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21 July 2010 Toward the stability required for direct observations of exoplanets with nulling interferometry technique
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Abstract
In the literature you could find requirements for nulling IR interferometry in terms of nulling ratio nl and stability of this nulling ratio σnl for the observation of a exo-Earth gravitating at 1au of a solar type star located at 10pc from the Earth: nl = 10-5 between 7 and 20um and σnl = 3•10-9 over 10 days.1 These requirements are very demanding. We report on studies made to obtain the technological requirements in terms of nulling ratio and stability of this nulling ratio in function of the targeted planets and stars. Finally we will present methods of dithering developed for the NULLTIMATE testbench to achieve to the maximum stability.
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Olivier Demangeon, Peter A. Schuller, Alain Léger, and Philippe Duret "Toward the stability required for direct observations of exoplanets with nulling interferometry technique", Proc. SPIE 7734, Optical and Infrared Interferometry II, 77342R (21 July 2010); https://doi.org/10.1117/12.857209
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