A new asteroseismic diagnostic for internal rotation in γ Doradus stars

Ouazzani, R. M.; Salmon, Sébastien; Antoci, V.; Bedding, Timothy R.; Murphy, Simon J.; Roxburgh, I. W.

doi:10.1093/mnras/stw2717

Cited by 134 publications

(207 citation statements)

References 55 publications

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“…The γ Doradus variables are expected to display regular patterns in the period spacing (Van Reeth et al 2015Ouazzani et al 2016). As found by these previous studies, we find that in non-rotating models, the period spacings are nearly flat as a function of period, as shown in Figure 7.…”

Section: Period Spacingssupporting

confidence: 87%

Convection and Overshoot in Models of γ Doradus and δ Scuti Stars

Lovekin

Guzik

2017

ApJ

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We investigate the pulsation properties of stellar models representative of δ Scuti and γ Doradus variables. We have calculated a grid of stellar models from 1.2 to 2.2 M ⊙ , including the effects of both rotation and convective overshoot using MESA, and we investigate the pulsation properties of these models using GYRE. We discuss observable patterns in the frequency spacing for p modes and the period spacings for g modes. Using the observable patterns in g mode period spacings, it may be possible to observationally constrain the convective overshoot and rotation of a model. We also calculate the pulsation constant (Q) for all models in our grid, and investigate the variation with convective overshoot and rotation. The variation in Q values of radial modes can be used to place constraints on the convective overshoot and rotation of stars in this region. As a test case, we apply this method to a sample of 22 high amplitude δ Scuti stars (HADS), and provide estimates for the convective overshoot of the sample.

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Section: Period Spacingssupporting

confidence: 87%

Convection and Overshoot in Models of γ Doradus and δ Scuti Stars

Lovekin

Guzik

2017

ApJ

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“…Grey triangles show the slowly rotating hybrid γ Dor-δ Scuti stars from [17,19,24,28,29]. Results from the γ Dor studied by [32] and [27] are represented by grey open and filled circles, respectively. Masses of stars in grey are expected to be between ∼ 1.3 -2 M .…”

Section: Resultsmentioning

confidence: 99%

“…Recently, such features were indeed detected in the period spectra of Kepler stars ( [1,31]). Motivated by these findings, we have developed in [27] practical tools to infer the rotation in the deep layers (close to the convective core) from the observed period spacings. In particular, we have demonstrated the existence of a relation between the slope of the linear trend in the period spacings and the rotation frequency, almost independent of the metallicity or the mass of the pulsators.…”

Section: Revealing the Internal Rotation Of γ Dor Starsmentioning

confidence: 99%

The γ Dor stars as revealed by Kepler: A key to reveal deep-layer rotation in A and F stars

et al. 2017

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Abstract. The γ Dor pulsating stars present high-order gravity modes, which make them important targets in the intermediate-and low-mass main-sequence region of the Hertzsprung-Russell diagram. Whilst we have only access to rotation in the envelope of the Sun, the g modes of γ Dor stars can in principle deliver us constraints on the inner layers. With the puzzling discovery of unexpectedly low rotation rates in the core of red giants, the γ Dor stars appear now as unique targets to explore internal angular momentum transport in the progenitors of red giants. Yet, the γ Dor pulsations remain hard to detect from the ground for their periods are close to 1 day. While the CoRoT space mission first revealed intriguing frequency spectra, the almost uninterrupted 4-year photometry from the Kepler mission eventually shed a new light on them. It revealed regularities in the spectra, expected to bear signature of physical processes, including rotation, in the shear layers close to the convective core. We present here the first results of our effort to derive exploitable seismic diagnosis for mid-to fast rotators among γ Dor stars. We confirm their potential to explore the rotation history of this early phase of stellar evolution.

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“…However, the dP − P patterns are not fully exploited to derive core-to-envelope differential rotation. Ouazzani et al (2017) derived the internal rotation rates for four γ Dor stars (KIC 4253413, KIC 6762992, KIC 5476299, and KIC 4177905), but no information on the envelope rotation is provided. For a recent review, please refer to Aerts et al (2017).…”

Section: Identification Of Prograde Dipole G-modes Affected By Rotationmentioning

confidence: 99%

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

Guo

Gies

Matson

2017

ApJ

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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 of 1.2 days, and contains two stars of almost identical masses (M 1 = 1.72M ⊙ , M 2 = 1.71M ⊙ ). However, the cooler secondary star is more evolved (R 2 = 1.96R ⊙ ) while the hotter primary is still on the zero-agemain-sequence (R 1 = 1.53R ⊙ ). Coeval models from single star evolution cannot explain the observed masses and radii, and binary evolution with mass-transfer needs to be invoked. After subtracting the binary light curve, the Fourier spectrum shows low-order pressure-mode pulsations, and more dominantly, a cluster of low-frequency gravity modes at about 2 day −1 . These g-modes are nearly equally-spaced in period, and the period spacing pattern has a negative slope. We identify these g-modes as prograde dipole modes and find that they stem from the secondary star. The frequency range of unstable p-modes also agrees with that of the secondary. We derive the internal rotation rate of the convective core and the asymptotic period spacing from the observed g-modes. The resulting values suggest that the core and envelope rotate nearly uniformly, i.e., their rotation rates are both similar to the orbital frequency of this synchronized binary.-2 -

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A new asteroseismic diagnostic for internal rotation in γ Doradus stars

Cited by 134 publications

References 55 publications

Convection and Overshoot in Models of γ Doradus and δ Scuti Stars

Convection and Overshoot in Models of γ Doradus and δ Scuti Stars

The γ Dor stars as revealed by Kepler: A key to reveal deep-layer rotation in A and F stars

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

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