352 citations · 2.2k across the 28 of their papers we have counts for
21 papers · 1 filter
Glitch analysis and asteroseismic modelling of subgiant Herculis: confirming and interpreting the peak as the helium glitch
Advik Gupta, Kuldeep Verma, Hans Kjeldsen +7
The measurements of pressure-mode and mixed-mode oscillation frequencies in subgiant stars offer a unique opportunity to probe their internal structures -- from the surface to the…
A regularisation technique to precisely infer limb darkening using transit measurements: can we estimate stellar surface magnetic fields?
Kuldeep Verma, Pierre F. L. Maxted, Anjali Singh +2
The high-precision measurements of exoplanet transit light curves that are now available contain information about the planet properties, their orbital parameters, and stellar limb…
Did Kepler-444 have a long-lived convective core?
Mark Lykke Winther, Víctor Aguirre Børsen-Koch, Jakob Lysgaard Rørsted +2
With the greater power to infer the state of stellar interiors provided by asteroseismology, it has become possible to study the survival of initially convective cores within stars…
Advanced asteroseismic modelling: breaking the degeneracy between stellar mass and initial helium abundance
Kuldeep Verma, Jakob L. Rørsted, Aldo M. Serenelli +3
Current stellar model predictions of adiabatic oscillation frequencies differ significantly from the corresponding observed frequencies due to the non-adiabatic and poorly understo…
PLATO Hare-and-Hounds exercise: Asteroseismic model fitting of main-sequence solar-like pulsators
M. S. Cunha, I. W. Roxburgh, V. Aguirre Børsen-Koch +19
Asteroseismology is a powerful tool to infer fundamental stellar properties. The use of these asteroseismic-inferred properties in a growing number of astrophysical contexts makes…
The BAyesian STellar Algorithm (BASTA): a fitting tool for stellar studies, asteroseismology, exoplanets, and Galactic archaeology
V. Aguirre Børsen-Koch, J. L. Rørsted, A. B. Justesen +16
We introduce the public version of the BAyesian STellar Algorithm (BASTA), an open-source code written in {\tt Python} to determine stellar properties based on a set of astrophysic…
The updated BaSTI stellar evolution models and isochrones: II. alpha-enhanced calculations
A. Pietrinferni, S. L. Hidalgo, S. Cassisi +7
This is the second paper of a series devoted to present an updated release of the BaSTI ( a Bag of Stellar Tracks and Isochrones) stellar model and isochrone library. Following the…
High-precision abundances of elements in solar-type stars. Evidence of two distinct sequences in abundance-age relations
P. E. Nissen, J. Christensen-Dalsgaard, J. R. Mosumgaard +3
HARPS spectra with signal-to-noise ratios S/N > 600 at 6000 A were analysed with MARCS model atmospheres to obtain 1D LTE abundances of C, O, Na, Mg, Al, Si, Ca, Ti, Cr, Fe, Ni, Sr…
Detection and characterisation of oscillating red giants: first results from the TESS satellite
Víctor Silva Aguirre, Dennis Stello, Amalie Stokholm +78
Since the onset of the `space revolution' of high-precision high-cadence photometry, asteroseismology has been demonstrated as a powerful tool for informing Galactic archaeology in…
Helium settling in F stars: constraining turbulent mixing using observed helium glitch signature
Kuldeep Verma, Víctor Silva Aguirre
Recent developments in asteroseismology -- thanks to space-based missions such as {\it CoRoT} and {\it Kepler} -- provide handles on those properties of stars that were either comp…
Helium abundance in a sample of cool stars: measurements from asteroseismology
Kuldeep Verma, Keyuri Raodeo, Sarbani Basu +5
The structural stratification of a solar-type main sequence star primarily depends on its mass and chemical composition. The surface heavy element abundances of the solar-type star…
Model physics in low-mass solar-type stars: atomic diffusion and metallicity mixture
Benard Nsamba, Tiago L. Campante, Mário J. P. F. G. Monteiro +4
Using asteroseismic data from the Kepler satellite, we explore the systematic uncertainties arising from changes in the input physics used when constructing evolution models of sol…
Asteroseismic modelling of solar-type stars: internal systematics from input physics and surface correction methods
B. Nsamba, T. L. Campante, M. J. P. F. G. Monteiro +4
Asteroseismic forward modelling techniques are being used to determine fundamental properties (e.g. mass, radius, and age) of solar-type stars. The need to take into account all po…
Seismic measurement of the locations of the base of convection zone and helium ionization zone for stars in the {\it Kepler} seismic LEGACY sample
Kuldeep Verma, Keyuri Raodeo, H. M. Antia +4
Acoustic glitches are regions inside a star where the sound speed or its derivatives change abruptly. These leave a small characteristic oscillatory signature in the stellar oscill…
Standing on the shoulders of Dwarfs: the Kepler asteroseismic LEGACY sample II - radii, masses, and ages
Victor Silva Aguirre, Mikkel N. Lund, H. M. Antia +21
We use asteroseismic data from the Kepler satellite to determine fundamental stellar properties of the 66 main-sequence targets observed for at least one full year by the mission.…
Standing on the shoulders of Dwarfs: the asteroseismic LEGACY sample I - oscillation mode parameters
Mikkel N. Lund, Víctor Silva Aguirre, Guy R. Davies +17
The advent of space-based missions like has revolutionized the study of solar-type stars, particularly through the measurement and modeling of their resonant modes of osci…
SpaceInn hare-and-hounds exercise: Estimation of stellar properties using space-based asteroseismic data
D. R. Reese, W. J. Chaplin, G. R. Davies +15
Context: Detailed oscillation spectra comprising individual frequencies for numerous solar-type stars and red giants are or will become available. These data can lead to a precise…
Asteroseismic determination of fundamental parameters of sun-like stars using multi-layered neural networks
Kuldeep Verma, Shravan Hanasoge, Jishnu Bhattacharya +2
The advent of space-based observatories such as CoRoT and Kepler has enabled the testing of our understanding of stellar evolution on thousands of stars. Evolutionary models typica…
Asteroseismology of solar-type stars with K2
W. J. Chaplin, M. N. Lund, R. Handberg +44
We present the first detections by the NASA K2 Mission of oscillations in solar-type stars, using short-cadence data collected during K2 Campaign\,1 (C1). We understand the asteros…
A Theoretical Study of Acoustic Glitches in Low-Mass Main-Sequence Stars
Kuldeep Verma, H. M. Antia, Sarbani Basu +1
There are regions in stars, such as ionization zones and the interface between radiative and convective regions, that cause a localized sharp variation in the sound speed. These ar…
Asteroseismic estimate of helium abundance of a solar analog binary system
Kuldeep Verma, Joao P. Faria, H. M. Antia +7
16 Cyg A and B are among the brightest stars observed by Kepler. What makes these stars more interesting is that they are solar analogs. 16 Cyg A and B exhibit solar-like oscillati…