Institut de Planétologie et d&#x27;Astrophysique de Grenoble

Early Exploration of the Scientific Discovery Space for the Habitable Worlds Observatory

Courtney D. Dressing, Danica Adams, Evelyne Alecian +324

The Habitable Worlds Observatory (HWO) is a future NASA flagship mission concept identified by the Astro2020 Decadal Survey as the highest priority for large space missions. HWO sh…

Proof of concept of heterodyne interferometry at 10.6 um using photonic correlation

Tituan Allain, Jean-Philippe Berger, Guillaume Bourdarot +2

The task of imaging complex dust environments such as the inner astronomical units of a planet-forming disks requires dedicated mid-infrared (MIR) interferometric facilities with k…

The MICADO first light imager for the ELT: the SCAO module AIT in France, from the beta flat configuration towards the flat and final configurations

Yann Clénet, Vincent Lapeyrère, Eric Gendron +45

MICADO is the designated ELT first light instrument, a near-infrared imager working at the diffraction limit of the telescope thanks to a SCAO and an MCAO mode. Since summer 2024,…

Enhanced detection limits in the SHINE F150 survey through the Regime Switching Model. Optimizing thresholds and investigating environmental noise

Mariam Sabalbal, Olivier Absil, Carl-Henrik Dahlqvist +1

In high-contrast imaging, a novel detection algorithm for angular differential imaging (ADI) sequences has recently been introduced: the Regime Switching Model (RSM). In this study…

Optical gains measurement with a gain scheduling camera: On-sky demonstration with PAPYRUS and perspectives

A. Striffling, C. -T. Héritier, R. J. -L Fétick +4

Reaching the high angular resolution and contrast level desired for exoplanetary science requires us to equip large telescopes with extreme adaptive optics (XAO) systems to compens…

A socio-demographic study of the exoplanet direct imaging community II

Lucie Leboulleux, Niyati Desai, Daniel Echeverri +9

Recognizing and addressing under-representation, exclusion, and problematic behavior within astronomy and astrophysics is crucial. In 2019, a survey was conducted at the Spirit of…

Coherent Differential Imaging of high-contrast extended sources with VLT/SPHERE

Axel Potier, Raphaël Galicher, Pierre Baudoz +6

High-contrast imaging relies on advanced coronagraphs and adaptive optics (AO) to attenuate the starlight. However, residual aberrations, especially non-common path aberrations bet…

Stellar halo subtraction alternative for accreting companions' characterization with integral field spectroscopy: Analytical and on-sky demonstration on the PDS70, HTLup, and YSES1 systems

R. Julo, M. Bonnefoy, F. Chatelain +5

Context. Medium-resolution IFS, such as MUSE at the VLT, are equipped to detect the emission lines of faint accreting companions when associated with dedicated stellar halo subtrac…

astro-ph.IM2025★ 8 cited

First Light for the GRAVITY+ Adaptive Optics: Extreme Adaptive Optics for the Very Large Telescope Interferometer

GRAVITY+ Collaboration, :, F. Allouche +137

GRAVITY+ improves by orders of magnitude the sensitivity, sky-coverage and contrast of the Very Large Telescope Interferometer (VLTI). A central part of this project is the develop…

CONCERTO: forward modeling of interferograms for calibration

A. Lundgren, A. Beelen, G. Lagache +36

The CarbON [CII] line in post-rEionisation and ReionisaTiOn epoch (CONCERTO) instrument is a low-resolution mapping Fourier-transform spectrometer, based on lumped-element kinetic…

High-precision polarization measurements with Lumped Element Kinetic Inductance Detectors

Sofia Savorgnano, Andrea Catalano, Juan-Francisco Macías Perez +11

This work aims to demonstrate that two arrays of Lumped Element Kinetic Inductance Detectors (LEKIDs), when employed in filled array configuration and separated by an external line…

GRAVITY+ adaptive optics (GPAO) tests in Europe

Florentin Millour, Guillaume Bourdarot, Jean-Baptiste Le Bouquin +54

We present in this proceeding the results of the test phase of the GRAVITY+ adaptive optics. This extreme AO will enable both high-dynamic range observations of faint companions (i…

astro-ph.IM2025★ 106 cited

The Leinster-Cobbold diversity index as a criterion for sub-clustering

Hugo Chambon, Didier Fraix-Burnet

An automatic procedure to perform sub-clustering on large samples is presented. At each iteration, the most diverse cluster is sub-clustered, and the global diversity of the new cl…

astro-ph.IM2025★ 2 cited

Combining high-contrast imaging with high-resolution spectroscopy: Actual on-sky MIRI/MRS results compared to expectations

S. Martos, A. Bidot, A. Carlotti +1

CONTEXT: Combining high-contrast imaging with high-resolution spectroscopy offers a powerful way to detect and characterize exoplanets around nearby stars, despite challenges linke…

The NewAthena mission concept in the context of the next decade of X-ray astronomy

Mike Cruise, Matteo Guainazzi, James Aird +16

Large X-ray observatories such as Chandra and XMM-Newton have been delivering scientific breakthroughs in research fields as diverse as our Solar System, the astrophysics of stars,…

SF2A Environmental Transition Commission: Towards a desirable future for research in astronomy

Faustine Cantalloube, Camille Noûs

During its annual conference in 2024, the French Society of Astronomy & Astrophysics (SF2A) hosted a special session dedicated to discussing the environmental transition within the…

Experimental tests of the calibration of high precision differential astrometry for exoplanets

Manon Lizzana, Fabien Malbet, Pierre Kern +4

High precision differential Astrometry is the branch of astronomy that evaluates the relative position, distance and motion of celestial objects with respect to the stars present i…

astro-ph.IM2024★ 2 cited

Polarization effects on high contrast imaging: measurements on THD2 Bench

Pierre Baudoz, Celia Desgrange, Raphaël Galicher +1

The spectroscopic study of mature giant planets and low mass planets (Neptune-like, Earth-like) requires instruments capable of achieving very high contrasts ( $1 0^{- 10} - 1 0^{- 11}$ )…

Laboratory characterisation bench for high precision astrometry

Fabrice Pancher, Sebastien Soler, Fabien Malbet +4

High precision differential astrometry assesses the positions, distances, and motions of celestial objects in relation to the stars. The focal plane of such space telescope must be…

"My Earth" Astrophysics and Planets -- a serious game to build low carbon scenarios in the astronomy academic community

Fabien Malbet, Alexandre Santerne, Julien Milli +8

This report summarizes what has happened in the mini-workshops entitled ''My Earth in 180 minutes'' organized during the lunch break at the SF2A 2024 conference in Marseille. The p…

Simplified model(s) of the GRAVITY+ adaptive optics system(s) for performance prediction

Anthony Berdeu, Jean-Baptiste Le Bouquin, Guillaume Mella +13

In the context of the GRAVITY+ upgrade, the adaptive optics (AO) systems of the GRAVITY interferometer are undergoing a major lifting. The current CILAS deformable mirrors (DM, 90…