Jean-Jacques Correia
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View article: Wavefront sensing with a gradient phase filter
Wavefront sensing with a gradient phase filter Open
View article: Wavefront sensing with a Gradient Phase Filter
Wavefront sensing with a Gradient Phase Filter Open
Wavefront sensors have now become core components in the fields of metrology of optical systems, biomedical optics, and adaptive optics systems for astronomy. However, none of the designs used or proposed so far achieve simultaneously a hi…
View article: Implementing the crossed-sine wavefront sensor for astronomy application with a single natural guide star
Implementing the crossed-sine wavefront sensor for astronomy application with a single natural guide star Open
The Crossed-sine Wavefront sensor (CS-WFS) is based on a gradient transmission filter and a 2 x 2 mini-lens array, enabling simultaneous achromatic imaging at a high spatial resolution and measurement accuracy comparable to those of laser-…
View article: Design and challenges for the HARMONI Laser Guide Star Sensors
Design and challenges for the HARMONI Laser Guide Star Sensors Open
HARMONI is the first light visible and near-IR integral field spectrograph for the ELT. It covers a large spectral range from 450nm to 2450nm with resolving powers from 3500 to 18000 and spatial sampling from 60mas to 4mas. It can operate …
View article: The crossed-sine wavefront sensor: first tests and results
The crossed-sine wavefront sensor: first tests and results Open
The crossed-sine wavefront sensor (WFS) is a pupil plane wavefront sensor that measures the first derivatives of the wavefront. It is made by three main components: a gradient transmission filter (GTF) built from a product of sine function…
View article: HARMONI at ELT: overview of the capabilities and expected performance of the ELT's first light, adaptive optics assisted integral field spectrograph.
HARMONI at ELT: overview of the capabilities and expected performance of the ELT's first light, adaptive optics assisted integral field spectrograph. Open
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View article: On-sky demonstration at Palomar Observatory of the near-IR, high-resolution VIPA spectrometer
On-sky demonstration at Palomar Observatory of the near-IR, high-resolution VIPA spectrometer Open
A near-IR high-resolution, R=80000 spectrometer has been developed at IPAG to\ndirectly characterize the atmosphere of exoplanets using adaptive optics (AO)\nassisted telescopes, and a single-mode fiber-injection unit. A first technical\nt…
View article: HARMONI at ELT: designing a laser guide star wavefront sensors for the ELT
HARMONI at ELT: designing a laser guide star wavefront sensors for the ELT Open
HARMONI is the first light visible and near-IR integral field spectrograph for the ELT covering a large spectral range from 450nm to 2450nm with resolving powers from 3500 to 18000 and spatial sampling from 60mas to 4mas. It can operate in…
View article: The crossed-sine wavefront sensor: first tests and results
The crossed-sine wavefront sensor: first tests and results Open
The crossed-sine wavefront sensor (WFS) is a pupil plane wavefront sensor\nthat measures the first derivatives of the wavefront. It is made by three main\ncomponents: a gradient transmission filter (GTF) built from a product of sine\nfunct…
View article: AMICal Sat: A sparse RGB imager on board a 2U cubesat to study the aurora
AMICal Sat: A sparse RGB imager on board a 2U cubesat to study the aurora Open
AMICal sat, a dedicated 2U cubesat, has been developed, in order to monitor the auroral emissions, with a dedicated imager. It aims to help to reconstruct the low energy electrons fluxes up to 30 keV in Earth auroral regions. It includes a…
View article: TOI-269 b: an eccentric sub-Neptune transiting a M2 dwarf revisited with ExTrA
TOI-269 b: an eccentric sub-Neptune transiting a M2 dwarf revisited with ExTrA Open
We present the confirmation of a new sub-Neptune close to the transition between super-Earths and sub-Neptunes transiting the M2 dwarf TOI-269 (TIC 220 479 565, V = 14.4 mag, J = 10.9 mag, R⋆ = 0.40 R⊙, M⋆ = 0.39 M⊙, d = 57 pc). The exopla…
View article: Experimental test of a 40 cm-long R=100 000 spectrometer for exoplanet characterisation
Experimental test of a 40 cm-long R=100 000 spectrometer for exoplanet characterisation Open
High-resolution spectroscopy is a key element for present and future\nastronomical instrumentation. In particular, coupled to high contrast imagers\nand coronagraphs, high spectral resolution enables higher contrast and has been\nidentifie…
View article: Electrical Properties of Tholins and Derived Constraints on the Huygens Landing Site Composition at the Surface of Titan
Electrical Properties of Tholins and Derived Constraints on the Huygens Landing Site Composition at the Surface of Titan Open
In 2005, the complex permittivity of the surface of Saturn's moon Titan was measured by the PWA‐MIP/HASI (Permittivity Wave Altimetry‐Mutual Impedance Probe/Huygens Atmospheric Structure Instrument) experiment on board the Huygens probe. T…
View article: Probing the hermean exosphere by ultraviolet spectroscopy (PHEBUS): optical simulation of an ultraviolet spectrometer
Probing the hermean exosphere by ultraviolet spectroscopy (PHEBUS): optical simulation of an ultraviolet spectrometer Open
PHEBUS (Probing of Hermean Exosphere by Ultraviolet Spectroscopy) consists of an ultraviolet spectrometer for the MPO (Mercury Planetary Orbiter) of the Bepi-Colombo Mission. The goal of this instrument is to detect emission lines of Mercu…