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Proceedings Paper

Direct imaging of Earth-like planets: why we care about exozodis
Author(s): O. Absil; D. Defrère; A. Roberge; J.-C. Augereau; V. Coudé du Foresto; C. Hanot; C. Stark; J. Surdej
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Paper Abstract

The presence of large amounts of exozodiacal dust around nearby main sequence stars is considered as a potential threat for the direct detection of Earth-like exoplanets (exoEarths) with future space-based coronagraphic and interferometric missions. In this paper, we estimate the amount of exozodiacal light that can be tolerated around various stellar types without jeopardizing the detection of exoEarths with a space-based visible coronagraph or a free-flying mid-infrared interferometer. We also address the possible effects of resonant structures in exozodiacal disks. We then review the sensitivity of current ground-based interferometric instruments to exozodiacal disks, based on classical visibility measurements and on the nulling technique. We show that the current instrumental performances are not sufficient to help prepare future exoEarth imaging missions, and discuss how new groundor space-based instruments could improve the current sensitivity to exozodiacal disks down to a suitable level.

Paper Details

Date Published: 21 July 2010
PDF: 10 pages
Proc. SPIE 7734, Optical and Infrared Interferometry II, 77340L (21 July 2010);
Show Author Affiliations
O. Absil, Univ. de Liège (Belgium)
D. Defrère, Max-Planck-Institut fur Radioastronomie (Belgium)
A. Roberge, NASA Goddard Space Flight Ctr. (United States)
J.-C. Augereau, Lab. d'Astrophysique de Grenoble, CNRS, Univ. Joseph Fourier (France)
V. Coudé du Foresto, LESIA, CNRS, Observatoire de Paris à Meudon (France)
C. Hanot, Univ. de Liège (Belgium)
C. Stark, Univ. of Maryland, College Park (United States)
J. Surdej, Univ. de Liège (Belgium)

Published in SPIE Proceedings Vol. 7734:
Optical and Infrared Interferometry II
William C. Danchi; Françoise Delplancke; Jayadev K. Rajagopal, Editor(s)

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