Journée annuelle de l'Axe Astrophysique de la Graduate School de Physique (UPSaclay) - Mardi 1er décembre 2026

Liste des Contributions

1. Presentation of Astro @ Paris-Saclay

Dr Frédéric GALLIANO (DAp, CEA Paris-Saclay, France)

01/12/2026 09:20

I will introduce this annual day by briefly reviewing what is the Astrophysical Axis of the Graduate School of physics. I will present our actions and the opportunities we offer.

2. Optical Systematics in CMB Spectral Distortion Instruments

Morgane LOQUET LE GALL (IAS)

01/12/2026 09:35

While CMB temperature anisotropies have been characterised with precision, the CMB frequency spectrum has not been remeasured since the FIRAS instrument aboard COBE in the early 1990s. FIRAS showed that the spectrum is extremely close to a blackbody, with deviations from a perfect Planck spectrum below ΔI/I ∼ 10⁻⁵. Such small departures, known as spectral distortions, encode the thermal and...

3. Dialogue between worlds

Maria LOVINO (IN2P3/IJCLab), Xavier BERTOU (IJCLab)

01/12/2026 09:55

We will present an interdisciplinary project that bridges astroparticle physics and fashion design.

Co-developed with Argentine fashion creator Panni Margot, “Dialogue Between Worlds” aims to explore new, impactful ways of communicating science and engaging society. The project establishes a partnership between fundamental astroparticle physics and creative design, transforming complex...

4. What does C₂H₂ trace in planet-forming regions of disks?

Pacôme ESTEVE (Institut d'Astrophysique Spatiale)

01/12/2026 11:00

Despite the tremendous number of exoplanets detected, planet-forming scenarios are not yet able to fully explain the large diversity of planets. They form and obtain their composition from gas and dust in protoplanetary disks. The elemental composition of disks is known to vary spatially due to physical (ex: pebble drift) and chemical (chemical reactions, sublimation) processes. Thus, the...

5. Zoom-in simulations from the kpc scale to star forming cores

Georges ABBOUDEH (AIM - CEA Saclay)

01/12/2026 11:20

Zoom-in simulations from the kpc scale to star forming cores
- Abstract: :: Star formation plays a crucial role in shaping its environment and drives the evolution of planets, the interstellar medium, galaxies, and the Universe as a whole. We investigate this process using numerical simulations that follow star-forming structures across a wide range of spatial scales.

We first simulate a...

6. Modelling the EUV coronagraphic observations of the Full Sun Imager on board Solar Orbiter

Ganushan GANESARATNAM (Institut d'Astrophysique Spatiale)

01/12/2026 11:40

Because of its mass and abundance, helium plays a fundamental role in the dynamics of the solar wind. The properties of helium are characterized in the photosphere with spectroscopic surveys and in the heliosphere with in-situ measurements. However, very few measurements of the helium abundance exist in the corona above 1.1Rs where the solar wind is accelerated. The EUI and Metis instruments...

7. Ultraminiaturized Gas Chromatograph Based on Lab-on-a-Chip Micro-electro Mechanical Systems for Space Exploration

Lylia SKANDER (LATMOS (Laboratoire ATMosphères et Observations Spatiales))

01/12/2026 12:00

Gas chromatography is a widely used analytical technique in space exploration for the separation and identification of organic compounds in complex samples. Space missions impose stringent constraints on onboard instrumentation, which must be as compact, lightweight, and low-power consuming as possible. In this context, ultra-miniaturized chromatographs based on lab-on-chip represent a...

8. Direct dark matter detection with Transition Edge Superconductors (TES) with single-electron sensitivity for the TESSERACT Collaboration

Alec COCHARD

01/12/2026 14:00

The nature of dark matter is one of the most important unsolved puzzles in fundamental physics, driving searches beyond the Standard Model. Current theories suggest that this matter primarily interacts via gravitation, but also weakly with ordinary matter. However, due to the very low interaction cross-sections, it is very hard to observe and detectors sensibilities need to be increased.
...

9. An Overview of the Ionic Composition and Energy Distribution measured by MSA during BepiColombo Swing-bys of Mercury

Sébastien VERKERCKE (LPP)

01/12/2026 14:20

Mercury is one of the two terrestrial planets in our Solar System possessing an intrinsic magnetic field. Being the closest planet to the Sun and having a weak magnetic field, the Hermean magnetic environment is rapidly changing and forms a tightly coupled system with the planet’s core and surface. Its closeness to the Sun causes Mercury’s surface to undergo extreme conditions, with continuous...

10. TBD

Clément PELLOUIN (CEA - AIM)

01/12/2026 14:40

11. Probing Cosmic Web Structures with Generative Models

Mehdi NOOR (Institut d'Astrophysique Spatiale)

01/12/2026 15:00

The cosmic web, consisting of an intricate network of voids, walls, filaments and clusters, contains key information about cosmological parameters and the evolution of large-scale structures in the universe. In this context, very large ensembles of cosmological simulations are required to analyse upcoming galaxy survey data. To circumvent the associated computational cost, we aim at...

12. TBD

Roland LEHOUCQ (CEA)

01/12/2026 15:50

Round table: Science communication and its new formats ― how can we counter misinformation and attacks on Science?

13. TBD

Séverine MARTRENCHARD (CNRS)

01/12/2026 16:00

Round table: Science communication and its new formats ― how can we counter misinformation and attacks on Science?