A differentiable and optimizable 3D model for interpretation of observed spectral data cubes

Abstract

Aims. Molecular spectral cubes of prestellar cores encode the information on the physical and chemical properties of these objects along the line of sight. To retrieve this information, we need an interpretable model that reproduces the observed spectra. Methods. We designed a differentiable 3D geometrical model that produces synthetic observations from the parameterized density and velocity fields, and that can be efficiently optimized to reproduce the real data cubes. The model has been applied to p -NH 2 D and N 2 D + spectral cubes in the prestellar core L1544. Results. The optimized model suggests that to reproduce the observed velocity difference between p -NH 2 D and N 2 D + in L1544, an asymmetric structure in density and velocity is necessary.

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BibTeX RIS

BibTeX

@article{grassi2026differentiable,
  title = {{A differentiable and optimizable 3D model for interpretation of observed spectral data cubes}},
  author = {T. Grassi and J E Pineda and S. Spezzano and D Arzoumanian and F Lique and Y. Misugi and E. Redaelli and S. S. Jensen and P. Caselli},
  journal = {Astronomy \& Astrophysics - A\&A},
  year = {2026},
  month = sep,
  doi = {10.1051/0004-6361/202659232},
  url = {https://hal.science/hal-05767290v1},
  note = {CC BY},
}

RIS

TY  - JOUR
TI  - A differentiable and optimizable 3D model for interpretation of observed spectral data cubes
AU  - T. Grassi
AU  - J E Pineda
AU  - S. Spezzano
AU  - D Arzoumanian
AU  - F Lique
AU  - Y. Misugi
AU  - E. Redaelli
AU  - S. S. Jensen
AU  - P. Caselli
PY  - 2026
DA  - 2026/09/28
JO  - Astronomy & Astrophysics - A&A
DO  - 10.1051/0004-6361/202659232
UR  - https://hal.science/hal-05767290v1
AB  - Aims. Molecular spectral cubes of prestellar cores encode the information on the physical and chemical properties of these objects along the line of sight. To retrieve this information, we need an interpretable model that reproduces the observed spectra. Methods. We designed a differentiable 3D geometrical model that produces synthetic observations from the parameterized density and velocity fields, and that can be efficiently optimized to reproduce the real data cubes. The model has been applied to p -NH 2 D and N 2 D + spectral cubes in the prestellar core L1544. Results. The optimized model suggests that to reproduce the observed velocity difference between p -NH 2 D and N 2 D + in L1544, an asymmetric structure in density and velocity is necessary.
SN  - 0004-6361
SN  - 1432-0746
ER  -

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