ALADDIN: an optimized nulling ground-based demonstrator for DARWIN

The ESA Darwin space mission will require a ground based precursor to i/ demonstrate nulling interferometry in an operational context and ii/ carry out some precursor science, such as the characterization of the level of exozodiacal light around the main Darwin targets. These are the stated objectiv...

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Bibliographic Details
Published in:SPIE Proceedings, Advances in Stellar Interferometry
Main Authors: Coudé du Foresto, V., Absil, Olivier, Swain, M., Vakili, F., Barillot, M.
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
Antarc*
Antarctic
Online Access:https://orbi.uliege.be/handle/2268/109750
https://orbi.uliege.be/bitstream/2268/109750/1/6268_37.PDF
https://doi.org/10.1117/12.672370
Description
Summary:The ESA Darwin space mission will require a ground based precursor to i/ demonstrate nulling interferometry in an operational context and ii/ carry out some precursor science, such as the characterization of the level of exozodiacal light around the main Darwin targets. These are the stated objectives of the GENIE nulling instrument that was studied for the VLTI. We argue here that the same objectives can be met in a more efficient way by an antarctic-based nulling experiment. The ALADDIN mission concept is an integrated L-band nulling breadboard with relatively modest collectors (1m) and baseline (40m). Because of its privileged location, this is suffcient to achieve a sensitivity (in terms of detectable zodi levels) which is 1.6 to 3.5 times better than GENIE at the VLTI, bringing it below the 20-zodi threshold value identified to carry out the Darwin precursor science. The integrated design enables top-level optimization and full access to the light collectors for the duration of the experiment, while reducing the complexity of the nulling breadboard.

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