Gravity Modes Reveal the Internal Rotation of a Post-mass-transfer Gamma Doradus/Delta Scuti Hybrid Pulsator in Kepler  Eclipsing Binary KIC 9592855

Guo, Zhao; Gies, Douglas R.; Matson, Rachel A.

doi:10.3847/1538-4357/aa978c

Cited by 41 publications

(30 citation statements)

References 99 publications

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“…Type 2014; García et al 2014;Balona 2017), and deducing surface rotation by tidal locking in binaries (e.g. Kallinger et al 2017;Guo et al 2017;Zhang et al 2018). A signal caused by spots is common for low-mass stars with convective envelopes.…”

Section: Kicmentioning

confidence: 99%

Period spacings of γ Doradus pulsators in the Kepler field: Rossby and gravity modes in 82 stars

Reeth

Bedding

et al. 2019

Monthly Notices of the Royal Astronomical Society

110

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Rossby modes are the oscillations in a rotating fluid, whose restoring force is the Coriolis force. They provide an additional diagnostic to understand the rotation of stars, which complicates asteroseismic modelling. We report 82 γ Doradus stars for which clear period spacing patterns of both gravity and Rossby modes have been detected. The period spacings of both show a quasi-linear relation with the pulsation period but the slope is negative for the gravity modes and positive for the Rossby modes. Most Rossby modes have k = −2, m = −1. For only one star a series of k = −1, m = −1 modes is seen. For each pattern, the mean pulsation period, the mean period spacing, and the slope are measured. We find that the slope correlates with the mean period for Rossby mode patterns. The traditional approximation of rotation is used to measure the near-core rotation rate, assuming the star rotates rigidly. We report the near-core rotation rates, the asymptotic period spacings, and the radial orders of excited modes of these 82 main-sequence stars. The near-core rotation rates lie between 0.6 d −1 and 2.3 d −1 . Six stars show surface rotation modulations, among which only KIC 3341457 shows differential rotation while the other five stars have uniform rotations. The radial orders of excited modes show different distributions for the dipole and quadrupole gravity modes versus the Rossby modes.

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Section: Kicmentioning

confidence: 99%

Period spacings of γ Doradus pulsators in the Kepler field: Rossby and gravity modes in 82 stars

Reeth

Bedding

et al. 2019

Monthly Notices of the Royal Astronomical Society

110

View full text Add to dashboard Cite

show abstract

“…The known γ Dor binaries whose period spacings have already been measured are: KIC 3341457 (Li et al 2019b(Li et al , 2020; KIC 4142768 ; KIC 7385478 Ozdarcan & Dal 2017); KIC 8197406 (Li et al 2020); KIC 8197761 (Li et al 2019a); KIC 9592855 (Guo, Gies & Matson 2017); KIC 10080943 in which both components pulsate (Keen et al 2015;Schmid & Aerts 2016;Schmid et al 2015); and KIC 10486425 (Zhang et al 2018).…”

Section: Sample Selectionmentioning

confidence: 99%

The effect of tides on near-core rotation: analysis of 35 Kepler γ Doradus stars in eclipsing and spectroscopic binaries

Guo

Fuller

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We systematically searched for gravity- and Rossby-mode period spacing patterns in Kepler eclipsing binaries with γ Doradus pulsators. These stars provide an excellent opportunity to test the theory of tidal synchronisation and angular momentum transport in F- and A-type stars. We discovered 35 systems that show clear patterns, including the spectroscopic binary KIC 10080943. Combined with 45 non-eclipsing binaries with γ Dor components that have been found using pulsation timing, we measured their near-core rotation rates and asymptotic period spacings. We find that many stars are tidally locked if the orbital periods are shorter than 10 days, in which the near-core rotation periods given by the traditional approximation of rotation (TAR) are consistent with the orbital period. Compared to the single stars, γ Dor stars in binaries tend to have slower near-core rotation rates, likely a consequence of tidal spin-down. We also find three stars that have extremely slow near-core rotation rates. To explain these, we hypothesise that unstable tidally excited oscillations can transfer angular momentum from the star to the orbit, and slow the star below synchronism, a process we refer to as ‘inverse tides’.

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“…Promising targets for tidal asteroseismology include Algol-type systems in which the mass-accreting primary exhibits p modes (i.e. oEA systems) having gained a considerable fraction of its mass from an evolved secondary filling its Roche lobe (Mkrtichian et al 2002(Mkrtichian et al , 2004Tkachenko et al 2009;Guo et al 2016Guo et al , 2017. The prototype of the oEA class, RZ Cas, revealed strong accretion-driven variability in its pulsation modes (Mkr-1 binary catalog: http://keplerEBs.villanova.edu tichian et al 2018), hence motivating renewed observational and theoretical efforts to use pulsation modes to probe the influence of angular momentum transfer and tides on stellar structure and rotation.…”

Section: Introductionmentioning

confidence: 99%

Discovery of Tidally Perturbed Pulsations in the Eclipsing Binary U Gru: A Crucial System for Tidal Asteroseismology

Bowman

Johnston

Tkachenko

et al. 2019

ApJL

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The interior physics of stars is currently not well constrained for early-type stars. This is particularly pertinent for multiple systems as binary interaction becomes more prevalent for more massive stars, which strongly affects their evolution. High-precision photometry from the Transiting Exoplanet Survey Satellite (TESS) mission offers the opportunity to remedy the dearth of observations of pulsating stars that show evidence of binary interaction, specifically pulsating mass-accreting components of semidetached Algol-type eclipsing binary (oEA) systems. We present the TESS light curve of the circular eclipsing binary system U Gru (TIC 147201138), which shows evidence for free heat-driven pressure modes and a series of tidally-perturbed pressure modes. We highlight the asteroseismic potential of studying pulsating stars in binary systems, and demonstrate how tidal asteroseismology can be applied to infer the influence of binary interaction on stellar structure.

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Gravity Modes Reveal the Internal Rotation of a Post-mass-transfer Gamma Doradus/Delta Scuti Hybrid Pulsator in Kepler Eclipsing Binary KIC 9592855

Cited by 41 publications

References 99 publications

Period spacings of γ Doradus pulsators in the Kepler field: Rossby and gravity modes in 82 stars

Period spacings of γ Doradus pulsators in the Kepler field: Rossby and gravity modes in 82 stars

The effect of tides on near-core rotation: analysis of 35 Kepler γ Doradus stars in eclipsing and spectroscopic binaries

Discovery of Tidally Perturbed Pulsations in the Eclipsing Binary U Gru: A Crucial System for Tidal Asteroseismology

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