Exoplanets and Stellar Physics

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SWIFT de-magnifying image slicer: Diffraction limited image slicing at optical wavelengths

Proceedings of SPIE - The International Society for Optical Engineering 7018 (2008)

Authors:

M Tecza, N Thatte, F Clarke, L Fogarty, T Goodsall, G Salter, D Freeman, Y Salaun

Abstract:

We present the manufacturing and first results from testing and characterising the SWIFT image slicer. The SWIFT image slicer design is based on the MPE-3D and SPIFFI image slicers. It uses plane mirrors to slice the input field but through a novel, de-magnifying design, using a mosaic of spherical lenses, it achieves a considerable de-magnification. Classical polishing techniques can be applied to manufacture both plane and spherical surfaces with very high surface accuracy and quality reducing aberrations and scattered light. The SWIFT image slicer was manufactured over a 18 months period and was delivered to Oxford in September 2007. The commissioning of the SWIFT instrument will take place in August/September 2008.
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Magnetic activity in the photosphere of CoRoT-Exo-2a. Active longitudes and short-term spot cycle in a young Sun-like star

(2008)

Authors:

AF Lanza, I Pagano, G Leto, S Messina, S Aigrain, R Alonso, M Auvergne, A Baglin, P Barge, AS Bonomo, P Boumier, A Collier Cameron, M Comparato, G Cutispoto, JR De Medeiros, B Foing, A Kaiser, C Moutou, PS Parihar, AVR Silva, WW Weiss
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The Monitor project: Rotation periods of low-mass stars in M50

(2008)

Authors:

Jonathan Irwin, Suzanne Aigrain, Jerome Bouvier, Leslie Hebb, Simon Hodgkin, Mike Irwin, Estelle Moraux
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Star-Planet Interactions

(2008)

Authors:

Evgenya Shkolnik, Suzanne Aigrain, Steven Cranmer, Rim Fares, Malcolm Fridlund, Frederic Pont, Juergen Schmitt, Alexis Smith, Takeru Suzuki
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Transiting exoplanets from the CoRoT space mission: V. CoRoT-Exo-4b: Stellar and planetary parameters

Astronomy and Astrophysics 488:2 (2008)

Authors:

C Moutou, H Bruntt, T Guillot, A Shporer, E Guenther, S Aigrain, JM Almenara, R Alonso, M Auvergne, A Baglin, M Barbieri, P Barge, W Benz, P Bordé, F Bouchy, HJ Deeg, R De La Reza, M Deleuil, R Dvorak, A Erikson, M Fridlund, M Gillon, P Gondoin, A Hatzes, G Hébrard, L Jorda, P Kabath, H Lammer, A Léger, A Llebaria, B Loeillet, P Magain, M Mayor, T Mazeh, M Ollivier, M Pätzold, F Pepe, F Pont, D Queloz, M Rabus, H Rauer, D Rouan, J Schneider, S Udry, G Wuchterl

Abstract:

Aims: The CoRoT satellite has announced its fourth transiting planet (Aigrain et al. 2008, A&A, 488, L43) with space photometry. We describe and analyse complementary observations of this system performed to establish the planetary nature of the transiting body and to estimate the fundamental parameters of the planet and its parent star. Methods: We have analysed high precision radial-velocity data, ground-based photometry, and high signal-to-noise ratio spectroscopy. Results: The parent star CoRoT-Exo-4 (2MASS 06484671-0040219) is a late F-type star of mass of 1.16 and radius of 1.17 . The planet has a circular orbit with a period of 9.20205 d. The planet radius is 1.19 and the mass is 0.72 . It is a gas-giant planet with a "normal" internal structure of mainly H and He. CoRoT-Exo-4b has the second longest period of the known transiting planets. It is an important discovery since it occupies an empty area in the mass-period diagram of transiting exoplanets.. © 2008 ESO.
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