[P-EM11] 系外惑星

[PEM11-21] Development of detector calibration techniques for planet search with JASMINE

*多田 将太朗¹、小谷 隆行^2,3,1、鹿野 良平³、宮川 浩平³、片坐 宏一⁴、河原 創⁴、和田 武彦⁴、臼井 文彦⁴、郷田 直輝³ (1.総合研究大学院大学、2.アストロバイオロジーセンター、3.国立天文台、4.宇宙航空研究開発機構)

JASMINE (Japan Astrometry Satellite Mission for INfrared Exploration) is a satellite mission aimed for launch in 2028. Its main mission is to conduct astrometry of the galactic center and search for Earth-like planets in the habitable zone of M-type stars. One of the key factors affecting the precision of these observations is the variation in sensitivity between detector pixels. Correcting for this variation is particularly important in planet searches, where small changes in brightness due to the transit of planets must be detected. Sensitivity variation can lead to false brightness changes due to celestial object movement on the detector caused by the satellite's attitude fluctuations.
To address this issue, we are developing on-orbit flat field correction technology capable of correcting sensitivity variation, including the effects of aging. Single-mode fibers are used in this method because they have a well-known and stable light output pattern.
Additionally, we are studying measurement techniques using interference fringes created by the light emitted from two single-mode fibers. This measurement can detect pixel center shift and variation in pixel size, which also affect photometric and astrometric precision. We are planning ground-based measurements before launch because these characteristics seem to show little change over time.
This presentation will provide a detailed explanation of these techniques and an update on the demonstration experiment currently in preparation.