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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…
The projection factor of delta Cephei A calibration of the Baade-Wesselink method using the CHARA Array
Mérand Antoine, Pierre Kervella, Vincent Coude Du Foresto +8
Cepheids play a key role in astronomy as standard candles for measuring intergalactic distances. Their distance is usually inferred from the Period-Luminosity relationship, calibra…
First Results from the CHARA Array. II. A Description of the Instrument
T. A. ten Brummelaar, H. A. McAlister, S. T. Ridgway +9
The CHARA Array is a six 1-m telescope optical/IR interferometric array located on Mount Wilson California, designed and built by the Center for High Angular Resolution Astronomy o…
Squared visibility estimator. Calibrating biases to reach very high dynamic range
G. Perrin, S. T. Ridgway
In the near infrared where detectors are limited by read-out noise, most interferometers have been operated in wide band in order to benefit from larger photon rates. We analyze in…
Study of molecular layers in the atmosphere of the supergiant star mu Cep by interferometry in the K band
G. Perrin, S. T. Ridgway, T. Verhoelst +5
Infrared interferometry of supergiant and Mira stars has recently been reinterpreted as revealing the presence of deep molecular layers. Empirical models for a photosphere surround…
Is Arcturus a well-understood K giant? Test of model atmospheres and potential companion detection by near-infrared interferometry
T. Verhoelst, P. J. Bordé, G. Perrin +8
We present near-IR interferometric measurements of the K1.5 giant Arcturus (alpha Bootis), obtained at the IOTA interferometer with the FLUOR instrument, in four narrow filters wit…