Results 11 to 20 of about 1,022 (263)
A MULTI-PERIOD OSCILLATION IN A STELLAR SUPERFLARE [PDF]
The Astrophysical Journal, 2015 Flares that are orders of magnitude larger than the most energetic solar flares are routinely observed on Sun-like stars, raising the question of whether the same physical processes are responsible for both solar and stellar flares. In this letter we present a white-light stellar superflare on the star KIC9655129, observed by NASA's Kepler mission ...
C. E. Pugh +2 more
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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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Oscillations in stellar superflares [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 Two different mechanisms may act to induce quasi-periodic pulsations (QPP) in whole-disk observations of stellar flares. One mechanism may be magneto-hydromagnetic (MHD) forces and other processes acting on flare loops as seen in the Sun. The other mechanism may be forced local acoustic oscillations due to the high-energy particle impulse generated by ...
Balona, L.A. +5 more
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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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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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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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An essay on stellar oscillations and evolution [PDF]
Solar Physics, 1983 AbstractIt is cautioned that solar models adjusted in such a way as to achieve a match between theoretical solar oscillation characteristics and observed ones may produce neutrino fluxes inconsistent with the observations and that this is likely to be explicable as a deficiency in modeling that portion of the envelope which is most strongly affected by
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Seismological insights into solar and stellar magnetic activity cycles
EPJ Web of Conferences, 2017 The Sun’s magnetic activity cycle varies primarily on a time scale of approximately 11yrs from minimum to maximum and back again. It is well-known that the properties of the Sun’s acoustic oscillations are affected by the near-surface internal magnetic ...
Broomhall Anne-Marie
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Cracking Strange Stars by Torsional Oscillations
Universe, 2018 Strange stars are one of the possible compact stellar objects formed in the core collapse of supernovae. These hypothetical stars are made by deconfined quark matter and are selfbound.
Francesco Tonelli, Massimo Mannarelli
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