Development of a high-precision spectrograph for diffraction-limited coronagraphs

Shunsuke Ota; Taro Matsuo; Satoshi Itoh; Tetso Kano; Yuji Ikeda; Reiki Kojima; Takashi Sukegawa; Tomonao Nakayasu; Masatsugu Koyama; Takahiri Sumi; Toru Yamada

doi:10.1117/12.2629324

29 August 2022 Development of a high-precision spectrograph for diffraction-limited coronagraphs

Shunsuke Ota, Taro Matsuo, Satoshi Itoh, Tetso Kano, Yuji Ikeda, Reiki Kojima, Takashi Sukegawa, Tomonao Nakayasu, Masatsugu Koyama, Takahiri Sumi, Toru Yamada

Author Affiliations +

Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 1218851 (2022) https://doi.org/10.1117/12.2629324
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

The atmospheric characterization of habitable candidates is one of the effective approaches for search for life out of the solar system. However, it is much hard by high planet-star flux contrast, 10^-8- 10^-10 . A coronagraphic mask proposed by Itoh & Matsuo (2020) can suppress host stellar light but is imposed by a strict wavelength range limit of 0.3%. A spectroscopic coronagraph that combines the diffraction-limited coronagraph with a spectrograph is expected to achieve enlarges the effective bandwidth. On the other hand, a non-common path error, which is induced by the spectrograph, could limit the achievable contrast. We designed a high-accuracy spectrograph motivated for the spectroscopic coronagraph and measured its wavefront error. The common path error is 9.9 nm RMS, which is mostly caused by the alignment error between the convex grating and spherical mirror of the spectrograph. The achievable contrast of the spectroscopic coronagraph was also estimated from the non-common path error measurement. We found that the contrast of 10^-8could be achieved with a bandwidth of 5%, which is a promising result as the first step.

Citation Download Citation

Shunsuke Ota, Taro Matsuo, Satoshi Itoh, Tetso Kano, Yuji Ikeda, Reiki Kojima, Takashi Sukegawa, Tomonao Nakayasu, Masatsugu Koyama, Takahiri Sumi, and Toru Yamada "Development of a high-precision spectrograph for diffraction-limited coronagraphs", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 1218851 (29 August 2022); https://doi.org/10.1117/12.2629324

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