Raphaël Mignon-Risse
Tenure-track researcher in astrophysics
Computational astrophysics
I am an astrophysicist interested in the accretion and jet processes around various astrophysical systems, from young stars to neutron stars and black holes, with a special emphasis on binary systems. To study these systems, I mainly develop and use fluid simulations and radiative transfer codes to understand how the fluid properties translate into observable diagnostics.
Accretion onto binary black holes
Since 2020, I have been trying to predict the electromagnetic emission from accreting supermassive binary black holes. This is necessary to recognize them observationally, which will be a key task when the space-based gravitational wave detector LISA is launched, in ten years. For this, I have been studying the (magneto-)hydrodynamical accretion processes and the associated electromagnetic signatures, obtained through ray-tracing calculation.
See for example:
Impact of a binary black hole on its outer circumbinary disc
Mignon-Risse, Varniere, Casse, 2023
On the origin of the lump in circumbinary discs
Mignon-Risse, Varniere, Casse, 2023
Formation of (multiple) massive stars
My PhD thesis (2017-2020) has been focused on massive star formation. As they form in opaque, far clouds, in small numbers, numerical simulations are useful to complement observational campaigns. To help us understanding their complex formation process, we numerically solve the equations of radiation-magneto-hydrodynamics.
See for example:
A new hybrid radiative transfer method for massive star formation
Mignon-Risse, González, Commerçon, Rosdahl, 2020, A&A
Collapse of turbulent massive cores with ambipolar diffusion and hybrid radiative transfer: I. Accretion and multiplicity
Mignon-Risse, González, Commerçon, Rosdahl, 2021, A&A
Collapse of turbulent massive cores with ambipolar diffusion and hybrid radiative transfer: II. Outflows
Mignon-Risse, González, Commerçon, 2021, A&A
Disk fragmentation around a massive protostar: Comparison of two 3D codes
Mignon-Risse, Oliva, González, Kuiper, Commerçon, 2023, A&A
The role of magnetic fields in the formation of multiple massive stars
Mignon-Risse, González, Commerçon, 2023, A&A
Publication list
Accretion-Ejection Talks
On-line seminars on numerical simulations of accretion-ejection processes around various objects (from young stars to compact objects)
Contact
raphael.mignon-risse at uva.es
raphael.mignon-risse at ntnu.no
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