Infrared photometry with InGaAs detectors: first light with SPECULOOS

Peter P. Pedersen; Didier Queloz; Lionel Garcia; Yannick Schacke; Laetitia Delrez; Brice-Olivier Demory; Elsa Ducrot; Georgina Dransfield; Michael Gillon; Matthew J. Hooton; Clàudia Janó-Muñoz; Emmanuël Jehin; Daniel Sebastian; Mathilde Timmermans; Samantha Thompson; Amaury H. M. J. Triaud; Julien de Wit; Sebastián Zúñiga-Fernández

doi:10.1117/12.3018320

18 July 2024 Infrared photometry with InGaAs detectors: first light with SPECULOOS

Peter P. Pedersen, Didier Queloz, Lionel Garcia, Yannick Schacke, Laetitia Delrez, Brice-Olivier Demory, Elsa Ducrot, Georgina Dransfield, Michael Gillon, Matthew J. Hooton, Clàudia Janó-Muñoz, Emmanuël Jehin, Daniel Sebastian, Mathilde Timmermans, Samantha Thompson, Amaury H. M. J. Triaud, Julien de Wit, Sebastián Zúñiga-Fernández

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130963X (2024) https://doi.org/10.1117/12.3018320
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

We present the photometric performance of SPIRIT, a ground-based near-infrared InGaAs CMOS-based instrument (1280 by 1024 pixels, 12 μm pitch), using on-sky results from the SPECULOOS-Southern Observatory during 2022 – 2023. SPIRIT was specifically designed to optimise time-series photometric precision for observing late M and L type stars. To achieve this, a custom wide-pass filter (0.81 – 1.33 μm, zYJ ) was used, which was also designed to minimise the effects of atmospheric precipitable water vapour (PWV) variability on differential photometry. Additionally, SPIRIT was designed to be maintenance-free by eliminating the need for liquid nitrogen for cooling. We compared SPIRIT’s performance with a deeply-depleted (2048 by 2048 pixels, 13.5 μm pitch) CCD-based instrument (using an I+z’ filter, 0.7 – 1.1 μm) through simultaneous observations. For L type stars and cooler, SPIRIT exhibited better photometric noise performance compared to the CCD-based instrument. The custom filter also significantly minimised red noise in the observed light curves typically introduced by atmospheric PWV variability. In SPIRIT observations, the detector’s read noise was the dominant limitation, although in some cases, we were limited by the lack of comparison stars.

Citation Download Citation

Peter P. Pedersen, Didier Queloz, Lionel Garcia, Yannick Schacke, Laetitia Delrez, Brice-Olivier Demory, Elsa Ducrot, Georgina Dransfield, Michael Gillon, Matthew J. Hooton, Clàudia Janó-Muñoz, Emmanuël Jehin, Daniel Sebastian, Mathilde Timmermans, Samantha Thompson, Amaury H. M. J. Triaud, Julien de Wit, and Sebastián Zúñiga-Fernández "Infrared photometry with InGaAs detectors: first light with SPECULOOS", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130963X (18 July 2024); https://doi.org/10.1117/12.3018320

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