Explanipedia

Mapping synthetic observations to pre-stellar core models: An interpretable machine learning approach Open

T. Grassi, M. Padovani, Daniele Galli, N. Vaytet, Sisse Siggaard Jensen , et al. · 2025

Context . We present a methodology for linking the information in the synthetic spectra with the actual information in the simulated models (i.e., their physical properties), in particular to determine where the information resides in the …

Mapping Synthetic Observations to Prestellar Core Models: An Interpretable Machine Learning Approach Open

T. Grassi, M. Padovani, D. Galli, N. Vaytet, Sigurd S. Jensen , et al. · 2025

Observations of molecular lines are a key tool to determine the main physical properties of prestellar cores. However, not all the information is retained in the observational process or easily interpretable, especially when a larger numbe…

The First European Spallation Source Data Management and Software Centre Summer School Open

Andrew R. McCluskey, Petra Aulin, Fredrik Bolmsten, Mads Bertelsen, Carina M. C. Lobley , et al. · 2024

Systematic underestimation of uncertainties by widespread neutron-scattering data-reduction software Open

Simon Heybrock, Jan-Lukas Wynen, N. Vaytet · 2023

Data-reduction software used at neutron-scattering facilities around the world, Mantid and Scipp, ignore correlations when propagating uncertainties in arithmetic operations. Normalization terms applied during data-reduction frequently hav…

Confirmation of the outflow in L1451-mm: SiO line and CH<sub>3</sub>OH maser detections Open

Valentine Wakelam, A. Coutens, P. Gratier, Thomas H. G. Vidal, N. Vaytet · 2022

Context. The observational counterparts of theoretically predicted first hydrostatic cores (FHSC) have been searched for in the interstellar medium for nearly two decades now. Distinguishing them from other types of more evolved but still …

Discs and outflows in the early phases of massive star formation: Influence of magnetic fields and ambipolar diffusion Open

B. Commerçon, M. González, R. Mignon-Risse, P. Hennebelle, N. Vaytet · 2021

Context. Massive star formation remains one of the most challenging problems in astrophysics, as illustrated by the fundamental issues of the radiative pressure barrier and the initial fragmentation. The wide variety of physical processes …

Discs and outflows in the early phases of massive star formation:\n influence of magnetic fields and ambipolar diffusion Open

B. Commerçon, M. González, R. Mignon-Risse, P. Hennebelle, N. Vaytet · 2021

We study mass accretion and ejection in the vicinity of massive star forming\ncores using high-resolution (5 au) 3D AMR numerical simulations. We investigate\nthe mechanisms at the origin of outflows and characterise the properties of the\…

Wavelength frame multiplication for reflectometry at long-pulse neutron sources Open

Oliver Löhmann, Luca Silvi, Peter M. Kadletz, N. Vaytet, Owen Arnold , et al. · 2020

The European Spallation Source (ESS), which is under construction in Lund (Sweden), will be the next leading neutron facility with an unprecedented brilliance and novel long-pulse time structure. A long-pulse source not only provides a hig…

Scipp: Scientific data handling with labeled multi-dimensional arrays for C++ and Python Open

Simon Heybrock, Owen Arnold, Igor Gudich, Daniel Nixon, N. Vaytet · 2020

scipp is heavily inspired by the Python library xarray. It enriches raw NumPy-like multi-dimensional arrays of data by adding named dimensions and associated coordinates. Multiple arrays are combined into datasets. On top of this, scipp in…

New constraints on the initial parameters of low-mass star formation from chemical modeling Open

Thomas H. G. Vidal, P. Gratier, N. Vaytet, A. Coutens, Valentine Wakelam · 2019

The complexity of physico-chemical models of star formation is increasing,\nwith models that take into account new processes and more realistic setups.\nThese models allow astrochemists to compute the evolution of chemical species\nthrough…

The challenges of modelling microphysics: ambipolar diffusion, chemistry, and cosmic rays in MHD shocks Open

Tommaso Grassi, M. Padovani, Jon P. Ramsey, Daniele Galli, N. Vaytet , et al. · 2019

From molecular clouds to protoplanetary disks, non-ideal magnetic effects are\nimportant in many astrophysical environments. Indeed, in star and disk\nformation processes, it has become clear that these effects are critical to the\nevoluti…

A recurrent nova super-remnant in the Andromeda galaxy Open

M. J. Darnley, Rebekah Hounsell, T. J. O’Brien, M. Henze, P. Rodríguez-Gil , et al. · 2019

Protostellar birth with ambipolar and ohmic diffusion Open

N. Vaytet, B. Commerçon, Jacques Masson, M. González, G. Chabrier · 2018

\n\t\t\t\tContext. The transport of angular momentum is fundamental during the formation of low-mass stars; too little removal and rotation ensures stellar densities are never reached, too much and the absence of rotation means no protopla…

Chemical solver to compute molecule and grain abundances and non-ideal MHD resistivities in prestellar core-collapse calculations Open

P. Marchand, Jacques Masson, G. Chabrier, P. Hennebelle, B. Commerçon , et al. · 2016

\n We develop a detailed chemical network relevant to calculate the conditions that are characteristic of prestellar core collapse. We solve the system of time-dependent differential equations to calculate the equilibrium abundances of mol…

Ambipolar diffusion in low-mass star formation Open

Jacques Masson, G. Chabrier, P. Hennebelle, N. Vaytet, B. Commerçon · 2015

\n Angular momentum transport and the formation of rotationally supported structures are major issues in our understanding of protostellar core formation. Whereas purely hydrodynamical simulations lead to large Keplerian disks, ideal magne…

Ambipolar diffusion in low-mass star formation. I. General comparison with the ideal MHD case Open

Jacques Masson, G. Chabrier, P. Hennebelle, N. Vaytet, B. Commerçon · 2015

In this paper, we provide a more accurate description of the evolution of the magnetic flux redistribution during prestellar core collapse by including resistive terms in the magnetohydrodynamics (MHD) equations. We focus more particularly…

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