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...
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.
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,...
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....
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...
