High dynamic range interferometric observations of exozodiacal discs: performance comparison between ground, space, and Antarctica

• Published in: SPIE Proceedings, Optical and Infrared Interferometry
• Main Authors: Absil, Olivier, Defrere, Denis, Coudé du Foresto, Vincent, Di Folco, Emmanuel, den Hartog, Roland, Augereau, Jean-Charles
• Format: Conference Object
• Language: English
• Published: SPIE 2008
• Subjects: Exozodiacal dust; Infrared interferometry; Nulling interferometry; High-dynamic range observations; Physical; chemical; mathematical & earth Sciences; Space science; astronomy & astrophysics; Physique; chimie; mathématiques & sciences de la terre; Aérospatiale; astronomie & astrophysique; Antarc*; Antarctic; Antarctica
• Online Access: https://orbi.uliege.be/handle/2268/85065; https://orbi.uliege.be/bitstream/2268/85065/1/Exozodis.pdf; https://doi.org/10.1117/12.790298

The possible presence of large amounts of exozodiacal dust around nearby main sequence stars represents a threat to the detection and characterisation of Earth-like extrasolar planets with future infrared space interferometers such as DARWIN or TPF. In this paper, we first review the current detection capabilities of ground-based infrared interferometers such as CHARA/FLUOR and the detections of hot dust that have been obtained so far around a few main sequence stars. With the help of realistic instrumental simulations, we then discuss the relative merits of various ground-based sites (temperate and Antarctic) versus space-based observatories for the detection of exozodiacal discs down to a few zodi by interferometric nulling as a preparation to future life-finding missions. In particular, we discuss the performance of four proposed nulling interferometers: GENIE, ALADDIN, PEGASE and FKSI. An optimised strategy for the characterisation of candidate DARWIN/TPF targets is finally proposed.