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20 papers · 1 filter
Exoplanet Imaging with a Phase-induced Amplitude Apodization Coronagraph III. Hybrid Approach: Optical Design and Diffraction Analysis
E. A. Pluzhnik, O. Guyon, S. T. Ridgway +4
Properly apodized pupils can deliver point spread functions (PSFs) free of Airy rings, and are suitable for high dynamical range imaging of extrasolar terrestrial planets (ETPs). T…
A Massive Planet to the Young Disc Star HD 81040
A. Sozzetti, S. Udry, S. Zucker +9
We report the discovery of a massive planetary companion orbiting the young disc star HD 81040. Based on five years of precise radial-velocity measurements with the HIRES and ELODI…
Near-UV to near-IR disk-averaged Earth's reflectance spectra
S. Hamdani, L. Arnold, C. Foellmi +5
We report 320 to 1020nm disk-averaged Earth reflectance spectra obtained from Moon's Earthshine observations with the EMMI spectrograph on the NTT at ESO La Silla (Chile). The spec…
Detectability of planetary rings around an extrasolar planet from reflected-light photometry
L. Arnold, J. Schneider
The next generation of high-contrast imaging instruments will provide the first unresolved image of an extrasolar planet. While the emitted infrared light from the planet in therma…
Near-UV to near-IR disk-averaged Earth's spectra from Moon's Earthshine observations
S. Hamdani, L. Arnold, C. Foellmi +5
We discuss a series of Earthshine spectra obtained with the NTT/EMMI instrument between 320nm and 1020nm with a resolution of R~450 in the blue and R~250 in the red. These ascendin…
The HARPS search for southern extra-solar planets V. A 14 Earth-masses planet orbiting HD 4308
S. Udry, M. Mayor, W. Benz +7
We present here the discovery and characterisation of a very light planet around HD4308. The planet orbits its star in 15.56 days. The circular radial-velocity variation presents a…