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PEGASE: a DARWIN/TPF pathfinder

  • M. Ollivier (a1), J.-M. Le Duigou (a2), D. Mourard (a3), O. Absil (a4), F. Cassaing (a5), E. Herwats (a4), L. Escarrat (a5), B. Chazelas (a1), F. Allard (a6), R. Clédassou (a2), V. Coudé du Foresto (a7), M. Delpech (a2), P. Duchon (a2), P.-Y. Guidotti (a2), A. Léger (a1), X. Leyre (a8), F. Malbet (a9), D. Rouan (a7) and S. Udry (a10)...

The space mission PEGASE, proposed to the CNES (Centre National d'Etudes Spatiales = French Space Agency) in the framework of its call for scientific proposals : “formation flying missions”, is a 2-aperture interferometer, composed by 3 free flying satellites (2 siderostats and 1 beam combiner), allowing baselines from 50 to 500 m in both nulling and visibility modes. With an angular resolution of a few mas and a spectral resolution of several tens in the spectral range 2.5-5 microns, PEGASE has several goals:

science : spectroscopy of hot jupiters (Pegasides) and brown dwarves, exploration of the inner part of protoplanetary disks

technology : validation in real space conditions of formation flying, nulling and visibility interferometry concepts.

PEGASE has been studied at a 0-level. In this paper, we summarize the scientific program and associated technological and mission trade-off coming from this 0-level study. We also discuss how PEGASE can be considered as a TPF/DARWIN pathfinder in an international roadmap towards more complex space interferometry missions such as DARWIN/TPF.

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Proceedings of the International Astronomical Union
  • ISSN: 1743-9213
  • EISSN: 1743-9221
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
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