Reference : Pegase: a space-based nulling interferometer
Scientific congresses and symposiums : Paper published in a book
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
Pegase: a space-based nulling interferometer
Le Duigou, J. M. [Ctr. National d'Études Spatiale (France)]
Ollivier, M. [Institut d'Astrophysique Spatiale (France)]
Léger, A. [Institut d'Astrophysique Spatiale (France)]
Cassaing, F. [Office National d'Etudes et de Recherches Aéronautiques (France)]
Sorrente, B. [Office National d'Etudes et de Recherches Aéronautiques (France)]
Fleury, B. [Office National d'Etudes et de Recherches Aéronautiques (France)]
Rousset, G. [Office National d'Etudes et de Recherches Aéronautiques (France) and Observatoire de Paris (France)]
Absil, Olivier mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Mourard, D. [Observatoire de la Côte d'Azur (France)]
Rabbia, Y. [Observatoire de la Côte d'Azur (France)]
Escarrat, L. [Observatoire de la Côte d'Azur (France)]
Malbet, F. [Lab. d'Astrophysique de l'Observatoire de Grenoble (France)]
Rouan, D. [Observatoire de Paris (France)]
Clédassou, R. [Ctr. National d'Études Spatiale (France)]
Delpech, M. [Ctr. National d'Études Spatiale (France)]
Duchon, P. [Ctr. National d'Études Spatiale (France)]
Meyssignac, B. [Ctr. National d'Études Spatiale (France)]
Guidotti, P.-Y. [Ctr. National d'Études Spatiale (France)]
Gorius, N. [Ctr. National d'Études Spatiale (France)]
Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter
Mather, John C.
MacEwen, Howard A.
de Graauw, Mattheus W. M.
Proceedings of the SPIE, volume 6265
Astronomical Telescopes and Instrumentation 2006: Space Telescopes and Instrumentation I (Optical, Infrared, and Millimeter)
24/05/2006 - 31/05/2006
[en] Interferometry ; Nulling ; Formation flying ; Cophasing ; Spectroscopy ; Low mass objects ; Protoplanetary disks
[en] The space based mission Pegase was proposed to CNES in the framework of its call for scientific proposals for formation flying missions. This paper presents a summary of the phase-0 performed in 2005. The main scientific goal is the spectroscopy of hot Jupiters (Pegasides) and brown dwarfs from 2.5 to 5 mum. The mission can extend to other objectives such as the exploration of the inner part of protoplanetary disks, the study of dust clouds around AGN,... The instrument is basically a two-aperture (D=40 cm) interferometer composed of three satellites, two siderostats and one beam-combiner. The formation is linear and orbits around L2, pointing in the anti-solar direction within a +/-30° cone. The baseline is adjustable from 50 to 500 m in both nulling and visibility measurement modes. The angular resolution ranges from 1 to 20 mas and the spectral resolution is 60. In the nulling mode, a 2.5 nm rms stability of the optical path difference (OPD) and a pointing stability of 30 mas rms impose a two level control architecture. It combines control loops implemented at satellite level and control loops operating inside the payload using fine mechanisms. According to our preliminary study, this mission is feasible within an 8 to 9 years development plan using existing or slightly improved space components, but its cost requires international cooperation. Pegase could be a valuable Darwin/TPF-I pathfinder, with a less demanding, but still ambitious, technological challenge and a high associated scientific return.
Copyright 2006 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

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