Results 1 to 10 of about 260 (195)

Analysis of Pseudo-Lyapunov Exponents of Solar Convection Using State-of-the-Art Observations [PDF]

Entropy, 2021
The solar photosphere and the outer layer of the Sun’s interior are characterized by convective motions, which display a chaotic and turbulent character.
Giorgio Viavattene, Mariarita Murabito, Salvatore L. Guglielmino, Ilaria Ermolli, Giuseppe Consolini, Fabrizio Giorgi, Shahin Jafarzadeh   +6 more
doaj   +2 more sources

Granulation and Convectional Driving on Stellar Surfaces

Astrophysical Journal Letters
Surface convection is important for the presence of magnetic activity at stars. So far, this convection is thought to be a result of heating from below, where convection cells rise and break up.
Philippe-A. Bourdin
exaly   +2 more sources

Precise Stellar Surface Gravities From the Time Scales of Convectively Driven Brightness Variations [PDF]

Science Advances, 2016
Daniel Huber, Saskia Hekker, Rafael A. Garcia   +2 more
exaly   +2 more sources

Impact of stellar variability on exoplanet detectability and characterisation

Comptes Rendus. Physique, 2023
Stellar variability has become a major issue to detect low mass planets using the radial velocity technique. I present the approaches followed to characterise the amplitude and the properties of stellar variability in radial velocity.
Meunier, Nadège
doaj   +1 more source

Impact of Correlated Noise on the Mass Precision of Earth-analog Planets in Radial Velocity Surveys

The Astronomical Journal, 2023
Characterizing the masses and orbits of near-Earth-mass planets is crucial for interpreting observations from future direct imaging missions (e.g., HabEx, LUVOIR).
Jacob K. Luhn, Eric B. Ford, Zhao Guo, Christian Gilbertson, Patrick Newman, Peter Plavchan, Jennifer A. Burt, Johanna Teske, Arvind F. Gupta   +8 more
doaj   +1 more source

Granulation signatures as seen by Kepler short-cadence data

Astronomy & Astrophysics
Context. Stellar granulation arises from near-surface convection and is imprinted in stellar photometric time series. Yet the links between granulation observables and fundamental stellar properties remain underexploited. Aims.
Larsen J. R., Lundkvist M. S., Davies G. R., Nielsen M. B.   +3 more
doaj   +3 more sources

SSI: The Stellar Seismic Indices Data Base *

EPJ Web of Conferences, 2017
The Stellar Seismic Indices database (hereafter SSI) has been developed within the SPACEInn project funded under the UE Seventh Framework Programme (FP7). This data base aims at providing stellar seismic indices of solar-like oscillating stars as well as
Samadi Reza, De Assis Peralta Raphael, Michel Eric, Belkacem Kévin, Renie Christian, Abed Mahfoudh   +5 more
doaj   +1 more source

Stellar Turbulent Convection: The Multiscale Nature of the Solar Magnetic Signature

Atmosphere, 2021
The multiscale dynamics associated with turbulent convection present in physical systems governed by very high Rayleigh numbers still remains a vividly disputed topic in the community of astrophysicists, and in general, among physicists dealing with heat
Stefano Scardigli, Francesco Berrilli, Dario Del Moro, Luca Giovannelli   +3 more
doaj   +1 more source

Extraction of seismic indices and stellar granulation parameters for CoRoT and Kepler red giants using the MLEUP method. Main results and perspectives

EPJ Web of Conferences, 2017
In the framework of the SPACEInn project, a Stellar Seismic Indices (SSI - http://ssi.lesia.obspm.fr/) database was developed in order to provide the scientific community with oscillations and granulation signatures for a large set of red-giant type ...
de Assis Peralta Raphaël, Samadi Réza, Michel Éric   +2 more
doaj   +1 more source

Disentangling stellar activity from exoplanetary signals with interferometry

EPJ Web of Conferences, 2015
Stellar activity can express as many forms at stellar surfaces: dark spots, convective cells, bright plages. Particularly, dark spots and bright plages add noise on photometric data or radial velocity measurements used to detect exoplanets, and thus lead
Ligi Roxanne, Mourard Denis, Lagrange Anne-Marie, Perraut Karine, Chiavassa Andrea   +4 more
doaj   +1 more source