95 citations · 805 across the 33 of their papers we have counts for
23 papers · 1 filter
Fossil Signatures of Main-sequence Convective Core Overshoot Estimated through Asteroseismic Analyses
Christopher J. Lindsay, J. M. Joel Ong, Sarbani Basu
Some physical processes that occur during a star's main-sequence evolution also affect its post main-sequence evolution. It is well known that stars with masses above approximately…
Asteroseismology and Spectropolarimetry of the Exoplanet Host Star Serpentis
Travis S. Metcalfe, Derek Buzasi, Daniel Huber +31
The bright star Ser hosts a hot Neptune with a minimum mass of 13.6 and a 15.5 day orbit. It also appears to be a solar analog, with a mean rotation period of 25.8 d…
A close-in giant planet escapes engulfment by its star
Marc Hon, Daniel Huber, Nicholas Z. Rui +39
When main-sequence stars expand into red giants, they are expected to engulf close-in planets. Until now, the absence of planets with short orbital periods around post-expansion, c…
Simplifying asteroseismic analysis of solar-like oscillators: An application of principal component analysis for dimensionality reduction
M. B. Nielsen, G. R. Davies, W. J. Chaplin +5
The asteroseismic analysis of stellar power density spectra is often computationally expensive. The models used in the analysis may use several dozen parameters to accurately descr…
Near-Core Acoustic Glitches are Not Oscillatory: Consequences for Asteroseismic Probes of Convective Boundary Mixing
Christopher J. Lindsay, J. M. Joel Ong, Sarbani Basu
Asteroseismology has been used extensively in recent years to study the interior structure and physical processes of main sequence stars. We consider prospects for using pressure m…
Revisiting the Red-giant Branch Hosts KOI-3886 and Draconis. Detailed Asteroseismic Modeling and Consolidated Stellar Parameters
Tiago L. Campante, Tanda Li, J. M. Joel Ong +23
Asteroseismology is playing an increasingly important role in the characterization of red-giant host stars and their planetary systems. Here, we conduct detailed asteroseismic mode…
Mode Mixing and Rotational Splittings: II. Reconciling Different Approaches to Mode Coupling
J. M. Joel Ong, Charlotte Gehan
In the mixed-mode asteroseismology of subgiants and red giants, the coupling between the p- and g-mode cavities must be understood well in order to derive localised estimates of in…
Evolutionary and Observational Properties of Red Giant Acoustic Glitch Signatures
David Saunders, Joel Ong, Sarbani Basu
While solar-like oscillations in red giants have been observed at massive scale by the Kepler mission, few features of these oscillation mode frequencies, other than their global p…
TESS Asteroseismic Analysis of HD 76920: The Giant Star Hosting An Extremely Eccentric Exoplanet
Chen Jiang, Tao Wu, Adina D. Feinstein +30
The Transiting Exoplanet Survey Satellite (TESS) mission searches for new exoplanets. The observing strategy of TESS results in high-precision photometry of millions of stars acros…
KIC 7955301: a hierarchical triple system with eclipse timing variations and an oscillating red giant
P. Gaulme, T. Borkovits, T. Appourchaux +13
KIC 7955301 is a hierarchical triple system with eclipse timing and depth variations discovered by the Kepler mission. It is composed of a non-eclipsing primary star at the bottom…
Mode Mixing and Rotational Splittings: I. Near-Degeneracy Effects Revisited
J. M. Joel Ong, Lisa Bugnet, Sarbani Basu
Rotation is typically assumed to induce strictly symmetric rotational splitting into the rotational multiplets of pure p- and g-modes. However, for evolved stars exhibiting mixed m…
Solar-like oscillations and ellipsoidal variations in TESS observations of the binary 12 Boötis
Warrick H. Ball, Andrea Miglio, William J. Chaplin +14
Binary stars in which oscillations can be studied in either or both components can provide powerful constraints on our understanding of stellar physics. The bright binary 12 Boötis…
Mixed Mode Asteroseismology of Red Giant Stars Through the Luminosity Bump
Christopher J. Lindsay, J. M. Joel Ong, Sarbani Basu
Most current models of low mass red giant stars do not reproduce the observed position of the red giant branch luminosity bump, a diagnostic of the maximum extent of the convective…
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…
A 20-Second Cadence View of Solar-Type Stars and Their Planets with TESS: Asteroseismology of Solar Analogs and a Re-characterization of pi Men c
Daniel Huber, Timothy R. White, Travis S. Metcalfe +50
We present an analysis of the first 20-second cadence light curves obtained by the TESS space telescope during its extended mission. We find a precision improvement of 20-second da…
Mixed Modes and Asteroseismic Surface Effects: I. Analytic Treatment
J. M. Joel Ong, Sarbani Basu, Ian W. Roxburgh
Normal-mode oscillation frequencies computed from stellar models differ from those which would be measured from stars with identical interior structures, because of modelling error…
PBjam: A Python package for automating asteroseismology of solar-like oscillators
M. B. Nielsen, G. R. Davies, W. H. Ball +14
Asteroseismology is an exceptional tool for studying stars by using the properties of observed modes of oscillation. So far the process of performing an asteroseismic analysis of a…
Differential Modelling Systematics across the HR Diagram from Asteroseismic Surface Corrections
J. M. Joel Ong, Sarbani Basu, Jean M. McKeever
Localised modelling error in the near-surface layers of evolutionary stellar models causes the frequencies of their normal modes of oscillation to differ from those of actual stars…
Robust asteroseismic properties of the bright planet host HD 38529
Warrick H. Ball, William J. Chaplin, Martin B. Nielsen +21
The Transiting Exoplanet Survey Satellite (TESS) is recording short-cadence, high duty-cycle timeseries across most of the sky, which presents the opportunity to detect and study o…
Semi-analytic Expressions for the Isolation and Coupling of Mixed Modes
J. M. Joel Ong, Sarbani Basu
In the oscillation spectra of giant stars, nonradial modes may be seen to undergo avoided crossings, which produce a characteristic "mode bumping" of the otherwise uniform asymptot…
TESS Asteroseismic Analysis of the Known Exoplanet Host Star HD 222076
Chen Jiang, Timothy R. Bedding, Keivan G. Stassun +24
The Transiting Exoplanet Survey Satellite (TESS) is an all-sky survey mission aiming to search for exoplanets that transit bright stars. The high-quality photometric data of TESS a…
Structural and Evolutionary Diagnostics from Asteroseismic Phase Functions
Joel Ong, Sarbani Basu
In the asymptotic parameterisation of mode frequencies, the phase function completely specifies the detailed structure of the frequency eigenvalues. In practice, however, th…
Explaining Deviations from the Scaling Relationship of the Large Frequency Separation
Joel Ong, Sarbani Basu
Asteroseismic large frequency separations possess great diagnostic value. However, their expressions as scaling relations are predicated on homology arguments which may not hold in…