Sarbani Basu
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View article: Ensemble seismology of Red Clump stars
Ensemble seismology of Red Clump stars Open
Stars in the Red Clump (RC) are high-metallicity, low-mass, core-helium burning stars which went through the He-flash. They are astrophysically important, since they can be used as standard candles that trace the chemical evolution of the …
View article: Linearity of Structure Kernels in Main-sequence and Subgiant Solar-like Oscillators
Linearity of Structure Kernels in Main-sequence and Subgiant Solar-like Oscillators Open
Seismic structure inversions have been used to study the solar interior for decades. With the high-precision frequencies obtained using data from the Kepler mission, it has now become possible to study other solar-like oscillators using st…
View article: Linearity of Structure Kernels in Main-sequence and Subgiant Solar-like Oscillators
Linearity of Structure Kernels in Main-sequence and Subgiant Solar-like Oscillators Open
Seismic structure inversions have been used to study the solar interior for decades. With the high-precision frequencies obtained using data from the Kepler mission, it has now become possible to study other solar-like oscillators using st…
View article: Asteroseismic Structure Inversions of Main-sequence Solar-like Oscillators with Convective Cores
Asteroseismic Structure Inversions of Main-sequence Solar-like Oscillators with Convective Cores Open
Asteroseismic inferences of main-sequence solar-like oscillators often rely on best-fit models. However, these models cannot fully reproduce the observed mode frequencies, suggesting that the internal structure of the model does not fully …
View article: K Dwarf Radius Inflation and a 10 Gyr Spin-down Clock Unveiled through Asteroseismology of HD 219134 from the Keck Planet Finder
K Dwarf Radius Inflation and a 10 Gyr Spin-down Clock Unveiled through Asteroseismology of HD 219134 from the Keck Planet Finder Open
We present the first asteroseismic analysis of the K3 V planet host HD 219134 based on four consecutive nights of radial velocities collected with the Keck Planet Finder. We apply Gold deconvolution to the power spectrum to disentangle mod…
View article: Projection-angle effects when “observing” a turbulent magnetized collapsing molecular cloud
Projection-angle effects when “observing” a turbulent magnetized collapsing molecular cloud Open
Context . Interstellar magnetic fields are thought to play a fundamental role in the evolution of star-forming regions. Polarized thermal dust emission serves as a key probe for understanding the structure of the plane-of-the-sky component…
View article: Structure and Dynamics of the Sun's Interior Revealed by Helioseismic and Magnetic Imager
Structure and Dynamics of the Sun's Interior Revealed by Helioseismic and Magnetic Imager Open
High-resolution helioseismology observations with the Helioseismic and Magnetic Imager (HMI) onboard Solar Dynamics Observatory (SDO) provide a unique three-dimensional view of the solar interior structure and dynamics, revealing a tremend…
View article: Projection-angle effects when "observing" a turbulent magnetized collapsing molecular cloud. II. Magnetic field
Projection-angle effects when "observing" a turbulent magnetized collapsing molecular cloud. II. Magnetic field Open
Interstellar magnetic fields are thought to play a fundamental role in the evolution of star-forming regions. Polarized thermal dust emission serves as a key probe for understanding the structure of the POS component of the magnetic field.…
View article: Projection-angle effects when "observing" a turbulent magnetized collapsing molecular cloud. I. Chemistry and line transfer
Projection-angle effects when "observing" a turbulent magnetized collapsing molecular cloud. I. Chemistry and line transfer Open
Most of our knowledge regarding molecular clouds and the early stages of star formation stems from molecular spectral-line observations. However, the various chemical and radiative-transfer effects, in combination with projection effects, …
View article: Projection-angle effects when “observing” a turbulent magnetized collapsing molecular cloud
Projection-angle effects when “observing” a turbulent magnetized collapsing molecular cloud Open
Context . Most of our knowledge regarding molecular clouds and the early stages of star formation stems from molecular spectral-line observations. However, the various chemical and radiative-transfer effects, in combination with projection…
View article: K-dwarf Radius Inflation and a 10-Gyr Spin-down Clock Unveiled through Asteroseismology of HD 219134 from the Keck Planet Finder
K-dwarf Radius Inflation and a 10-Gyr Spin-down Clock Unveiled through Asteroseismology of HD 219134 from the Keck Planet Finder Open
We present the first asteroseismic analysis of the K3\,V planet host HD~219134, based on four consecutive nights of radial velocities collected with the Keck Planet Finder. We applied Gold deconvolution to the power spectrum to disentangle…
View article: APOKASC-3: The Third Joint Spectroscopic and Asteroseismic Catalog for Evolved Stars in the Kepler Fields
APOKASC-3: The Third Joint Spectroscopic and Asteroseismic Catalog for Evolved Stars in the Kepler Fields Open
In the third APOKASC catalog, we present data for the complete sample of 15,808 evolved stars with APOGEE spectroscopic parameters and Kepler asteroseismology. We used 10 independent asteroseismic analysis techniques and anchor our system …
View article: The robustness of inferred envelope and core rotation rates of red giant stars from asteroseismology
The robustness of inferred envelope and core rotation rates of red giant stars from asteroseismology Open
Context. Rotation is an important phenomenon influencing stellar structure and evolution, however, it has not been adequately modelled thus far. Therefore, accurate estimates of internal rotation rates are valuable for constraining stellar…
View article: Asteroseismic Structure Inversions of Main-Sequence Solar-like Oscillators with Convective Cores
Asteroseismic Structure Inversions of Main-Sequence Solar-like Oscillators with Convective Cores Open
Asteroseismic inferences of main-sequence solar-like oscillators often rely on best-fit models. However, these models cannot fully reproduce the observed mode frequencies, suggesting that the internal structure of the model does not fully …
View article: Time Variation of the Solar Tachocline
Time Variation of the Solar Tachocline Open
We have used solar oscillation frequencies and frequency splittings obtained over solar cycles 23 and 24 and the rising phase of solar cycle 25 to investigate whether the tachocline properties (the change in the rotation rate across the ta…
View article: Asteroseismology of the Nearby K Dwarf σ Draconis Using the Keck Planet Finder and TESS
Asteroseismology of the Nearby K Dwarf σ Draconis Using the Keck Planet Finder and TESS Open
Asteroseismology of dwarf stars cooler than the Sun is very challenging owing to the low amplitudes and rapid timescales of oscillations. Here we present the asteroseismic detection of solar-like oscillations at 4-minute timescales ( …
View article: Time Variation of the Solar Tachocline
Time Variation of the Solar Tachocline Open
We have used solar oscillation frequencies and frequency splittings obtained over solar cycles 23, 24 and the rising phase of solar cycle 25 to investigate whether the tachocline properties (jump i.e., the change in the rotation rate acros…
View article: TESS Asteroseismology of β Hydri: A Subgiant with a Born-again Dynamo
TESS Asteroseismology of β Hydri: A Subgiant with a Born-again Dynamo Open
The solar-type subgiant β Hyi has long been studied as an old analog of the Sun. Although the rotation period has never been measured directly, it was estimated to be near 27 days. As a Southern Hemisphere target, it was not monitored by l…
View article: APOKASC-3: The Third Joint Spectroscopic and Asteroseismic catalog for Evolved Stars in the Kepler Fields
APOKASC-3: The Third Joint Spectroscopic and Asteroseismic catalog for Evolved Stars in the Kepler Fields Open
In the third APOKASC catalog, we present data for the complete sample of 15,808 evolved stars with APOGEE spectroscopic parameters and Kepler asteroseismology. We used ten independent asteroseismic analysis techniques and anchor our system…
View article: TESS asteroseismology of $β$ Hydri: a subgiant with a born-again dynamo
TESS asteroseismology of $β$ Hydri: a subgiant with a born-again dynamo Open
The solar-type subgiant $β$ Hyi has long been studied as an old analog of the Sun. Although the rotation period has never been measured directly, it was estimated to be near 27 days. As a southern hemisphere target it was not monitored by …
View article: Asteroseismology of the Nearby K-Dwarf $σ$ Draconis using the Keck Planet Finder and TESS
Asteroseismology of the Nearby K-Dwarf $σ$ Draconis using the Keck Planet Finder and TESS Open
Asteroseismology of dwarf stars cooler than the Sun is very challenging due to the low amplitudes and rapid timescales of oscillations. Here, we present the asteroseismic detection of solar-like oscillations at 4-minute timescales ($ν_{\ma…
View article: A New Asteroseismic Kepler Benchmark Constrains the Onset of Weakened Magnetic Braking in Mature Sun-like Stars
A New Asteroseismic Kepler Benchmark Constrains the Onset of Weakened Magnetic Braking in Mature Sun-like Stars Open
Stellar spin down is a critical yet poorly understood component of stellar evolution. In particular, results from the Kepler Mission imply that mature age, solar-type stars have inefficient magnetic braking, resulting in a stalled spin-dow…
View article: Musculoskeletal Involvement and Persistent Spleen - Regional Variation and Underexplored Risk Factors in Sickle Cell Disease: 2 Case Reports
Musculoskeletal Involvement and Persistent Spleen - Regional Variation and Underexplored Risk Factors in Sickle Cell Disease: 2 Case Reports Open
Painful bony crises and avascular necrosis (AVN) of the femur is commonly described as musculoskeletal involvement in sickle cell disease (SCD). We are presenting two cases of SCD, having diffused, disseminated, and varied musculoskeletal …
View article: The PLATO Mission
The PLATO Mission Open
PLATO (PLAnetary Transits and Oscillations of stars) is ESA's M3 mission designed to detect and characterise extrasolar planets and perform asteroseismic monitoring of a large number of stars. PLATO will detect small planets (down to <2 R_…
View article: Exploring the Substructure of the Near-surface Shear Layer of the Sun
Exploring the Substructure of the Near-surface Shear Layer of the Sun Open
The gradient of rotation in the near-surface shear layer (NSSL) of the Sun provides valuable insights into the dynamics associated with the solar activity cycle and the dynamo. Results obtained with global oscillation mode splittings lack …
View article: The K2 Asteroseismic KEYSTONE sample of Dwarf and Subgiant Solar-Like Oscillators
The K2 Asteroseismic KEYSTONE sample of Dwarf and Subgiant Solar-Like Oscillators Open
Aims . The KEYSTONE project aims to enhance our understanding of solar-like oscillators by delivering a catalogue of global asteroseismic parameters (Δ v and v max ) for 173 stars, comprising mainly dwarfs and subgiants, observed by the K2…
View article: A New Asteroseismic $\textit{Kepler}$ Benchmark Constrains the Onset of Weakened Magnetic Braking in Mature Sun-Like Stars
A New Asteroseismic $\textit{Kepler}$ Benchmark Constrains the Onset of Weakened Magnetic Braking in Mature Sun-Like Stars Open
Stellar spin down is a critical yet poorly understood component of stellar evolution. In particular, results from the Kepler Mission imply that mature age, solar-type stars have inefficient magnetic braking, resulting in a stalled spin dow…