S. Mathur
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View article: Peakbagging the <i>K2</i> KEYSTONE sample with <scp>pbjam</scp> : characterizing the individual mode frequencies in solar-like oscillators
Peakbagging the <i>K2</i> KEYSTONE sample with <span>pbjam</span> : characterizing the individual mode frequencies in solar-like oscillators Open
The pattern of individual mode frequencies in solar-like oscillators provides valuable insight into their properties and interior structures. The identification and characterization of these modes requires high signal-to-noise and frequenc…
View article: Beyond the Nyquist frequency
Beyond the Nyquist frequency Open
Subgiants and early red giants are crucial for studying the first dredge-up, a key evolutionary phase in which the convective envelope deepens, mixing previously interior-processed material and bringing it to the surface. Yet, very few hav…
View article: Luminaries in the sky: The TESS legacy sample of bright stars
Luminaries in the sky: The TESS legacy sample of bright stars Open
Aims . We aim to detect and characterise solar-like oscillations in bright naked-eye ( V <6) main-sequence and subgiant stars observed by the Transiting Exoplanet Survey Satellite (TESS). In doing so, we seek to expand the current benchmar…
View article: Structure and Dynamics of the Sun’s Interior Revealed by the Helioseismic and Magnetic Imager
Structure and Dynamics of the Sun’s Interior Revealed by the Helioseismic and Magnetic Imager Open
View article: Red giant evolutionary status determination: The complete <i>Kepler</i> catalog
Red giant evolutionary status determination: The complete <i>Kepler</i> catalog Open
Context. Evolved cool stars have three distinct evolutionary status: shell-hydrogen burning (RGB), core-helium and shell-hydrogen burning (RC), and double-shell burning (AGB). Asteroseismology can distinguish between the RC and the other s…
View article: Magnetic Activity Evolution of Solar-like Stars. II. <i>S</i> <sub>ph</sub>–Ro Evolution of Kepler Main-sequence Targets
Magnetic Activity Evolution of Solar-like Stars. II. <i>S</i> <sub>ph</sub>–Ro Evolution of Kepler Main-sequence Targets Open
There is now a large sample of stars observed by the Kepler satellite with measured rotation periods and photometric activity index S ph . We use this data, in conjunction with stellar interiors models, to explore the interplay of magnetis…
View article: <i>Kepler</i> meets <i>Gaia</i> DR3: Homogeneous extinction-corrected color-magnitude diagram and binary classification
<i>Kepler</i> meets <i>Gaia</i> DR3: Homogeneous extinction-corrected color-magnitude diagram and binary classification Open
The original Kepler mission has delivered unprecedented high-quality photometry. These data have impacted numerous research fields (e.g., asteroseismology and exoplanets), and continue to be an astrophysical goldmine. Because of this, thor…
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: Magnetic activity evolution of solar-like stars: II. $S_{\rm ph}$-Ro evolution of Kepler main-sequence targets
Magnetic activity evolution of solar-like stars: II. $S_{\rm ph}$-Ro evolution of Kepler main-sequence targets Open
There is now a large sample of stars observed by the Kepler satellite with measured rotation periods and photometric activity index $S_{\rm ph}$. We use this data, in conjunction with stellar interiors models, to explore the interplay of m…
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 impact of rotation on the stochastic excitation of stellar acoustic modes in solar-like pulsators
The impact of rotation on the stochastic excitation of stellar acoustic modes in solar-like pulsators Open
Recent observational results from asteroseismic studies show that an important fraction of solar-like stars do not present detectable stochastically excited acoustic oscillations. This non-detectability seems to correlate with a high rotat…
View article: TOI-2458 b: A mini-Neptune consistent with in situ hot Jupiter formation
TOI-2458 b: A mini-Neptune consistent with in situ hot Jupiter formation Open
We report on the discovery and spectroscopic confirmation of TOI-2458 b, a transiting mini-Neptune around an F-type star leaving the main-sequence with a mass of M ★ = 1.05 ± 0.03 M ⊙ , a radius of R ★ = 1.31 ± 0.03 R ⊙ , an effective temp…
View article: Red giants evolutionary status determination: the complete Kepler catalog
Red giants evolutionary status determination: the complete Kepler catalog Open
Evolved cool stars have three distinct evolutionary status: shell Hydrogen-burning (RGB), core Helium and shell Hydrogen burning (RC), and double shell burning (AGB). Asteroseismology can distinguish between the RC and the other status, bu…
View article: Seismic differences between solar magnetic cycles 23 and 24 for low-degree modes
Seismic differences between solar magnetic cycles 23 and 24 for low-degree modes Open
Solar magnetic activity follows regular cycles of about 11 years with an inversion of polarity in the poles every ∼22 years. This changing surface magnetism impacts the properties of the acoustic modes. The acoustic mode frequency shifts a…
View article: Seismic differences between solar magnetic cycles 23 and 24 for low-degree modes
Seismic differences between solar magnetic cycles 23 and 24 for low-degree modes Open
Solar magnetic activity follows regular cycles of about 11 years with an inversion of polarity in the poles every 22 years. This changing surface magnetism impacts the properties of the acoustic modes. The acoustic mode frequency shifts ar…
View article: Impact of uniform rotation on the stochastic excitation of acoustic modes in solar-like oscillators
Impact of uniform rotation on the stochastic excitation of acoustic modes in solar-like oscillators Open
We evaluate the impact of the rotation on the stochastic excitation of acoustic (p) modes in solar-like pulsators. First, we derive the forced wave equation taking rotation into account and we compute the source terms, which inject energy …
View article: The phase separation landscape of genome-wide genetic perturbations
The phase separation landscape of genome-wide genetic perturbations Open
Summary Biomolecular organization is central to cell function. While phase separation is a key mechanism orchestrating this organization, we lack a comprehensive view of genes that can globally influence this process in vivo . To identify …
View article: Convection, rotation, and magnetic activity of solar-like stars from asteroseismology
Convection, rotation, and magnetic activity of solar-like stars from asteroseismology Open
During the last decade, our understanding of stellar physics and evolution has undergone a tremendous revolution thanks to asteroseismology. Space missions such as CoRoT, \kep, K2, and TESS have already been observing millions of stars pro…
View article: Perspectives on the physics of late-type stars from beyond low earth orbit, the moon and mars
Perspectives on the physics of late-type stars from beyond low earth orbit, the moon and mars Open
View article: Nintedanib alleviates polypropylene mesh-induced adhesion in rabbit ventral herniorrhaphy
Nintedanib alleviates polypropylene mesh-induced adhesion in rabbit ventral herniorrhaphy Open
BACKGROUND: Nintedanib (previously known as BBIF 1120) was approved by the United States Food and Drug Administration and European Medical Agency to treat idiopathic lung fibrosis in the year 2014 and 2015, respectively. It is now gaining …
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: TOI-2458 b: A mini-Neptune consistent with in situ hot Jupiter formation
TOI-2458 b: A mini-Neptune consistent with in situ hot Jupiter formation Open
We report on the discovery and spectroscopic confirmation of TOI-2458 b, a transiting mini-Neptune around an F-type star leaving the main-sequence with a mass of $M_\star=1.05 \pm 0.03$ M$_{\odot}$, a radius of $R_\star=1.31 \pm 0.03$ R$_{…
View article: TOI-1408: Discovery and Photodynamical Modeling of a Small Inner Companion to a Hot Jupiter Revealed by Transit Timing Variations
TOI-1408: Discovery and Photodynamical Modeling of a Small Inner Companion to a Hot Jupiter Revealed by Transit Timing Variations Open
We report the discovery and characterization of a small planet, TOI-1408 c, on a 2.2 day orbit located interior to a previously known hot Jupiter, TOI-1408 b ( P = 4.42 days, M = 1.86 ± 0.02 M Jup , R = 2.4 ± 0.5 R Jup ) that exhibits graz…
View article: Five new eclipsing binaries with low-mass companions
Five new eclipsing binaries with low-mass companions Open
Precise space-based photometry from the Transiting Exoplanet Survey Satellite results in a huge number of exoplanetary candidates. However, the masses of these objects are unknown and must be determined by ground-based spectroscopic follow…
View article: Measuring stellar surface rotation and activity with the PLATO mission
Measuring stellar surface rotation and activity with the PLATO mission Open
The Planetary Transits and Oscillations of stars mission (PLATO) will allow us to measure surface rotation and monitor photometric activity of tens of thousands of main sequence solar-type and subgiant stars. This paper is the first of a s…
View article: Measuring stellar surface rotation and activity with the PLATO mission -- I. Strategy and application to simulated light curves
Measuring stellar surface rotation and activity with the PLATO mission -- I. Strategy and application to simulated light curves Open
The Planetary Transits and Oscillations of stars mission (PLATO) will allow us to measure surface rotation and monitor photometric activity of tens of thousands of main sequence solar-type and subgiant stars. This paper is the first of a s…
View article: On the origin of the dearth of hot exoplanets around fast-rotating stars
On the origin of the dearth of hot exoplanets around fast-rotating stars Open
In 2013, a dearth of close-in planets around fast-rotating host stars wasfound using statistical tests on Kepler data. The addition of more Kepler andTransiting Exoplanet Survey Satellite (TESS) systems in 2022 seemingly filled this region…
View article: A low-mass sub-Neptune planet transiting the bright active star HD 73344
A low-mass sub-Neptune planet transiting the bright active star HD 73344 Open
Context. Planets with radii of between 2 and 4 R ⊕ closely orbiting solar-type stars are of significant importance for studying the transition from rocky to giant planets, and are prime targets for atmospheric characterization by missions …
View article: The APO-K2 Catalog. II. Accurate Stellar Ages for Red Giant Branch Stars across the Milky Way
The APO-K2 Catalog. II. Accurate Stellar Ages for Red Giant Branch Stars across the Milky Way Open
We present stellar age determinations for 4661 red giant branch stars in the APO-K2 catalog, derived using mass estimates from K2 asteroseismology from the K2 Galactic Archaeology Program and elemental abundances from the Apache Point Gala…
View article: Nature versus nurture: distinguishing effects from stellar processing and chemical evolution on carbon and nitrogen in red giant stars
Nature versus nurture: distinguishing effects from stellar processing and chemical evolution on carbon and nitrogen in red giant stars Open
The surface [C/N] ratios of evolved giants are strongly affected by the first dredge-up (FDU) of nuclear-processed material from stellar cores. C and N also have distinct nucleosynthetic origins and serve as diagnostics of mixing and mass-…