论文标题
Theia：将来的科学案例和任务概况，以实现高精度天文标准
Theia : science cases and mission profiles for high precision astrometry in the future
论文作者
论文摘要
远远超出盖亚（Gaia）的能力，高精度的天文学将为实现天体物理突破，尤其是关于暗物质的性质以及对附近可居住的系外行星的完整调查提供独特的方式。在这项贡献中，我们提出了需要灵活的仪器的科学案例，这些案例需要具有较高天体准确性的灵活指示仪器，并且我们审查了可以通过当前空间技术以及在太空机构定义的边界条件下实现此类观察的最佳任务概况。我们还描述了使用场中的参考恒星进行差异星形测量的方式。我们表明，可以在望远镜稳定性的情况下达到最终精度。
High-precision astrometry well beyond the capacities of Gaia will provide a unique way to achieve astrophysical breakthroughs, in particular on the nature of dark matter, and a complete survey of nearby habitable exoplanets. In this contribution, we present the scientific cases that require a flexibly-pointing instrument capable of high astrometric accuracy and we review the best mission profiles that can achieve such observations with the current space technology as well as within the boundary conditions defined by space agencies. We also describe the way the differential astrometric measurement is made using reference stars within the field. We show that the ultimate accuracy can be met without drastic constrains on the telescope stability.
