# Lettre de l'AT Exosystèmes n°033 (15 septembre 2026)
Chères et chers collègues,
Voici les nouvelles de l’AT Exosystèmes du 2026-09-15 :
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1. Webinaire: Scientific and Technological Synergies for ANDES - September 22nd 2026 - 14h30 CEST
2. Survey of European Community Requirements for the Nancy Grace Roman Space Telescope
3. Soutenance de thèse de Paul Huet - 29 septembre 10h - Accrétion tardive de gaz issu de disques de débris.
4. Soutenance de thèse de Nishil Mehta - jeudi 24 septembre à 14h00 - "Étude de la circulation atmosphérique et des nuages pour la diversité des atmosphères d'exoplanètes à l'ère du JWST"
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1. Webinaire: Scientific and Technological Synergies for ANDES: The French Collaboration - September 22nd 2026 - 14h30 CEST - Isabelle Boisse (LAM) & Andrea Chiavassa (OCA)
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We are pleased to announce that the third webinar of the ELT-France Webinar Series will take place online on September 22nd, 2026 at 14:30 (CEST). The webinar will present the latest news on the ANDES spectrograph for the ELT and will be given by Isabelle Boisse (LAM) and Andrea Chiavassa (OCA).
Abstract:
ANDES (ArmazoNes high Dispersion Echelle Spectrograph) is the second-generation high-resolution spectrograph for the ELT. This versatile instrument will provide simultaneous spectral coverage from 0.35 to 2.4 μm at a resolving power of R = 100,000 in seeing-limited mode, complemented by an IFU-SCAO mode and a coronagraphic mode.
ANDES will address a number of major scientific questions, including the characterization of the atmospheres of rocky exoplanets through transmission and reflected-light spectroscopy, as well as measurements of the fundamental constants of physics. Its scientific applications span a broad range of topics, including the characterization of cool stars, the study of protoplanetary disks, the search for low-mass black holes, measurements of deuterium abundances, and constraints on variations in the temperature of the Cosmic Microwave Background.
We will present the instrument and its Consortium, its observing modes and capabilities, its main scientific priorities, and the current development timeline. We will also highlight the French scientific and technical contributions to ANDES, together with the initiatives being implemented to build and structure a strong national collaboration in preparation for the next stages of the instrument’s development.
To join the session, simply click on the link below or copy and paste the address into your web browser:
https://visio.numerique.gouv.fr/ihm-kwey-gxn
Transmis par Andrea Chiavassa et Isabelle Boisse
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2. Survey of European Community Requirements for the Nancy Grace Roman Space Telescope
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From Bethan James, ESA's Roman Project Scientist:
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Following the successful launch of the Nancy Grace Roman Space Telescope on 30 August, ESA is currently conducting a survey to better understand how the European scientific community plans to use data from Roman and what level of data access, archive functionality, and computing resources may be required to support future scientific exploitation.
As ESA's Roman Project Scientist, I am leading this effort together with the team of ESA-appointed scientists for Roman. The information collected will provide an important evidence base for understanding the scientific and technical requirements of the European Roman community. It will help inform future discussions within ESA on how best to support Roman science in Europe, including the potential value of enabling co-analysis of Roman data with ESA mission data such as Euclid, Gaia, and PLATO, where appropriate. The questionnaire is intended to capture community requirements and should not be interpreted as a commitment to any particular implementation.
We would be very grateful if you could complete the survey within the next two weeks. Please answer as many questions as possible. Even if your science plans are still evolving, partial responses are extremely valuable. You can find the survey here: https://forms.cloud.microsoft/Pages/ResponsePage.aspx?id=0Kxcmu8r102sXH6-H1T0la2R88d6XVlPoob6tC6lPuFUODZOUUdCNktXTlRRSzRVUVlMMFBJNllXRS4u
To provide context, we have placed a short overview of the Roman mission, its surveys, expected data products, and analysis environment at this link : https://esait-my.sharepoint.com/:b:/g/personal/bethan_james_esa_int/IQBnpr3fBJ57QLdEQQDrSxYkAb13_A0o1v5p46Qg9wtjcGM?e=aCcwWf. You do not need to be a Roman expert to complete the questionnaire and it should take ~10 minutes to complete.
All responses will be treated confidentially and will be used solely to help define the scientific and technical requirements for European support of Roman.
If you would prefer to discuss your science plans rather than complete the survey independently, members of the ESA Roman team would be happy to arrange a short meeting or interview. We are also happy to answer any questions you may have about the Roman mission, the questionnaire, or the purpose of this exercise.
We would also be grateful if you could share this survey with colleagues, students, or research groups who may be interested in using Roman data but may not have received this invitation directly.
Thank you for taking the time to contribute. Your input will help us build a clearer picture of the needs of the European Roman community and support future planning within ESA.
Transmis par Gaël Chauvin
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3. Soutenance de thèse de Paul Huet - 29 septembre 10h - Accrétion tardive de gaz issu de disques de débris.
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La soutenance aura lieu le mardi 29 septembre à 10h à l'amphithéatre Evry Schatzman du campus de Meudon de l'Observatoire de Paris et sera retrensmise en direct (puis en différé) sur la chaine youtube du LIRA https://www.youtube.com/@lira-observatoiredeparis.
Cette thèse, dirigée par Quentin Kral au LIRA, porte sur l'accrétion tardive de gaz issus de disques de débris. Pour plus d'informations : https://lira.observatoiredeparis.psl.eu/Soutenance-de-these-de-Paul-Huet-mardi-29-septembre-2026
Transmis par Paul Huet
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4. Soutenance de thèse de Nishil Mehta - jeudi 24 septembre à 14h00 - "Étude de la circulation atmosphérique et des nuages pour la diversité des atmosphères d'exoplanètes à l'ère du JWST"
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J'ai le plaisir de vous inviter à ma soutenance de thèse de doctorat, qui aura lieu le jeudi 24 septembre à 14h00 au Grand Méridien, à l’Observatoire de la Cote d’Azur, Nice.
Le titre de ma thèse est "Étude de la circulation atmosphérique et des nuages pour la diversité des atmosphères d'exoplanètes à l'ère du JWST", sous la direction de Vivien Parmentier et Tristan Guillot. Vous trouverez le résumé de la thèse ci-dessous.
Le jury de ma soutenance de thèse est composé de :
David Sing, Johns Hopkins University (remote)
François Forget, Laboratoire de Météorologie Dynamique, Paris, France
Anjali A. A. Piette, University of Birmingham
Jayesh Goyal, National Institute of Science Education & Research (NISER), Bhubaneswar, Odisha, Inde (remote)
Orlagh Creevey, Observatoire de la Côte d'Azur
La soutenance sera également diffusée en ligne. Merci de contacter Vivient Parmentier (vivien.parmentier@oca.eu) pour obtenir le lien.
Transmis par Nishil Mehta
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