Conceptual design of the ALADDIN Antarctic nulling interferometer

It is commonly accepted that highly challenging planet finding missions such as Darwin and TPF need precursors on the ground, for both technological demonstration and study of the exozodiacal clouds around potential targets. A first instrument, GENIE, designed to be implemented in the interferometri...

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Bibliographic Details
Published in:SPIE Proceedings, Advances in Stellar Interferometry
Main Authors: Barillot, Marc, Courteau, Pascal, Absil, Olivier, Coudé du Foresto, Vincent, Swain, Mark
Format: Conference Object
Language:English
Published: SPIE 2006
Subjects:
Physical
chemical
mathematical & earth Sciences
Space science
astronomy & astrophysics
Physique
chimie
mathématiques & sciences de la terre
Aérospatiale
astronomie & astrophysique
Antarctic
Antarc*
Antarctica
Online Access:https://orbi.uliege.be/handle/2268/109765
https://orbi.uliege.be/bitstream/2268/109765/1/6268_113.PDF
https://doi.org/10.1117/12.671722
Description
Summary:It is commonly accepted that highly challenging planet finding missions such as Darwin and TPF need precursors on the ground, for both technological demonstration and study of the exozodiacal clouds around potential targets. A first instrument, GENIE, designed to be implemented in the interferometric laboratory of the VLTI, was studied by ESA and scientific/industrial teams. In this paper we present a concept for ALADDIN, an operational nulling instrument to be implemented at Dome C in Antarctica, and discuss the comparison with GENIE from the instrumental point of view. Our preliminary design involves moderate ~1m size telescopes mounted on a 40m long rotating beam allowing baselines up to 30m and feeding a 2-arm nulling beam combiner. When compared to GENIE, the rotating beam design has the advantage of removing the need for both long-stroke delay line and dispersion control equipments. As a side effect, the instrumental arrangement of ALADDIN finds itself more representative of what Darwin will be. Furthermore, critical issues like phase control, photometric balance and instrumental background suppression are expected to be relaxed by the improved atmospheric conditions, lower temperature, and simpler optical trains. Calibration of geometrical stellar leakage will make advantage of the continuously adjustable baseline. As results, a simpler instrument showing improved performance is expected. In conclusion, we see our ALADDIN concept as a valuable alternative to GENIE, with a quite stronger scientific potential and a considerably simplified instrumental design.

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