrophysics
影响因子：
6.5
作者：
Carmona A
通讯作者：
Carmona A

A study of convective core overshooting as a function of stellar mass based on two-dimensional hydrodynamical simulations

DOI：
10.1093/mnras/stad009
发表时间：
2023-03-01
期刊：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
影响因子：
4.8
作者：
Baraffe, I;Clarke, J.;Pratt, J.
通讯作者：
Pratt, J.

Impact of a new H/He equation of state on the evolution of massive brown dwarfs. New determination of the hydrogen burning limit

新的 H/He 状态方程对大质量褐矮星演化的影响。

DOI：
10.48550/arxiv.2212.07153
发表时间：
2022
期刊：
影响因子：
0
作者：
Chabrier G
通讯作者：
Chabrier G

The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems I: High-contrast Imaging of the Exoplanet HIP 65426 b from 2 to 16 μm

JWST 早期发布的直接观测系外行星系统的科学计划 I：系外行星 HIP 65426 b 从 2 到 16 μm 的高对比度成像

DOI：
10.3847/2041-8213/acd93e
发表时间：
2023
期刊：
The Astrophysical Journal Letters
影响因子：
0
作者：
Carter, Aarynn L.;Hinkley, Sasha;Kammerer, Jens;Skemer, Andrew;Biller, Beth A.;Leisenring, Jarron M.;Millar-Blanchaer, Maxwell A.;Petrus, Simon;Stone, Jordan M.;Ward-Duong, Kimberly
通讯作者：
Ward-Duong, Kimberly

Impact of a new H/He equation of state on the evolution of massive brown dwarfs New determination of the hydrogen burning limit

新的 H/He 状态方程对大质量褐矮星演化的影响氢燃烧极限的新确定