Results 11 to 20 of about 42,381 (333)
Stellar 5 min oscillations [PDF]
Solar Physics, 1983 AbstractEstimates are given for the amplitudes of stochastically excited oscillations in Main Sequence stars and cool giants; these were obtained using the equipartition between convective and pulsational energy which was originally proposed by Goldreich and Keeley.
Jørgen Christensen-Dalsgaard +1 more
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Scaling Relations for Solar-Like Oscillations: A Review
Frontiers in Astronomy and Space Sciences, 2020 The scaling relations for solar-like oscillations provide a translation of the features of the stochastic low-degree modes of oscillation in the Sun to predict the features of solar-like oscillations in other stars with convective outer layers.
Saskia Hekker, Saskia Hekker
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Topological Modes in Stellar Oscillations
The Astrophysical Journal, 2022 Abstract Stellar oscillations can be of topological origin. We reveal this deep and so far hidden property of stars by establishing a novel parallel between stars and topological insulators. We construct an Hermitian problem to derive the expression of the stellar acoustic–buoyant frequency S of nonradial adiabatic pulsations.
Leclerc, Armand +4 more
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Dark matter induced stellar oscillations
Monthly Notices of the Royal Astronomical Society: Letters, 2023 ABSTRACT It has been hypothesized that dark matter is comprised of ultra-light bosons whose collective phenomena can be described as a scalar field undergoing coherent oscillations. Examples include axion and fuzzy dark matter models. In this ultra-light dark matter (ULDM) scenario, the harmonic variation in the field’s energy–momentum ...
Sakstein, J., Saltas, Ippocratis D.
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Asteroseismology and Spectropolarimetry of the Exoplanet Host Star λ Serpentis
The Astronomical Journal, 2023 The bright star λ Ser hosts a hot Neptune with a minimum mass of 13.6 M _⊕ and a 15.5 day orbit. It also appears to be a solar analog, with a mean rotation period of 25.8 days and surface differential rotation very similar to the Sun.
Travis S. Metcalfe +33 more
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The Astrophysical Journal, 2023 To decipher complex patterns of gravity-mode period spacings observed for intermediate-mass main-sequence stars is an important step toward a better understanding of the structure and dynamics in the deep radiative region of the stars.
Yoshiki Hatta
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The Astrophysical Journal Letters, 2023 High-eccentricity migration is a likely formation mechanism for many observed hot Jupiters, particularly those with a large misalignment between the stellar spin axis and orbital angular momentum axis of the planet.
Michelle Vick, Yubo Su, Dong Lai
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Overstable Convective Modes in a Polytropic Stellar Atmosphere
The Astrophysical Journal, 2023 Within the convection zone of a rotating star, the presence of the Coriolis force stabilizes long-wavelength convective modes. These modes, which would have been unstable if the star lacked rotation, are called overstable convective modes or thermal ...
Bradley W. Hindman, Rekha Jain
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Interaction Between Convection and Pulsation
Living Reviews in Solar Physics, 2015 This article reviews our current understanding of modelling convection dynamics in stars. Several semi-analytical time-dependent convection models have been proposed for pulsating one-dimensional stellar structures with different formulations for how the
Günter Houdek, Marc-Antoine Dupret
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Kolmogorov Unstable Stellar Oscillations [PDF]
Solar Physics, 1983 AbstractWe survey the mathematics of non-linear Hamiltonian oscillations with emphasis being laid on the more recently discovered Kolmogorov instability. In the context of radial adiabatic oscillations of stars this formalism predicts a Kolmogorov instability even at low oscillation energies, provided that sufficiently high linear asymptotic modes have
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