The infrared spectrometer for Twinkle

Martyn Wells

doi:10.1117/12.2232046

29 July 2016 The infrared spectrometer for Twinkle

Martyn Wells

Proceedings Volume 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave; 99044N (2016) https://doi.org/10.1117/12.2232046
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

Twinkle is a small satellite mission to observe the atmospheres of exoplanets in the visible to near infrared. This paper describes the design of the infrared (1.3 to 4.5 micron) spectrometer which works at the diffraction limit of the 450mm diameter telescope and at a resolving power of 300 (1.3-2.4 microns) and, in order to achieve the required SNR, R=30 for 2.4-4.5 microns. The planetary spectrum is obtained by taking differences between the spectra of star + planet at different phases of the planet’s orbit so there is an emphasis of spectral and radiometric stability. The design incorporates a number of features to enhance this stability - compact all aluminium structure and mirror substrates to reduce alignment offsets when cooled to the operating temperature of ~100K - pupil imaging in the across dispersion direction to minimise changes due to sub-pixel variations in sensitivity and reduce the number of illuminated pixels for background measurements

Citation Download Citation

Martyn Wells "The infrared spectrometer for Twinkle", Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99044N (29 July 2016); https://doi.org/10.1117/12.2232046

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