274 citations · 1.6k across the 33 of their papers we have counts for
25 papers · 1 filter
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…
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…
Systematics in Asteroseismic Modelling: Application of a Correlated Noise Model for Oscillation Frequencies
Tanda Li, Guy R. Davies, Martin Nielsen +2
The detailed modelling of stellar oscillations is a powerful approach to characterising stars. However, poor treatment of systematics in theoretical models leads to misinterpretati…
Asteroseismology of Scuti stars: emulating model grids using a neural network
Owen J. Scutt, Simon J. Murphy, Martin B. Nielsen +3
Young Scuti stars have proven to be valuable asteroseismic targets but obtaining robust uncertainties on their inferred properties is challenging. We aim to quantify the random…
A Catalogue of Solar-Like Oscillators Observed by TESS in 120-second and 20-second Cadence
Emily Hatt, Martin B. Nielsen, William J. Chaplin +12
The Transiting Exoplanet Survey Satellite (TESS) mission has provided photometric light curves for stars across nearly the entire sky. This allows for the application of asteroseis…
First semi-empirical test of the white dwarf mass-radius relationship using a single white dwarf via astrometric microlensing
Peter McGill, Jay Anderson, Stefano Casertano +15
In November 2019, the nearby single, isolated DQ-type white dwarf LAWD 37 (WD 1142-645) aligned closely with a distant background source and caused an astrometric microlensing even…
Unexpected solar-cycle variation of acoustic mode power in Sun-as-a-star observations
Rachel Howe, W. J. Chaplin, Y. P. Elsworth +2
We examine the solar-cycle variation of the power in the low-degree helioseismic modes by looking at binned power spectra from 45 years of observations with the Birmingham Solar Os…
A probabilistic method for detecting solar-like oscillations using meaningful prior information
M. B. Nielsen, E. Hatt, W. J. Chaplin +2
Current and future space-based observatories such as the Transiting Exoplanet Survey Satellite (TESS) and PLATO are set to provide an enormous amount of new data on oscillating sta…
Hierarchically modelling Kepler dwarfs and subgiants to improve inference of stellar properties with asteroseismology
Alexander J. Lyttle, Guy R. Davies, Tanda Li +9
With recent advances in modelling stars using high-precision asteroseismology, the systematic effects associated with our assumptions of stellar helium abundance () and the mixi…
Weakened magnetic braking supported by asteroseismic rotation rates of Kepler dwarfs
Oliver J. Hall, Guy R. Davies, Jennifer van Saders +9
Studies using asteroseismic ages and rotation rates from star-spot rotation have indicated that standard age-rotation relations may break down roughly half-way through the main seq…
Lifetimes and Rotation within the Solar Mean Magnetic Field
Eddie Ross, William J. Chaplin, Steven J. Hale +4
We have used very high-cadence (sub-minute) observations of the solar mean magnetic field (SMMF) from the Birmingham Solar Oscillations Network (BiSON) to investigate the morpholog…
TESS Asteroseismology of Mensae: Benchmark Ages for a G7 Dwarf and its M-dwarf Companion
Ashley Chontos, Daniel Huber, Travis A. Berger +27
Asteroseismology of bright stars has become increasingly important as a method to determine fundamental properties (in particular ages) of stars. The Kepler Space Telescope initiat…
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…
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…
The Evolution of Rotation and Magnetic Activity in 94 Aqr Aa from Asteroseismology with TESS
Travis S. Metcalfe, Jennifer L. van Saders, Sarbani Basu +29
Most previous efforts to calibrate how rotation and magnetic activity depend on stellar age and mass have relied on observations of clusters, where isochrones from stellar evolutio…
Solar cycle variation of in helioseismic data and its implications for asteroseismology
Rachel Howe, William J. Chaplin, Sarbani Basu +7
The frequency, , at which the envelope of pulsation power peaks for solar-like oscillators is an important quantity in asteroseismology. We measure for t…
TESS Asteroseismology of the known red-giant host stars HD 212771 and HD 203949
Tiago L. Campante, Enrico Corsaro, Mikkel N. Lund +45
The Transiting Exoplanet Survey Satellite (TESS) is performing a near all-sky survey for planets that transit bright stars. In addition, its excellent photometric precision enables…
Predicted microlensing events by nearby very-low-mass objects: Pan-STARRS DR1 vs. Gaia DR2
M. B. Nielsen, D. M. Bramich
Microlensing events can be used to directly measure the masses of single field stars to a precision of 1-10\%. The majority of direct mass measurements for stellar and sub-st…
Butterfly diagram of a Sun-like star observed using asteroseismology
M. Bazot, M. B. Nielsen, D. Mary +6
Stellar magnetic fields are poorly understood but are known to be important for stellar evolution and exoplanet habitability. They drive stellar activity, which is the main observa…
Asteroseismic detection of latitudinal differential rotation in 13 Sun-like stars
O. Benomar, M. Bazot, M. B. Nielsen +7
The differentially rotating outer layers of stars are thought to play a role in driving their magnetic activity, but the underlying mechanisms that generate and sustain differentia…
Beyond the Kepler/K2 bright limit: variability in the seven brightest members of the Pleiades
T. R. White, B. J. S. Pope, V. Antoci +20
The most powerful tests of stellar models come from the brightest stars in the sky, for which complementary techniques, such as astrometry, asteroseismology, spectroscopy, and inte…
Kepler Observations of the Asteroseismic Binary HD 176465
T. R. White, O. Benomar, V. Silva Aguirre +31
Binary star systems are important for understanding stellar structure and evolution, and are especially useful when oscillations can be detected and analysed with asteroseismology.…
Asteroseismic inversions for radial differential rotation of Sun-like stars: ensemble fits
Hannah Schunker, Jesper Schou, Warrick Ball +2
Radial differential rotation is an important parameter for stellar dynamo theory and for understanding angular momentum transport. We investigate the potential of using a large num…
Rotation and magnetism of Kepler pulsating solar-like stars. Towards asteroseismically calibrated age-rotation relations
R. A. Garcia, T. Ceillier, D. Salabert +16
Kepler ultra-high precision photometry of long and continuous observations provides a unique dataset in which surface rotation and variability can be studied for thousands of stars…