A5007597010- Stellar, planetary, and galactic studies
- Solar and Space Plasma Dynamics
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Atmospheric Ozone and Climate
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Ionosphere and magnetosphere dynamics
- Fluid Dynamics and Heat Transfer
- Computational Physics and Python Applications
- Pickering emulsions and particle stabilization
- Solar Radiation and Photovoltaics
- Particle Dynamics in Fluid Flows
Max Planck Institute for Solar System Research
2020-2023
Indian Institute of Science Education and Research Kolkata
2015
Abstract Study Analysis Group 21 (SAG21) of NASA’s Exoplanet Exploration Program was organized to study the effect stellar contamination on space-based transmission spectroscopy, a method for studying exoplanetary atmospheres by measuring wavelength-dependent radius planet as it transits its star. Transmission spectroscopy relies precise understanding spectrum star being occulted. However, stars are not homogeneous, constant light sources but have temporally evolving photospheres and...
We computed realistic 3D radiative magnetohydrodynamic (MHD) near-surface models of starspots with substantial penumbrae on cool main sequence stars using the MURaM simulation code. This work is an improvement previous starspot in a slab geometry. The umbra, penumbra, and quiet star for all are distinct, not only intensity temperature, but also thermodynamic velocity structure. These represent significant step towards modeling contribution to stellar light curves.
Abstract There are no direct spatially resolved observations of spots on stars other than the Sun, and starspot properties inferred indirectly through lightcurves spectropolarimetric data. We present first self-consistent 3D radiative MHD computations starspots G2V, K0V, M0V stars, which will help us to better understand activity, variability, magnetic fields in late-type main-sequence stars. used MURaM code, has been extensively compute “realistic” sunspots, for our simulations. aim study...
Abstract The fluting instability has been suggested as the driver of subsurface structure sunspot flux tubes. We conducted a series numerical experiments where we used tubes with different initial curvatures to study effect on spots. MURaM code, which previously simulate complete sunspots, first compute four sunspots in slab geometry and then two circular spots opposite polarities. find that curvature tube indeed determines degree will undergo—the more curved is, fluted it becomes. In...
We study the growth of a homogeneously nucleated micro-bubble amidst convective flows in water superheated close to critical point.
We compute realistic 3D radiative MHD near-surface models of starspots with substantial penumbrae on cool main-sequence stars using the MURaM simulation code. This work is an improvement previous starspot in a slab geometry. The umbra, penumbra and quiet star for all are distinct, not only intensity temperature, but also thermodynamic velocity structure. These represent significant step towards modelling contribution to stellar lightcurves.
Study Analysis Group 21 (SAG21) of NASA's Exoplanet Exploration Program (ExoPAG) was organized to study the effect stellar contamination on space-based transmission spectroscopy, a method for studying exoplanetary atmospheres by measuring wavelength-dependent radius planet as it transits its star. Transmission spectroscopy relies precise understanding spectrum star being occulted. However, stars are not homogeneous, constant light sources but have temporally evolving photospheres and...