[P-CG19] 惑星大気圏・電磁圏

[PCG19-01] LAPYUTA計画の検討状況

*土屋 史紀¹、村上 豪²、山崎 敦²、亀田 真吾³、鍵谷 将人¹、吉岡 和夫⁴、古賀 亮一⁵、木村 淳⁶、木村 智樹⁷、垰 千尋⁸、益永 圭⁹、堺 正太朗¹、中山 陽史³、生駒 大洋¹⁰、成田 憲保⁴、大内 正己^4,10、田中 雅臣¹、桑原 正輝³、鳥海 森²、野津 湧太¹¹、行方 宏介¹² (1.東北大、2.宇宙科学研究所、3.立教大、4.東大、5.名古屋市立大、6.阪大、7.東京理科大、8.情報通信研究機構、9.山形大、10.国立天文台、11.コロラド大、12.京大)

The LAPYUTA mission aims "to explore the habitable environment of the Universe" and "to understand the origin of matter and space in the Universe”. From unresolved issues related to the two goals, we selected four scientific objectives to be addressed in the 2030s: (1) habitable environments of solar system bodies, (2) atmospheres of exoplanets, (3) galaxy formation, and (4) the origin of heavy elements, which will be realized by the ultraviolet space telescope. LAPYUTA was selected as one of candidates of JAXA’s M-class mission, and aims to realize a high-resolution, high-sensitivity ultraviolet telescope by optimizing the performance requirements to the science objectives. The instrument will measure in the vacuum ultraviolet wavelength range of 110-190 nm, including hydrogen, oxygen and carbon emission lines. The focal plane instrument consists of a medium dispersion spectrograph MRS (resolution ∼6,000), a high dispersion spectrograph HRS (∼40,000), a UV slit imager UVSI and a wide-field fine guide sensor FGS. To achieve an effective area of 350 cm2 and a resolution of 0.1 arcsec, a primary mirror with aperture of 60 cm, a high reflectance coating process, and a highly efficient diffraction grating are under development. The HRS aims to achieve a wavelength resolution of 3 pm using an echelle grating. In addition, a high-sensitivity, large-size detector is being developed to achieve both a field of view (3 arcmin), spatial resolution and high wavelength resolution. The coating process to achieve high efficiency and the development of a large detector are technology demonstrations aimed at participation in the HWO. This paper introduces the scientific background and status of the LAPYUTA mission.