Elbereth conference 2025

Session

Session 11

11 avr. 2025, 14:30

Amphithéâtre Evry Schatzman (Observatoire de Paris - Site de Meudon)

103. The Epoch of Reionisation: From Theory to Data

Lilian Crascall-Kennedy (Institut d'Astrophysique Spatiale)

11/04/2025 14:30

Oral presentation

The Epoch of Reionisation marks the transition between the end of the cosmic dark ages and the beginning of the universe as we know it today. During this time the radiation from the first stars and galaxies ionised the neutral hydrogen around them, fundamentally transforming the universe. The EoR is one of the last major phases of cosmic evolution that remains mostly unexplored as no direct...

90. Inclined coorbitals in the three-body problem

Alexandre Prieur (LTE, Observatoire de Paris-PSL)

11/04/2025 14:45

Astrophysics

Oral presentation

In the three-body problem with two equal small masses, the Lagrange equilibrium is well-known. But what if we start inclining the small masses' orbits? We find numerical evidence of a family of quasi-periodic orbits emerging from the Lagrange equilibrium. We then draw links to the restricted problem, as well as the P12 family in the case of equal masses.

55. Complex nitriles at the surface of TNOs revealed by DiSCo-JWST

Sasha Cryan (Institut d'Astrophysique Spatiale)

11/04/2025 15:00

Astrophysics

Oral presentation

CN-bearing constituents in refractory organic residues have been reported across various regions of the Solar System, from the moons of the giant planets to the dark refractory material observed on some comets and in rare ultracarbonaceous micrometeorites recovered on Earth. These compounds form and evolve through thermal, photochemical, and irradiation-driven chemical pathways. Consequently,...

58. Model the N+ emission in the Milky Way

Guillaume Vigoureux (ENS - LPENS)

11/04/2025 15:15

Astrophysics

Oral presentation

Context : Stars are formed in the neutral regions of a Galaxy. However, in the Milky Way, the neutral and ionised regions represent almost the same volume. To have a better understanding of the star formation, we then need to understand which phenomena are responsible of the ionisation in the Milky Way. The common view is that the star radiation is the phenomenon which creates ionized regions....

89. Planet-forming regions of disks in the JWST era

Pacôme ESTEVE (Institut d'Astrophysique Spatiale)

11/04/2025 15:30

Astrophysics

Oral presentation

Despite the tremendous number of exoplanets detected, planet-forming scenarios are not yet able to fully explain the large diversity of planets. They form in protoplanetary disks, by accreting gas and dust in their surroundings. It is thus necessary to study the composition of disks, especially the Carbon-to-Oxygen ratio (C/O), to better constrain planet formation. In this context, the James...