S08

Astronomy with super-resolution: Overcoming the lambda/D limit

Communauté

Contact : lucie.leboulleux@univ-grenoble-alpes.fr

Main language for discussions / Langue principale des échanges oraux : ENGLISH

Pushing high-angular-resolution astronomy closer to, or even beyond, the classical diffraction limit defined by λ/D is one of the key frontiers for directly imaging and characterizing exoplanets at small angular separations. Achieving super-resolution is central for accessing regions around stars where terrestrial planets reside, and where traditional diffraction-limited instruments face fundamental limitations. This half-day workshop organized by the AS (Action Spécifique) HRA (Haute Résolution Angulaire) will bring together researchers working on a wide range of high-angular-resolution concepts. It will focus on both instrumental and algorithmic strategies enabling super-resolution, and aims to identify synergies across different techniques that have developed separately.

The first part of the workshop will review the latest advances toward super-resolution through a broad range of approaches: innovative instrumental concepts based on interferometric techniques (sparse aperture masking, pupil remapping, dual-field interferometry nulling interferometry), coronagraphic methods (small inner working angles coronagraph, dark zone control, wavefront control strategies), and advanced post-processing techniques (Reference-star differential imaging or RDI, Coherent Differential Imaging or CDI, statistical and machine-learning-based approaches, Kernel phases). For the second part of the workshop, participants will have the opportunity to discuss and compare methodologies, share lessons learned from laboratory and on-sky campaigns, and explore where synergies or hybrid strategies could provide new improvements. The objective here will be to identify how these diverse methods can complement one another, both conceptually and operationally.

The advances toward the smallest possible angular separations are essential for the direct detection and atmospheric characterization of terrestrial exoplanets, for future space missions such as HWO and LIFE, for the new generation of extremely large ground-based telescopes (ELT, GMT, TMT), and for the upcoming suite of interferometric instruments at the VLTI (GRAVITY+, MATISSE, ASGARD).

For this workshop, contributions from early-career scientists will be particularly encouraged and promoted.

SOC: Elodie Choquet, Jean-Baptiste Le Bouquin, Nick Cvetojevic, Olivier Flasseur, Lucie Leboulleux, Mamadou N’Diaye, Jean-François Sauvage

Programme des présentations orales

Horaire	Auteur	Titre	Abstract	Présentation (fichier)
14h00 – 14h05	Introduction
14h05 – 14h20	Lizzana, M., Malbet, F., Rousset, H., Soler, S., Pancher, F., Leger, A.	High-precision differential astrometry for discovering exoplanets	Fichier	Fichier
14h20 – 14h35	Sarrazin, J., Huby, E., Lacour, S., Vievard, S., Guyon, O., Nowak, M., Lallement, M., Kim, Y.J., Walk, A.	Photonic lanterns for image reconstruction with FIRST-PL, a demonstration with HIP81126.	Fichier	Fichier
14h35 – 14h50	J. Calderon-Gomez, F. Martinache, N. Cvetojevic, M.A. Martinod, V. Foriel, N. Jovanovic, P. Gatkine, A. Carlotti, M. Ferlet, M. Pasinetti, A. Alagao, A. Striffling, G. Martin	Characterization and on-sky testing of high-resolution photonic, AWG-based astronomical spectrographs.	Fichier	Fichier
14h50 – 15h05	G.Bourdarot and the exoGRAVITY Collab.	Super-resolution as tool for detecting young protoplanets: WISPIT-2, a new PDS70 system	Fichier	–
15h05 – 15h20	W. Guerin	Stellar interferometry at long baseline and short wavelength (but on bright objects): recent progress in intensity interferometry	Fichier	Fichier
15h20 – 15h35	A. Carlotti	Knowing your limits	Fichier	Fichier
15h35 – 15h40	Poster Pop Talk
15h40 – 16h15	Coffee Break
16h15 – 16h40	Berdeu, A., Soulez, F.	How blind deconvolution can push further the instrumental limits? Two examples with (I) asteroid imaging and moon detection, and (II) Betelgeuse’s surface recovery from its occultation by (319) Leona	Fichier	–
16h40 – 16h55	Lau, A., Choquet , É., Altinier, L., Pourcelot, R., Laginja, I., Soummer, R., Vigan, A.	High Order Dithering experimental validation: extending JWST small grid dithering strategies on Roman CGI	Fichier	Fichier
16h55 – 17h10	Sauvourel F., Cantalloube F.	Characterisation of the wind-driven halo in 10 years of VLT/SPHERE-IRDIS data	Fichier	Fichier
17h10 – 18h00	Discussion

Posters électroniques

Auteur	Titre	Abstract	Poster (fichier)
Elora Lefebvre, Marcel Carbillet, Olivier Lai, Lyu Abe, François-Xavier Schmider, Nhu Tin Mai, Julien Dejonghe, Jean-Pierre Rivet	Adaptive Optics at C2PU/Calern (AOC) : a stellar- and planetary-mode AO system on a 1-m telescope	Fichier	Fichier