Theia: Faint objects in motion or the new astrometry frontier
The Theia Collaboration, Celine Boehm, Alberto Krone-Martins, Antonio Amorim, Guillem Anglada-Escude, Alexis Brandeker, Frederic Courbin, Torsten Ensslin, Anton… 展开作者
The Theia Collaboration, Celine Boehm, Alberto Krone-Martins, Antonio Amorim, Guillem Anglada-Escude, Alexis Brandeker, Frederic Courbin, Torsten Ensslin, Antonio Falcao, Katherine Freese, Berry Holl, Lucas Labadie, Alain Leger, Fabien Malbet, Gary Mamon, Barbara McArthur, Alcione Mora, Michael Shao, Alessandro Sozzetti, Douglas Spolyar, Eva Villaver, Conrado Albertus, Stefano Bertone, Herve Bouy, Michael Boylan-Kolchin, Anthony Brown, Warren Brown, Vitor Cardoso, Laurent Chemin, Riccardo Claudi, Alexandre C. M. Correia, Mariateresa Crosta, Antoine Crouzier, Francis-Yan Cyr-Racine, Mario Damasso, Antonio da Silva, Melvyn Davies, Payel Das, Pratika Dayal, Miguel de Val-Borro, Antonaldo Diaferio, Adrienne Erickcek, Malcolm Fairbairn, Morgane Fortin, Malcolm Fridlund, Paulo Garcia, Oleg Gnedin, Ariel Goobar, Paulo Gordo, Renaud Goullioud, Nigel Hambly, Nathan Hara, David Hobbs, Erik Hog, Andrew Holland, Rodrigo Ibata, Carme Jordi, Sergei Klioner, Sergei Kopeikin, Thomas Lacroix, Jacques Laskar, Christophe Le Poncin-Lafitte, Xavier Luri, Subhabrata Majumdar, Valeri Makarov, Richard Massey, Bertrand Mennesson, Daniel Michalik, Andre Moitinho de Almeida, Ana Mourao, Leonidas Moustakas, Neil Murray, Matthew Muterspaugh, Micaela Oertel, Luisa Ostorero, Angeles Perez-Garcia, Imants Platais, Jordi Portell i de Mora, Andreas Quirrenbach, Lisa Randall, Justin Read, Eniko Regos, Barnes Rory, Krzysztof Rybicki, Pat Scott, Jean Schneider, Jakub Scholtz, Arnaud Siebert, Ismael Tereno, John Tomsick, Wesley Traub, Monica Valluri, Matt Walker, Nicholas Walton, Laura Watkins, Glenn White, Dafydd Wyn Evans, Lukasz Wyrzykowski, Rosemary Wyse
In the context of the ESA M5 (medium mission) call we proposed a new satellite mission, Theia, based on relative astrometry and extreme precision to study the motion of very faint objects in the Universe. Theia is primarily designed to study the local dark matter properties, the existence of Earth-like exoplanets in our nearest star systems and the physics of compact objects. Furthermore, about 15 $\%$ of the mission time was dedicated to an open observatory for the wider community to propose complementary science cases. With its unique metrology system and "point and stare" strategy, Theia's precision would have reached the sub micro-arcsecond level. This is about 1000 times better than ESA/Gaia's accuracy for the brightest objects and represents a factor 10-30 improvement for the faintest stars (depending on the exact observational program). In the version submitted to ESA, we proposed an optical (350-1000nm) on-axis TMA telescope. Due to ESA Technology readiness level, the camera's focal plane would have been made of CCD detectors but we anticipated an upgrade with CMOS detectors. Photometric measurements would have been performed during slew time and stabilisation phases needed for reaching the required astrometric precision.
Pushing Point spread function reconstruction to the next level. Application to SPHERE/ZIMPOL
点扩散函数（PSF）重建（PSF-R）是一种成熟的技术，用于从自适应光学（AO）控制回路数据可靠且准确地确定PSF。我们已经成功地应用这种技术，以提高精度的测光和天体测量的观测NGC 6121获得的SPHERE/ZIMPOL，因为它将在即将到来的信。首先，我们介绍了使用我们的PSF-R方法PRIME（Beltramo-Martin et al. 2019）结合光瞳平面和焦平面测量重建PSF的方法，与之前的论文相比，模型和最佳拟合步骤都进行了升级。其次，我们强调，PRIME允许保持PSF拟合残差低于0.2%，超过2小时的观察，仅使用30秒的AO遥测，这可能对未来30-40米级望远镜的PSF-R遥测存储的重要后果。最后，我们部署PRIME在一个更现实的制度，使用微弱的恒星，以确定所需的精度对初始猜测参数，以确保收敛到最优解。
A PINK update: Improvements to the CELEBI fast radio burst data reduction and analysis pipeline
Institute for Astronomy, University of Edinburgh（爱丁堡大学天体物理研究所）；Centre for Astrophysics and Supercomputing, Swinburne University of Technology（斯威本科技大学天文与超级计算中心）；International Centre for Radio Astronomy Research, Curtin University（科廷大学国际射电天文研究中心）；Australia Telescope National Facility, CSIRO（澳大利亚望远镜国家设施，CSIRO）；Univ Rennes, INSA Rennes, CNRS, IETR - UMR 6164（雷恩大学，雷恩国立应用科学学院，法国国家科学研究中心，IETR - UMR 6164）；Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA) and Department of Physics and Astronomy, Northwestern University（西北大学天体物理学跨学科探索与研究中心（CIERA）及物理与天文学系）
