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Related papers: Stellar granulation as seen in disk-integrated int…

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Stellar variability from pulsations and granulation presents a source of correlated noise that can impact the accuracy and precision of multi-band photometric transit observations of exoplanets. This can potentially cause biased…

Earth and Planetary Astrophysics · Physics 2018-09-19 Subhajit Sarkar , Ioannis Argyriou , Bart Vandenbussche , Andreas Papageorgiou , Enzo Pascale

Space-borne missions CoRoT and Kepler have provided a rich harvest of high-quality photometric data for solar-like pulsators. It is now possible to measure damping rates for hundreds of main-sequence and thousands of red-giant. However,…

Solar and Stellar Astrophysics · Physics 2019-05-01 K. Belkacem , F. Kupka , R. Samadi , H. Grimm-Strele

Below 1 mHz, the power spectrum of helioseismic velocity measurements is dominated by the spectrum of convective motions (granulation and supergranulation) making it difficult to detect the low-order acoustic modes and the gravity modes. We…

Astrophysics · Physics 2008-10-31 S. Lefebvre , R. A. Garcia , S. J. Jimenez-Reyes , S. Turck-Chieze , S. Mathur

Oscillations of the Sun have been used to understand its interior structure. The extension of similar studies to more distant stars has raised many difficulties despite the strong efforts of the international community over the past…

Astrophysics · Physics 2010-11-11 E. Michel , A. Baglin , M. Auvergne , C. Catala , R. Samadi

Progress in the theory of stellar convection over the past decade is reviewed. The similarities and differences between convection in stellar envelopes and laboratory convection at high Rayleigh numbers are discussed. Direct numerical…

Astrophysics · Physics 2007-05-23 H. C. Spruit

Context. The spatial power spectrum of supergranulation does not fully characterize the underlying physics of turbulent convection. For example, it does not describe the non-Gaussianity in the horizontal flow divergence. Aims. Our aim is to…

Solar and Stellar Astrophysics · Physics 2020-04-01 Vincent G. A. Böning , Aaron C. Birch , Laurent Gizon , Thomas L. Duvall , Jesper Schou

We present a methodology for the determination of empirical masses of single stars through the combination of three direct observables with Gaia and TESS: (i) the surface gravity via granulation-driven variations in the TESS light curve,…

Solar and Stellar Astrophysics · Physics 2017-12-27 Keivan G. Stassun , Enrico Corsaro , Joshua Pepper , Scott Gaudi

Theoretical atmosphere models provide the basis for a variety of applications in astronomy. In simplified one-dimensional (1D) atmosphere models, convection is usually treated with the mixing length theory despite its well-known…

Solar and Stellar Astrophysics · Physics 2015-06-17 Zazralt Magic , Remo Collet , Martin Asplund

Context. It has been shown that convection in red supergiant stars gives rise to large granules causing surface inhomogeneities together with shock waves in the photosphere. The resulting motion of the photocenter (on time scales ranging…

Solar and Stellar Astrophysics · Physics 2015-05-20 A. Chiavassa , E. Pasquato , A. Jorissen , S. Sacuto , C. Babusiaux , B. Freytag , H. -G. Ludwig , P. Cruzalebes , Y. Rabbia , A. Spang , O. Chesneau

Context. The red supergiant (RSG) Betelgeuse is an irregular variable star. Convection may play an important role in understanding this variability. Interferometric observations can be interpreted using sophisticated simulations of stellar…

Solar and Stellar Astrophysics · Physics 2015-05-18 A. Chiavassa , X. Haubois , J. S. Young , B. Plez , E. Josselin , G. Perrin , B. Freytag

We present the first coherent dynamical study of the cloud fragmentation-phase, collapse and early stellar evolution of a solar mass star. We determine young star properties as the consequence of the parent cloud evolution. Mass, luminosity…

Astrophysics · Physics 2009-11-07 G. Wuchterl , R. Klessen

State-of-the-art one-dimensional (1D) stellar evolution codes rely on simplifying assumptions, such as mixing length theory, in order to describe superadiabatic convection. As a result, 1D stellar structure models do not correctly recover…

Solar and Stellar Astrophysics · Physics 2019-08-07 Andreas Christ Sølvsten Jørgensen , Achim Weiss

Flows on the solar surface are linked to solar activity, and LCT is one of the standard techniques for capturing the dynamics of these processes by cross-correlating solar images. However, the link between contrast variations in successive…

Solar and Stellar Astrophysics · Physics 2015-06-16 M. Verma , M. Steffen , C. Denker

Unlike other stars, the surface of the Sun can be spatially resolved to a high degree of detail. But the Sun can also be observed as if it was a distant star. The availability of solar disk-resolved and disk-integrated spectra offers an…

Solar and Stellar Astrophysics · Physics 2014-11-27 Alexei Pevtsov , Luca Bertello , Brian Harker , Mark Giampapa , Andrew Marble

We use a high-resolution grid-based hydrodynamics method to simulate the multi-phase interstellar medium in a Milky Way-size quiescent disk galaxy. The models are global and three-dimensional, and include a treatment of star formation and…

Astrophysics · Physics 2009-11-13 Elizabeth J. Tasker , Greg L. Bryan

Stellar activity induced by active structures (eg, spots, faculae) is known to strongly impact the radial velocity time series. It then limits the detection of small planetary RV signals (eg, an Earth-mass planet in the habitable zone of a…

Solar and Stellar Astrophysics · Physics 2015-09-23 Simon Borgniet , Nadège Meunier , Anne-Marie Lagrange

I represent results three-dimensional numerical simulation of solar surface convection on scales local supergranulation with realistic model physics. I study thermal structure of convective motions in photosphere, the range of convection…

Astrophysics · Physics 2009-11-13 Sergey Ustyugov

Most gas in giant molecular clouds is relatively low-density and forms star inefficiently, converting only a small fraction of its mass to stars per dynamical time. However, star formation models generally predict the existence of a…

Solar and Stellar Astrophysics · Physics 2019-08-28 Shivan Khullar , Mark R. Krumholz , Christoph Federrath , Andrew J. Cunningham

Context: Observations indicate that the `quiet' solar photosphere outside active regions contains considerable amounts of magnetic energy and magnetic flux, with mixed polarity on small scales. The origin of this flux is unclear. Aims: We…

Astrophysics · Physics 2009-11-13 A. Voegler , M. Schuessler

In this study we present a simple model of elliptical galaxies aimed at interpreting the gradients in colours and narrow band indices observed across these systems. Salient features of the model are the gradients in mass density and star…

Astrophysics · Physics 2007-05-23 R. Tantalo , C. Chiosi , A. Bressan , P. Marigo , L. Portinari