For the detection and direct imaging of exoplanets, when the intensity ratio between a star and its orbiting planet can largely exceed 106, coronagraphic methods are mandatory. In 1996, a concept of achromatic interferocoronagraph (AIC) was presented by J. Gay and Y. Rabbia for the detection of very faint stellar companions, such as exoplanets....
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2010 (v1)Conference paperUploaded on: December 4, 2022
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August 1, 2020 (v1)Report
MATISSE est un instrument de 2nde génération du VLTI. C'est un instrument spectro-imageur couvrant les bandes L,M et N dans l'infrarouge moyen (de 3 à 13 µm). Ce rapport à l'ESO décrit le commissioning de MATISSE et présente l'ensemble de ses performances. Les performances contractuelles de MATISSE sont complétées par une première évaluation du...
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July 15, 2022 (v1)Report
MATISSE est l'instrument de seconde génération du VLTI dédié à la spectro-interférométrie dans l'infrarouge moyen, de 3 à 13 µm. Ce rapport à l'ESO décrit son commissioning, son optimisation et l'ensemble de ses performances telles qu'elles devraient être offertes aux utilisateurs de l'ESO. Cette version du rapport est la version finale pour...
Uploaded on: December 3, 2022 -
July 17, 2022 (v1)Conference paper
Hierarchical Fringe Tracking (HFT) is a fringe tracking concept optimizing the sensitivity in optical long baseline by reducing to an absolute minimum the number of measurements used to correct the OPD fluctuations. By nature, the performances of an HFT do not decreases with the number of apertures of the interferometer and are set only by the...
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November 17, 2021 (v1)Journal article
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November 17, 2021 (v1)Journal article
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December 14, 2020 (v1)Conference paper
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December 14, 2020 (v1)Conference paper
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December 14, 2020 (v1)Conference paper
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June 10, 2018 (v1)Conference paper
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December 14, 2020 (v1)Conference paper
CHARA/SPICA (Stellar Parameters and Images with a Cophased Array) is currently being developed at Observatoire de la Cote d'Azur. It will be installed at the visible focus of the CHARA Array by the end of 2021. It has been designed to perform a large survey of fundamental stellar parameters with, in the possible cases, a detailed imaging of the...
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July 18, 2022 (v1)Conference paper
We present the testbench aimed at integrating the GRAVITY+ adaptive optics GPAO. It consists of two independent elements, one reproducing the Coudé focus of the telescope, including the telescope deformable mirror mount (with its surface facing down), and one reproducing the Coudé room opto-mechanical environment, including a...
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August 2022 (v1)Journal article
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July 17, 2022 (v1)Conference paper
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September 27, 2023 (v1)Journal article
Abstract From Nov. 2019 to May 2020, the red supergiant star Betelgeuse experienced an unprecedented drop of brightness in the visible domain called the great dimming event. Large atmospheric dust clouds and large photospheric convective features are suspected to be responsible for it. To better understand the dimming event, we used...
Uploaded on: October 14, 2023