CHARA阵列上MIRC-X与MYSTIC的近期及即将进行的升级
Recent and Upcoming Upgrades for MIRC-X and MYSTIC on the CHARA Array
AI总结：
本文介绍了CHARA阵列上MIRC-X和MYSTIC两台近红外合束器的多项软硬件升级计划，旨在提升观测效率与灵敏度，预期J+H波段提高0.4等、K波段提高1等。
摘要：
MIRC-X和MYSTIC是位于美国加州威尔逊山CHARA阵列上的六望远镜近红外光束（1.08-2.38微米）合束器。自2018年MIRC-X（J和H波段）和2021年MYSTIC（K波段）投入使用以来，它们一直是该阵列上最受欢迎且超额申请最多的仪器。观测者已能在最佳条件下对恒星目标进行成像，H波段灵敏度可达8.1等，K波段灵敏度可达7.8等。2022年，MYSTIC升级了新的ABCD模式，采用VLTI/GRAVITY 4光束集成光学芯片，目标是提高灵敏度和定标精度。ABCD模式已被用于观测20多颗T Tauri星；然而，数据处理管线仍在开发中。除软件升级外，本文详细介绍了对两台仪器计划进行的升级。主要升级包括：1）为MIRC-X增加电动滤光轮以及新的高光谱分辨率模式；2）更新MIRC-X光学系统以实现同时进行6望远镜J+H波段观测；3）移除MYSTIC中光谱仪与热光学器件之间的暖窗口；4）与CHARA/SPICA合作，为MIRC-X增加6望远镜ABCD模式；5）更新由埃克塞特大学Kraus教授资助的MIRC-X CRED-ONE相机；6）开展MIRC-X偏振模式的科学验证；7）开发用于ABCD模式数据归算的新软件以及更高效的定标流程。我们预期这些升级不仅能改善观测体验，还能将J+H波段灵敏度提高0.4等，K波段灵敏度提高1等。
英文摘要：
MIRC-X and MYSTIC are six-telescope near-infrared beam (1.08-2.38 $μ$m) combiners at the CHARA Array on Mt Wilson CA, USA. Ever since the commissioning of MIRC-X (J and H bands) in 2018 and MYSTIC (K bands) in 2021, they have been the most popular and over-subscribed instruments at the array. Observers have been able to image stellar objects with sensitivity down to 8.1 mag in H and 7.8 mag in K-band under the very best conditions. In 2022 MYSTIC was upgraded with a new ABCD mode using the VLTI/GRAVITY 4-beam integrated optics chip, with the goal of improving the sensitivity and calibration. The ABCD mode has been used to observe more than 20 T Tauri stars; however, the data pipeline is still being developed. Alongside software upgrades, we detail planned upgrades to both instruments in this paper. The main upgrades are: 1) Adding a motorized filter wheel to MIRC-X along with new high spectral resolution modes 2) Updating MIRC-X optics to allow for simultaneous 6T J+H observations 3) Removing the warm window between the spectrograph and the warm optics in MYSTIC 4) Adding a 6T ABCD mode to MIRC-X in collaboration with CHARA/SPICA 5) Updating the MIRC-X CRED-ONE camera funded by Prof. Kraus from U. Exeter 6) Carrying out science verification of the MIRC-X polarization mode 7) Developing new software for ABCD-mode data reduction and more efficient calibration routines. We expect these upgrades to not only improve the observing experience, but also increase the sensitivity by 0.4 mag in J+H-bands, and 1 mag in K-band.
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