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| A. J. Lecavelier des Etangs | |
|---|---|
| Name | A. J. Lecavelier des Etangs |
| Nationality | French |
| Fields | Astrophysics; Exoplanetary science; Planetary atmospheres |
| Workplaces | Institut d'Astrophysique de Paris; CNRS; Observatoire de Paris |
| Alma mater | Université Paris-Sud; Université Paris-Saclay |
| Known for | Detection of exoplanetary atmospheres; discoveries of evaporating exoplanets |
A. J. Lecavelier des Etangs is a French astronomer and astrophysicist noted for pioneering observations of extrasolar planetary atmospheres, particularly studies of atmospheric escape and evaporation in close-in exoplanets and transiting systems. He has worked at major French institutions and collaborated with researchers across observatories and space agencies on observational campaigns using ground-based telescopes and space missions. His work intersects with developments in exoplanet detection, ultraviolet spectroscopy, and theoretical models of star–planet interactions.
Born in France, Lecavelier des Etangs completed advanced studies in physics and astronomy at institutions in the Paris region, including Université Paris-Sud and affiliated research schools linked to CNRS and Observatoire de Paris. During his doctoral training he interacted with researchers involved in projects connected to ESA, NASA, and national facilities such as the Haute-Provence Observatory and the European Southern Observatory, while following advances from missions like Hubble Space Telescope and XMM-Newton. His formative mentors and collaborators included faculty associated with Institut d'Astrophysique de Paris and laboratories engaged with Strasbourg and Marseille research networks.
Lecavelier des Etangs's career spans roles at CNRS laboratories, the Observatoire de Paris, and international collaborations involving ESA and NASA mission teams; he has participated in campaigns utilizing Hubble Space Telescope, Chandra X-ray Observatory, and ground-based facilities such as the Very Large Telescope and the Canada–France–Hawaii Telescope. His observational programs employed ultraviolet and optical spectroscopy techniques applied to transiting exoplanets discovered by projects including SuperWASP, Kepler, and CoRoT, and he has engaged with theoreticians working on stellar wind models, planetary Roche lobe overflow, and hydrodynamic escape influenced by stellar irradiation from stars like HD 209458 and HD 189733. He has served on committees and review panels associated with CNES and participated in conferences organized by International Astronomical Union and American Astronomical Society sessions on exoplanets and planetary atmospheres.
Lecavelier des Etangs led or co-authored landmark studies providing evidence for atmospheric escape from hot Jupiters and evaporating close-in planets, applying ultraviolet transit spectroscopy to detect extended hydrogen exospheres in systems such as HD 209458b and GJ 436b while linking signatures to stellar EUV and X-ray irradiation measured by Hubble Space Telescope and XMM-Newton. He contributed to the identification of "evaporating" rocky and gaseous planets in short-period orbits, relating observations to theoretical frameworks from research groups working on photoevaporation, tidal interactions, and magnetospheric coupling developed by teams affiliated with University of Cambridge, Harvard–Smithsonian Center for Astrophysics, and Institut d'Astrophysique de Paris. His analyses helped interpret anomalous transit depths and asymmetric light curves observed by Kepler and TESS teams and informed population-level inferences about the radius valley originally explored by investigators at California Institute of Technology, MIT, and University of Geneva. Lecavelier des Etangs also advanced techniques for constraining exospheric composition and dynamics, collaborating with spectroscopists from Max Planck Institute for Astronomy, University of Colorado, and Laboratoire d'Astrophysique de Marseille.
He has received recognition from French national research organizations and participated in award-winning collaborative discoveries reported in journals read by communities at American Astronomical Society, Royal Astronomical Society, and European Southern Observatory symposia. His work has been highlighted in conference proceedings of the International Astronomical Union and cited in review articles associated with exoplanet programs at NASA, ESA, and CNRS centers.
- Lecavelier des Etangs, A.; coauthors — Observational studies of hydrogen escape in transiting exoplanets reported in journals frequented by researchers at Hubble Space Telescope, XMM-Newton, and Chandra collaborations. - Lecavelier des Etangs, A.; coauthors — Analyses of evaporating rocky and gaseous planets connecting results to Kepler, CoRoT, and TESS exoplanet catalogs and theoretical models from University of Cambridge and Harvard groups. - Lecavelier des Etangs, A.; coauthors — Reviews synthesizing ultraviolet transit spectroscopy methods utilized by teams at ESA, NASA, and major observatories including VLT and CFHT.
Category:French astronomers Category:Exoplanet researchers