479 citations · 1.7k across the 35 of their papers we have counts for
30 papers · 1 filter
Finite-Element Asteroseismology I: Two-Dimensional Adiabatic Oscillations of Rapidly Rotating N=3 Polytropes
Zhao Guo, Adrian J. Barker
We develop a finite-element formulation for linear adiabatic oscillations of axisymmetric uniformly rotating, centrifugally distorted, self-gravitating N=3 polytropes. Equilibrium…
Tidally excited gravity waves in the cores of solar-type stars: resonances and critical-layer formation
Zhao Guo, Gordon I. Ogilvie, Adrian J. Barker
We simulate the propagation and dissipation of tidally induced nonlinear gravity waves in the cores of solar-type stars. We perform hydrodynamical simulations of a previously devel…
Modeling Stellar Oscillations and Granulation in Radial Velocity Time Series: A Fourier-based Method
Zhao Guo, Eric B. Ford, Dennis Stello +4
Tens of thousands of solar-like oscillating stars have been observed by space missions. Their photometric variability in the Fourier domain can be parameterized by a sum of two sup…
A New Window to Tidal Asteroseismology: Non-linearly Excited Stellar Eigenmodes and the Period Spacing Pattern in KOI-54
Zhao Guo, Gordon I. Ogilvie, Gang Li +2
We revisit the Tidally Excited Oscillations (TEOs) in the A-type, main-sequence, eccentric binary KOI-54, the prototype of heartbeat stars. Although the linear tidal response of th…
TESS Eclipsing Binary Stars. I. Short cadence observations of 4584 eclipsing binaries in Sectors 1-26
Andrej Prsa, Angela Kochoska, Kyle E. Conroy +44
In this paper we present a catalog of 4584 eclipsing binaries observed during the first two years (26 sectors) of the TESS survey. We discuss selection criteria for eclipsing binar…
Detailed Characterization of Heartbeat Stars and their Tidally Excited Oscillations
Shelley J. Cheng, Jim Fuller, Zhao Guo +2
Heartbeat stars are a class of eccentric binary stars with short-period orbits and characteristic "heartbeat" signals in their light curves at periastron, caused primarily by tidal…
The effect of tides on near-core rotation: analysis of 35 Kepler Doradus stars in eclipsing and spectroscopic binaries
Gang Li, Zhao Guo, Jim Fuller +4
We systematically searched for gravity- and Rossby-mode period spacing patterns in Kepler eclipsing binaries with Doradus pulsators. These stars provide an excellent opportunit…
KIC 12268220: A Scuti Pulsating Star and an Active Protohelium White Dwarf in an Eclipsing Binary System
Kaiming Cui, Zhao Guo, Qing Gao +4
We present a photometric, spectroscopic, asteroseismic, and evolutionary analysis of the Algol-type eclipsing binary KIC 12268220. We find the O'Connell effect and anticorrelated e…
Tidal Asteroseismology: Possible Evidence of Non-linear Mode Coupling in an Equilibrium State in Kepler Eclipsing Binary KIC 3230227
Zhao Guo
Previously, a series of tidally-excited oscillations were discovered in the eccentric eclipsing binary KIC 3230227. The pulsation amplitudes and phases suggest the observed oscilla…
Visual Orbits of Spectroscopic Binaries with the CHARA Array. III. HD 8374 and HD 24546
Kathryn V. Lester, Francis C. Fekel, Matthew Muterspaugh +9
We present the visual orbits of two long period spectroscopic binary stars, HD 8374 and HD 24546, using interferometric observations acquired with the CHARA Array and the Palomar T…
Listening to the heartbeat: Tidal Asteroseismology in action
Zhao Guo
We briefly review the current status of the study of tidally excited oscillations (TEOs) in heartbeat binary stars. Particular attention is paid to correctly extracting the TEOs wh…
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…
HST/COS Spectra of the Wind Lines of VFTS 102 and 285
Katherine Shepard, Douglas R. Gies, Kathryn V. Lester +5
Rapid rotation in massive stars imposes a latitudinal variation in the mass loss from radiatively driven winds that can lead to enhanced mass loss at the poles (with little angular…
Tidally Excited Oscillations in Heartbeat Binary Stars: Pulsation Phases and Mode Identification
Zhao Guo, Avi Shporer, Kelly Hambleton +1
Tidal forces in eccentric binary stars known as heartbeat stars excite detectable oscillations that shed light on the processes of tidal synchronization and circularization. We exa…
The first view of Scuti and Doradus stars with the TESS mission
V. Antoci, M. S. Cunha, D. M. Bowman +63
We present the first asteroseismic results for Scuti and Doradus stars observed in Sectors 1 and 2 of the TESS mission. We utilise the 2-min cadence TESS data for a sample…
A Mass-accreting Gamma Doradus Pulsator with a Synchronized Core in Kepler Eclipsing Binary KIC 7385478
Zhao Guo, Gang Li
The short-period (P d), Algol-type eclipsing binary KIC 7385478 consists of an F-type primary star () and an evolved K-type secondary ($M_2…
KIC 4142768: An Evolved Gamma Doradus/Delta Scuti Hybrid Pulsating Eclipsing Binary with Tidally Excited Oscillations
Zhao Guo, Jim Fuller, Avi Shporer +5
We present the characterization of KIC 4142768, an eclipsing binary with two evolved A-type stars in an eccentric orbit with a period of 14 days. We measure the fundamental paramet…
Visual Orbits of Spectroscopic Binaries with the CHARA Array. II. The eclipsing binary HD 185912
Kathryn V. Lester, Douglas R. Gies, Gail H. Schaefer +8
We present the visual orbit of the double-lined eclipsing binary, HD 185912, from long baseline interferometry with the CHARA Array. We also obtain echelle spectra from the Apache…
Asteroseismology of massive stars with the TESS mission: the runaway Beta Cep pulsator PHL 346 = HN Aqr
Gerald Handler, Andrzej Pigulski, Jadwiga Daszyńska-Daszkiewicz +21
We report an analysis of the first known Beta Cep pulsator observed by the TESS mission, the runaway star PHL 346 = HN Aqr. The star, previously known as a singly-periodic pulsator…
Radial Velocities of 41 Kepler Eclipsing Binaries
Rachel A. Matson, Douglas R. Gies, Zhao Guo +1
Eclipsing binaries are vital for directly determining stellar parameters without reliance on models or scaling relations. Spectroscopically derived parameters of detached and semi-…
Gravity Modes Reveal the Internal Rotation of a Post-mass Transfer Gamma Doradus/Delta Scuti Hybrid Pulsator in Kepler Eclipsing Binary KIC 9592855
Zhao Guo, Douglas R. Gies, Rachel. A. Matson
We report the discovery of a post-mass transfer Gamma Doradus/Delta Scuti hybrid pulsator in the eclipsing binary KIC~9592855. This binary has a circular orbit, an orbital period o…
A Young Eclipsing Binary and its Luminous Neighbors in the Embedded Star Cluster Sh 2-252E
Kathryn V. Lester, Douglas R. Gies, Zhao Guo
We present a photometric and light curve analysis of an eccentric eclipsing binary in the K2 Campaign 0 field that resides in Sh 2-252E, a young star cluster embedded in an H II re…
KIC 8262223: A Post-Mass Transfer Eclipsing Binary Consisting of a Delta Scuti Pulsator and a Helium White Dwarf Precursor
Zhao Guo, Douglas R. Gies, Rachel A. Matson +3
KIC~8262223 is an eclipsing binary with a short orbital period ( d). The {\it Kepler} light curves are of Algol-type and display deep and partial eclipses, ellipsoidal vari…
Tidally Induced Pulsations in Kepler Eclipsing Binary KIC 3230227
Zhao Guo, Douglas R. Gies, Jim Fuller
KIC 3230227 is a short period ( days) eclipsing binary with a very eccentric orbit (). From combined analysis of radial velocities and {\it Kepler} light curve…