DWAIPAYAN DEBNATH

PhD Candidate, Institute of Astronomy, KU Leuven, Belgium
Email: dwaipayan.debnath@kuleuven.be| Phone: +91 8414 82 8388/+32 497 24 3122
Leuven, Belgium

Research Interests

Massive-star atmospheres & winds· Radiative transfer & multi-D RHD· Stellar evolution & feedback· Computational astrophysics

Education

• Thesis: Multi-dimensional Modelling of Massive-Star Atmospheres
• Supervisors: Prof. Jon Sundqvist, Dr. Nicolas Moens

• Thesis: Updating Atomic Database for Astrophysical Applications; First Effects on the Wind Dynamics of Wolf-Rayet Stars
• Supervisors: Prof. Jon Sundqvist, Dr. Luka Poniatowski

Research & Professional Experience

• 2D/3D unified atmosphere & wind simulations of OB-type stars
• Implementation of NLTE line-opacity treatment for multi-D RHD models

• Obtained high-resolution optical spectra of Galactic O stars for model validation

Publications (peer-reviewed)

• Debnath D., Sundqvist J.O., Moens N., Van der Sijpt C., Verhamme O., Poniatowski L.G. 2D unified atmosphere and wind simulations of O-type stars. A&A 684, 2024. DOI 10.1051/0004-6361/202348206
• Ud-Doula A., Sundqvist J.O., Narechania N., Debnath D., Moens N., Keppens R. Suppression of photospheric turbulence in strongly magnetic O-stars in radiation-MHD simulations. A&A, 2025. DOI 10.1051/0004-6361/202452375
• González-Torà G., Sander A.A.C., Sundqvist J.O., Debnath D., Delbroek L., Josiek J., Lefever R.R., Moens N., Van der Sijpt C., Verhamme O. Improving 1D stellar atmosphere models with insights from multi-D simulations I: O-stars. A&A, 2025. DOI 10.1051/0004-6361/202452241
• Van der Sijpt C., Sundqvist J.O., Debnath D., Driessen F.A., Moens N. Structure formation in O-type stars and Wolf-Rayet stars. A&A, 2025. DOI 10.1051/0004-6361/202452385
• Sundqvist J.O., Debnath D., Backs F., Verhamme O., Moens N., Delbroek L., Dickson D., Schillemans P., Van der Sijpt C., Dirickx M. An on-the-fly line-driven-wind iterative mass-loss estimator (LIME) for hot, massive stars of arbitrary chemical compositions. A&A, 2025. DOI 10.48550/arXiv.2504.00936

Manuscripts submitted / in preparation

• Moens N., Debnath D., Van der Sijpt C., Sundqvist J.O. Atmospheric parameters from a grid of 2D O-star simulations I: Atmospheric turbulence across the HRD. A&A, in prep.
• Debnath D., Sundqvist J.O., Moens N. Multi-dimensional, time-dependent approximate NLTE unified model atmospheres with winds for hot, massive stars. A&A, in prep.
• Delbroek L., Sundqvist J.O., Debnath D. Spectral synthesis of 3D unified model atmospheres with winds for O-stars. A&A, in prep.
• Debnath D., Schillemans P., Sundqvist J.O. Radiation-Hydrodynamic Super-Eddington model naturally explains observed atmospheric and wind properties of η Car during giant eruption. A&A, in prep.

Selected Conference Contributions

• Debnath D., Poniatowski L. First effects from 3D models on observations of Wolf-Rayet stars, The Wolf-Rayet Phenomenon, Morelia, Mexico, 19–23 Jun 2023.
• Debnath D. 2D unified atmosphere and wind models of O-stars, EAS Meeting, Kraków, Poland, 10–14 Jul 2023.
• Debnath D. 2D unified atmosphere and wind models of O-stars, XshootU Wide Workshop, Prague, 25–27 Sep 2023.
• Debnath D. Multi-D Unified Atmosphere and Wind Simulations of O-Stars, POEMS, Rio de Janeiro, 24–28 Jun 2024.
• Debnath D., Moens N. From Multi-D Stellar-wind models to spectral synthesis, Fundamentals of stellar outflows, Leuven, 8–12 Jul 2024.
• Debnath D., Backs F. Line-driven-wind iterative mass-loss calculator (LIME), Vienna, 7–9 May 2025.

Seminars & Outreach

• Debnath D. Multi-D Unified Atmosphere & Wind Simulations of O-Stars, IVS Seminar Series 2023-24, Leuven.

Technical Skills

• Programming  Python, Fortran 90, C++, Bash, LaTeX
• Tools  NumPy/SciPy, Astropy, Matplotlib, f2py, Git, Jupyter, Docker
• Codes  AMRVAC, MFORCE, FASTWIND
• HPC  VSC (Leuven) cluster – MPI & OpenMP jobs

References

• Prof. Jon Sundqvist – Institute of Astronomy, KU Leuven — jon.sundqvist@kuleuven.be

Last updated: 1 July 2025