A5070937925- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Atmospheric Ozone and Climate
- COVID-19 diagnosis using AI
- Radiomics and Machine Learning in Medical Imaging
- Lung Cancer Diagnosis and Treatment
- Spectroscopy and Laser Applications
- Healthcare Systems and Challenges
- Hydrocarbon exploration and reservoir analysis
- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Clinical Nutrition and Gastroenterology
- Atmospheric and Environmental Gas Dynamics
- Marine and coastal ecosystems
- CCD and CMOS Imaging Sensors
- Advanced Chemical Physics Studies
- Chemical Thermodynamics and Molecular Structure
Laboratoire d'Astrophysique de Bordeaux
2017-2024
Université de Bordeaux
2017-2024
Centre National de la Recherche Scientifique
2017-2024
Sorbonne Université
2024
Institut Pierre-Simon Laplace
2024
Université Paris-Saclay
2024
Laboratoire atmosphères, milieux, observations spatiales
2024
Université de Versailles Saint-Quentin-en-Yvelines
2024
University of Geneva
2023-2024
Sulphur-bearing species are often used to probe the physical structure of star forming regions interstellar medium, but chemistry sulphur in these is still poorly understood.In dark clouds, supposed be depleted under a form which unknown despite numerous observations and chemical modeling studies that have been performed.In order improve chemistry, we propose an enhancement network using experimental theoretical literature.We test effect updated on outputs three phases gas-grain model for...
We analyse the transmission and emission spectra of ultra-hot Jupiter WASP-76b, observed with G141 grism Hubble Space Telescope's Wide Field Camera 3 (WFC3). reduce fit raw data for each observation using open-source software Iraclis before performing a fully Bayesian retrieval publicly available analysis suite TauRex 3. Previous studies WFC3 WASP-76 b found hints titanium oxide (TiO) vanadium (VO) or non-grey clouds. Accounting fainter stellar companion to WASP-76, we reanalyse this show...
Abstract This paper presents the atmospheric characterization of three large, gaseous planets: WASP-127 b, WASP-79 and WASP-62 b. We analyzed spectroscopic data obtained with G141 grism (1.088–1.68 μ m) Wide Field Camera 3 on board Hubble Space Telescope using Iraclis pipeline TauREx3 retrieval code, both which are publicly available. For is least dense planet discovered so far located in short-period Neptune desert, our results found strong water absorption corresponding to an abundance...
The metastable helium triplet in the near-infrared (10833{\AA}) is among most important probes of exoplanet atmospheres. It can trace their extended outer layers and constrain mass-loss. We use high-resolution spectropolarimeter SPIRou on CFHT to search for spectrally resolved atmospheres eleven exoplanets, ranging from warm mini-Neptunes hot Jupiters orbiting G, K, M dwarfs. Observations were obtained as part Legacy Survey complementary open-time programs. apply a homogeneous data reduction...
Context . The population of close-in exoplanets features a desert hot Neptunes whose origin remains uncertain. These planets may have lost their atmosphere, eroding into mini-Neptunes and rocky super-Earths below the desert. Direct observations evaporating atmospheres are essential to derive mass-loss estimates constrain this scenario. metastable He I triplet at 1083.3 nm represents powerful diagnostic atmospheric evaporation because it traces gas in extended exoplanet while being observed...
We present an atmospheric characterization study of two medium sized planets bracketing the radius Neptune: HD 106315 c (R$_{\rm{P}}$=4.98 $\pm$ 0.23 R$_{\oplus}$) and 3167 (R$_{\rm{P}}$=2.740$_{-0.100}^{+0.106}$ R$_{\oplus}$). analyse spatially scanned spectroscopic observations obtained with G141 grism (1.125 - 1.650 $\mu$m) Wide Field Camera 3 (WFC3) onboard Hubble Space Telescope. use publicly available Iraclis pipeline TauREx3 retrieval code we detect water vapor in atmosphere both...
Abstract. From the Archean toward Proterozoic, Earth's atmosphere underwent a major shift from anoxic to oxic conditions at around 2.4 2.1 Ga known as Great Oxidation Event (GOE). This rapid transition may be related an atmospheric instability caused by formation of ozone layer. Previous works were all based on 1D photochemical models. Here, we revisit GOE with 3D photochemical–climate model investigate possible impact circulation and coupling between climate dynamics oxidation. We show that...
Observed exoplanet transit spectra are usually retrieved using 1D models to determine atmospheric composition. However, planetary atmospheres 3D. With the new state-of-the-art James Webb Space Telescope (JWST) and future space telescopes such as Ariel (Atmospheric Remote-sensing Infrared Exoplanet Large-survey), we will be able obtain increasingly accurate spectra. The 3D effects on visible, can expect biases in extractions. In order elucidate these biases, have built theoretical...
Abstract We present the analysis of hot-Jupiter KELT-7 b using transmission and emission spectroscopy from Hubble Space Telescope, both taken with Wide Field Camera 3. Our study uncovers a rich spectrum that is consistent cloud-free atmosphere suggests presence H 2 O − . In contrast, extracted does not contain strong absorption features and, although it simple blackbody, can be explained by varying temperature–pressure profile, collision induced absorption, had also been studied other...
Observed exoplanet transit spectra are usually retrieved using 1D models to determine atmospheric composition while planetary atmospheres 3D. With the JWST and future space telescopes such as Ariel, we will be able obtain increasingly accurate spectra. The 3D effects on visible, can expect biases in extractions. In order elucidate these biases, have built theoretical observations of spectra, from modeling through instrument modeling. observed strongly nonlinear coldest hottest planets. These...
The population of close-in exoplanets features a desert hot Neptunes whose origin is uncertain. These planets may have lost their atmosphere, eroding into mini-Neptunes and super-Earths. Direct observations evaporating atmospheres are essential to derive mass-loss estimates constrain this scenario. metastable 1083.3nm HeI triplet represents powerful diagnostic atmospheric evaporation since it traces the gas in extended exoplanet atmospheres, observable from ground, weakly affected by...
Abstract. From the Archean toward Proterozoic, Earth's atmosphere underwent a major shift from anoxic to oxic conditions, around 2.4 2.1 Gyr, known as Great Oxidation Event (GOE). This rapid transition may be related an atmospheric instability caused by formation of ozone layer. Previous works were all based on 1D photochemical models. Here, we revisit GOE with 3D photochemical-climate model investigate possible impact circulation and coupling between climate dynamics oxidation. We show that...