Mid-infrared high-resolution spectrograph for SPICA

Naoto Kobayashi; Yuji Ikeda; Hideyo Kawakita; Keigo Enya; Takao Nakagawa; Hirokazu Kataza; Hideo Matsuhara; Yasuhiro Hirahara; Hitoshi Tokoro

doi:10.1117/12.799423

12 July 2008 Mid-infrared high-resolution spectrograph for SPICA

Naoto Kobayashi, Yuji Ikeda, Hideyo Kawakita, Keigo Enya, Takao Nakagawa, Hirokazu Kataza, Hideo Matsuhara, Yasuhiro Hirahara, Hitoshi Tokoro

Author Affiliations +

Proceedings Volume 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter; 701032 (2008) https://doi.org/10.1117/12.799423
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

We present a preliminary optical design and layout for the mid-infrared (4-18 μm) high-resolution spectrograph for SPICA, Japanese next-generation space IR observatory with 3.5 m telescope. MIR high-resolution spectroscopy is a powerful probe to study gas-phase molecules/atoms in a variety of astronomical objects. Space observation provides a great opportunity to study many molecular lines especially in between the atmospheric windows. SPICA gives us a chance to realize MIR high-resolution spectroscopy from space with the large telescope aperture. The major technical challenge is the size of the spectrograph, which tends to be too large for space. We hope to overcome this problem with a novel MIR immersion grating, which can make the instrument smaller by a factor of the refractive index of the grating material. We plan to fabricate a large pitch ZnSe (n = 2.4) immersion grating with the fly-cutting technique at LLNL (see Poster paper 7018-183 by Ikeda et al.¹ and 7018-181 by Kuzmenko et al.² in the proceedings of this conference). We show our preliminary spectrograph designs with a spectral resolution of ~30,000 in 4-8 μm (short mode) and 12-18 μm (long mode). The instrument size can be as small as 200 × 400 mm thanks to the MIR immersion gratings. With unprecedented spectral resolution in space, which is 10-times higher than ISO-SWS, the high-resolution spectrograph for SPICA (SPICA-HIRES) could be a unique instrument that can provide most sensitive and clear spectra of this kind.

Citation Download Citation

Naoto Kobayashi, Yuji Ikeda, Hideyo Kawakita, Keigo Enya, Takao Nakagawa, Hirokazu Kataza, Hideo Matsuhara, Yasuhiro Hirahara, and Hitoshi Tokoro "Mid-infrared high-resolution spectrograph for SPICA", Proc. SPIE 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 701032 (12 July 2008); https://doi.org/10.1117/12.799423

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available