scholarly journals James Webb Space Telescope optical simulation testbed V: wide-field phase retrieval assessment

2018 ◽  
Author(s):  
Sylvain Egron ◽  
Mamadou N'Diaye ◽  
Iva Laginja ◽  
Gregory R. Brady ◽  
Rémi Soummer ◽  
...  
Keyword(s):  
Phase Retrieval ◽  
Optical Simulation ◽  
Wide Field ◽  
Field Phase ◽  
Space Telescope ◽  
James Webb Space Telescope

scholarly journals James Webb Space Telescope Optical Simulation Testbed II: design of a three-lens anastigmat telescope simulator

2014 ◽  
Author(s):  
Élodie Choquet ◽  
Olivier Levecq ◽  
Mamadou N'Diaye ◽  
Marshall D. Perrin ◽  
Rémi Soummer
Keyword(s):  
Optical Simulation ◽  
Space Telescope ◽  
James Webb Space Telescope

scholarly journals James Webb Space telescope optical simulation testbed: experimental results with linear control alignment

2017 ◽  
Author(s):  
Charles-Philippe Lajoie ◽  
Aurélie Bonnefois ◽  
Lucie Leboulleux ◽  
Laurent Pueyo ◽  
Marie Ygouf ◽  
...  
Keyword(s):  
Experimental Results ◽  
Linear Control ◽  
Optical Simulation ◽  
Space Telescope ◽  
James Webb Space Telescope

scholarly journals ARES V: No Evidence For Molecular Absorption in the HST WFC3 Spectrum of GJ 1132 b

2021 ◽  
Author(s):  
Lorenzo V. Mugnai ◽  
Darius Modirrousta-Galia ◽  
Billy Edwards ◽  
Keyword(s):  
Transmission Spectrum ◽  
Hubble Space Telescope ◽  
Wide Field ◽  
Transmission Spectra ◽  
Molecular Signatures ◽  
Molecular Absorption ◽  
Space Telescope ◽  
James Webb Space Telescope ◽  
Planetary Transmission ◽  
Best Fit

<p>We present a study on the spatially scanned spectroscopic observations of the transit of GJ 1132 b, a warm (~500 K) Super-Earth (1.13 Re) that was obtained with the G141 grism (1.125 - 1.650 micron) of the Wide Field Camera 3 (WFC3) onboard the Hubble Space Telescope. We used the publicly available Iraclis pipeline to extract the planetary transmission spectra from the five visits and produce a precise transmission spectrum. We analysed the spectrum using the TauREx3 atmospheric retrieval code with which we show that the measurements do not contain molecular signatures in the investigated wavelength range and are best-fit with a flat-line model. Our results suggest that the planet does not have a clear primordial, hydrogen-dominated atmosphere. Instead, GJ 1132 b could have a cloudy hydrogen-dominated envelope, a very enriched secondary atmosphere, be airless, or have a tenuous atmosphere that has not been detected. Due to the narrow wavelength coverage of WFC3, these scenarios cannot be distinguished yet but the James Webb Space Telescope may be capable of detecting atmospheric features, although several observations may be required to provide useful constraints</p>

scholarly journals On the detection of supermassive primordial stars – II. Blue supergiants

2019 ◽  
Vol 488 (3) ◽  
pp. 3995-4003 ◽  
Author(s):  
Marco Surace ◽  
Erik Zackrisson ◽  
Daniel J Whalen ◽  
Tilman Hartwig ◽  
S C O Glover ◽  
...  
Keyword(s):  
Gravitational Lensing ◽  
Near Infrared ◽  
Detection Limits ◽  
Wide Field ◽  
Spectral Features ◽  
Field Surveys ◽  
Space Telescope ◽  
Surface Temperatures ◽  
James Webb Space Telescope ◽  
The Universe

ABSTRACT Supermassive primordial stars in hot, atomically cooling haloes at z ∼ 15–20 may have given birth to the first quasars in the Universe. Most simulations of these rapidly accreting stars suggest that they are red, cool hypergiants, but more recent models indicate that some may have been bluer and hotter, with surface temperatures of 20 000–40 000 K. These stars have spectral features that are quite distinct from those of cooler stars and may have different detection limits in the near-infrared today. Here, we present spectra and AB magnitudes for hot, blue supermassive primordial stars calculated with the tlusty and cloudy codes. We find that photometric detections of these stars by the James Webb Space Telescope will be limited to z ≲ 10–12, lower redshifts than those at which red stars can be found, because of quenching by their accretion envelopes. With moderate gravitational lensing, Euclid and the Wide-Field Infrared Space Telescope could detect blue supermassive stars out to similar redshifts in wide-field surveys.

scholarly journals James Webb Space Telescope Optical Simulation Testbed I: overview and first results

2014 ◽  
Author(s):  
Marshall D. Perrin ◽  
Rémi Soummer ◽  
Élodie Choquet ◽  
Mamadou N'Diaye ◽  
Olivier Levecq ◽  
...  
Keyword(s):  
Optical Simulation ◽  
Space Telescope ◽  
James Webb Space Telescope ◽  
First Results

Demonstration of extended capture range for James Webb Space Telescope phase retrieval

2015 ◽  
Vol 54 (21) ◽  
pp. 6454 ◽  
Author(s):  
R. Elizabeth Carlisle ◽  
D. Scott Acton
Keyword(s):  
Phase Retrieval ◽  
Space Telescope ◽  
James Webb Space Telescope ◽  
Capture Range

Optical wavefront characterization using phase retrieval for the NIRSpec demonstration model for the James Webb Space Telescope

2010 ◽  
Author(s):  
Jeffrey S. Smith ◽  
David L. Aronstein ◽  
Pamela S. Davila ◽  
Bruce H. Dean ◽  
Bernhard Dorner ◽  
...  
Keyword(s):  
Phase Retrieval ◽  
Space Telescope ◽  
James Webb Space Telescope

Characterising the Hot Jupiters WASP-127\,b, WASP-79\,b and WASP-62\,b with HST

2020 ◽  
Author(s):  
Nour Skaf
Keyword(s):  
Hubble Space Telescope ◽  
Wide Field ◽  
Space Telescope ◽  
Hot Jupiters ◽  
James Webb Space Telescope ◽  
Cloudy Atmosphere ◽  
Iron Hydride ◽  
Short Period ◽  
And Migration ◽  
Best Fit

<p>We would like to present the atmospheric characterisation of three large, gaseous planets: WASP-127b, WASP-79b and WASP-62b. We analysed spectroscopic data obtained with the G141 grism (1.088 - 1.68 um) of the Wide Field Camera 3 (WFC3) onboard the Hubble Space Telescope (HST) using the Iraclis pipeline and the TauREx3 retrieval code, both of which are publicly available. For WASP-127b, which is the least dense planet discovered so far and is located in the short-period Neptune desert, our retrieval results found strong water absorption corresponding to an abundance of log(H$_2$O) = -2.71$^{+0.78}_{-1.05}$, and absorption compatible with an iron hydride abundance of log(FeH)=$-5.25^{+0.88}_{-1.10}$, with an extended cloudy atmosphere.<br />We also detected water vapour in the atmospheres of WASP-79b and WASP-62b, with best-fit models indicating the presence of iron hydride, too.<br />We used the Atmospheric Detectability Index (ADI) as well as Bayesian log evidence to quantify the strength of the detection and compared our results to the hot Jupiter population study by Tsiaras et al 2018.<br />While all the planets studied here are suitable targets for characterisation with upcoming facilities such as the James Webb Space Telescope (JWST) and Ariel, WASP-127b is of particular interest due to its low density, and a thorough atmospheric study would develop our understanding of planet formation and migration. </p>

James Webb Space Telescope optical simulation testbed III: first experimental results with linear-control alignment

2016 ◽  
Author(s):  
Sylvain Egron ◽  
Charles-Philippe Lajoie ◽  
Lucie Leboulleux ◽  
Mamadou N'Diaye ◽  
Laurent Pueyo ◽  
...  
Keyword(s):  
Experimental Results ◽  
Linear Control ◽  
Optical Simulation ◽  
Space Telescope ◽  
James Webb Space Telescope
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