Siddharth Dhanpal
YOU?
Author Swipe
View article: Anomalously Fast Core and Envelope Rotation in Red Giants
Anomalously Fast Core and Envelope Rotation in Red Giants Open
Red giants undergo dramatic and complex structural transformations as they evolve. Angular momentum is transported between the core and envelope during this epoch, a poorly understood process. Here, we infer envelope and core rotation rate…
View article: Seismic Constraints on the Spin Evolution of Slowly Rotating Young Intermediate-mass Stars
Seismic Constraints on the Spin Evolution of Slowly Rotating Young Intermediate-mass Stars Open
δ Scuti stars are hot, rapid rotators and a poorly understood class of pulsators. Asteroseismology provides the only means with which to probe their interior dynamics. However, their complex and unexplained oscillation patterns restrict an…
View article: Pushing the boundaries of asteroseismic individual frequency modelling: Unveiling two evolved very low-metallicity red giants
Pushing the boundaries of asteroseismic individual frequency modelling: Unveiling two evolved very low-metallicity red giants Open
Context. Metal-poor stars play a crucial role in understanding the nature and evolution of the first stellar generation in the Galaxy. Previously, asteroseismic characterisation of red-giant stars has relied on constraints from the global …
View article: Supplementary resources for the manuscript "Seismic constraints on the spin evolution of slowly rotating young intermediate-mass stars" at The Astrophysical Journal.
Supplementary resources for the manuscript "Seismic constraints on the spin evolution of slowly rotating young intermediate-mass stars" at The Astrophysical Journal. Open
Please refer to the "supplementary resources" section of the manuscript for the description on the contents of the following files. Brief explanations of the files: csv file (Supp1_TIC_Ids_5381_star.csv) with TIC IDs of 5381 delta Scuti st…
View article: Quadratic Frequency Dispersion in the Oscillations of Intermediate-mass Stars
Quadratic Frequency Dispersion in the Oscillations of Intermediate-mass Stars Open
Asteroseismology, the study of stellar vibration, has met with great success, shedding light on stellar interior structure, rotation, and magnetism. Prominently known as δ Scutis, the intermediate-mass main-sequence oscillators that often …
View article: Codes used in the publication "Quadratic frequency dispersion in the oscillations of intermediate-mass stars".
Codes used in the publication "Quadratic frequency dispersion in the oscillations of intermediate-mass stars". Open
The file "inlist_project" contains the codes used for evolving intermediate mass stars through MESA. We used MESA version r23.05.1 with the MESA SDK version x86_64-linux-22.6.1 for this work. We have neither modified nor created any new fi…
View article: Magnetic Flux in the Sun Emerges Unaffected by Supergranular-scale Surface Flows
Magnetic Flux in the Sun Emerges Unaffected by Supergranular-scale Surface Flows Open
Magnetic flux emergence from the convection zone into the photosphere and beyond is a critical component of the behavior of large-scale solar magnetism. Flux rarely emerges amid field-free areas at the surface, but when it does, the intera…
View article: Asteroseismology Applied to Constrain Structure Parameters of δ Scuti Stars
Asteroseismology Applied to Constrain Structure Parameters of δ Scuti Stars Open
Asteroseismology is a powerful tool to probe stellar structure. Spaceborne instruments like CoRoT, Kepler, and TESS have observed the oscillations of numerous stars, among which δ Scutis are particularly interesting, owing to their fast ro…
View article: Inferring Coupling Strengths of Mixed-mode Oscillations in Red Giant Stars Using Deep Learning
Inferring Coupling Strengths of Mixed-mode Oscillations in Red Giant Stars Using Deep Learning Open
Asteroseismology is a powerful tool that may be applied to shed light on stellar interiors and stellar evolution. Mixed modes, behaving like acoustic waves in the envelope and buoyancy modes in the core, are remarkable because they allow f…
View article: Asteroseismology applied to constrain structure parameters of δ Scuti stars
Asteroseismology applied to constrain structure parameters of δ Scuti stars Open
Asteroseismology is a powerful tool to probe the structure of stars. Space-borne instruments like CoRoT, Kepler and TESS have observed the oscillations of numerous stars, among which δ Scutis are particularly interesting owing to their fas…
View article: Inferring coupling strengths of mixed-mode oscillations in red-giant stars using deep learning
Inferring coupling strengths of mixed-mode oscillations in red-giant stars using deep learning Open
Asteroseismology is a powerful tool that may be applied to shed light on stellar interiors and stellar evolution. Mixed modes, behaving as acoustic waves in the envelope and buoyancy modes in the core, are remarkable because they allow for…
View article: Measuring Frequency and Period Separations in Red-giant Stars Using Machine Learning
Measuring Frequency and Period Separations in Red-giant Stars Using Machine Learning Open
Asteroseismology is used to infer the interior physics of stars. The Kepler and TESS space missions have provided a vast data set of red-giant lightcurves, which may be used for asteroseismic analysis. These data sets are expected to signi…
View article: A no-hair test for binary black holes
A no-hair test for binary black holes Open
One of the consequences of the black-hole “no-hair” theorem in general relativity (GR) is that gravitational radiation (quasinormal modes) from a perturbed Kerr black hole is uniquely determined by its mass and spin. Thus, the spectrum of …