52 citations · 328 across the 26 of their papers we have counts for
26 papers
Magnetorotational instability in a solar near-surface mean-field dynamo
Axel Brandenburg, Gustav Larsson, Fabio Del Sordo +1
We address the question whether the magnetorotational instability (MRI) can operate in the near-surface shear layer (NSSL) of the Sun and how it affects the interaction with the dy…
Variable, circularly polarized radio emission from the Young Stellar Object [BHB2007]-1: another ingredient of a unique system
Simranpreet Kaur, Josep M. Girart, Daniele Viganò +7
The young stellar object [BHB2007]-1 has been extensively studied in the past at radio, millimeter, and infrared wavelengths. It shows a gap in the disk and previous observations c…
Vorticity and magnetic dynamo from subsonic expansion waves II: Dependence on magnetic Prandtl number, forcing scale, cooling time
Albert Elias-López, Fabio del Sordo, Daniele Viganò
The amplification of astrophysical magnetic fields takes place via dynamo instability in turbulent environments. The presence of vorticity is crucial for the dynamo to happen. Howe…
The role of Ohmic dissipation of internal currents on Hot Jupiter radii
Taner Akgün, Clàudia Soriano-Guerrero, Albert Elias-López +3
The inflated radii observed in hundreds of Hot Jupiters represent a long-standing open issue. The observed correlation between radii and irradiation strength, and the occasional ex…
Far beyond the Sun: II. Probing the stellar magnetism of the young Sun ι Horologii from the photosphere to its corona
E. M. Amazo-Gómez, J. D. Alvarado-Gómez, K. Poppenhaeger +14
A comprehensive multi-wavelength campaign has been carried out to probe stellar activity and variability in the young Sun-like star -Horologii. We present the results from long-…
Predicting Stellar Rotation Periods Using XGBoost
Nuno R. C. Gomes, Fabio Del Sordo, Luís Torgo
This work aims to develop a computationally inexpensive approach, based on machine learning techniques, to accurately predict thousands of stellar rotation periods. The innovation…
Vorticity and magnetic dynamo from subsonic expansion waves
Albert Elias-López, Fabio Del Sordo, Daniele Viganò
This work concentrates on the effect of an irrotational forcing on a magnetized flow in the presence of rotation, baroclinicity, shear, or a combination of them. By including magne…
A closer look at supernovae as seeds for galactic magnetization
Evangelia Ntormousi, Fabio Del Sordo, Matteo Cantiello +1
Explaining the currently observed magnetic fields in galaxies requires relatively strong seeding in the early Universe. One theory proposes that magnetic fields of the order of …
Global simulations of Tayler instability in stellar interiors: a long-time multi-stage evolution of the magnetic field
G. Monteiro, G. Guerrero, F. Del Sordo +2
Magnetic fields have been observed in massive Ap/Bp stars and presumably are also present in the radiative zone of solar-like stars. Yet, to date there is no clear understanding of…
Detailed stellar activity analysis and modelling of GJ 832: Reassessment of the putative habitable zone planet GJ 832c
P. Gorrini, N. Astudillo-Defru, S. Dreizler +27
Context. Gliese 832 (GJ 832) is an M2V star hosting a massive planet on a decade-long orbit, GJ 832b, discovered by radial velocity (RV). Later, a super Earth or mini-Neptune orbit…
Proxima Centauri reloaded: Unravelling the stellar noise in radial velocities
M. Damasso, F. Del Sordo
The detection and characterisation of Earth-like planets with Doppler signals of the order of 1 m/s currently represent one of the greatest challenge for extrasolar-planet hunters.…
Exoplanetary Detection By Multifractal Spectral Analysis
Sahil Agarwal, Fabio Del Sordo, John S. Wettlaufer
Owing to technological advances, the number of exoplanets discovered has risen dramatically in the last few years. However, when trying to observe Earth analogs, it is often diffic…
Turbulent dynamo with advective magnetic helicity flux
Fabio Del Sordo, Gustavo Guerrero, Axel Brandenburg
Many astrophysical bodies harbor magnetic fields that are thought to be sustained by a dynamo process. However, it has been argued that the production of large-scale magnetic field…
Breakdown of chiral symmetry during saturation of the Tayler instability
Alfio Bonanno, Axel Brandenburg, Fabio Del Sordo +1
We study spontaneous breakdown of chiral symmetry during the nonlinear evolution of the Tayler instability. We start with an initial steady state of zero helicity. Within linearize…
Vorticity production and survival in viscous and magnetized cosmologies
F. Dosopoulou, F. Del Sordo, C. G. Tsagas +1
We study the role of viscosity and the effects of a magnetic field on a rotating, self-gravitating fluid, using Newtonian theory and adopting the ideal magnetohydrodynamic approxim…
Spontaneous chiral symmetry breaking in the Tayler instability
Fabio Del Sordo, Alfio Bonanno, Axel Brandenburg +1
The chiral symmetry breaking properties of the Tayler instability are discussed. Effective amplitude equations are determined in one case. This model has three free parameters that…
Mean-field diffusivities in passive scalar and magnetic transport in irrotational flows
Karl-Heinz Rädler, Axel Brandenburg, Fabio Del Sordo +1
Certain aspects of the mean-field theory of turbulent passive scalar transport and of mean-field electrodynamics are considered with particular emphasis on aspects of compressible…
Decay of trefoil and other magnetic knots
Simon Candelaresi, Fabio Del Sordo, Axel Brandenburg
Two setups with interlocked magnetic flux tubes are used to study the evolution of magnetic energy and helicity on magnetohydrodynamical (MHD) systems like plasmas. In one setup th…
Turbulence and magnetic spots at the surface of hot massive stars
Matteo Cantiello, Jonathan Braithwaite, Axel Brandenburg +3
Hot luminous stars show a variety of phenomena in their photospheres and in their winds which still lack clear physical explanations at this time. Among these phenomena are non-the…
3D MHD simulations of subsurface convection in OB stars
Matteo Cantiello, Jonathan Braithwaite, Axel Brandenburg +3
During their main sequence evolution, massive stars can develop convective regions very close to their surface. These regions are caused by an opacity peak associated with iron ion…
Vorticity from irrotationally forced flow
Fabio Del Sordo, Axel Brandenburg
In the interstellar medium the turbulence is believed to be forced mostly through supernova explosions. In a first approximation these flows can be written as a gradient of a poten…
Vorticity production through rotation, shear and baroclinicity
Fabio Del Sordo, Axel Brandenburg
In the absence of rotation and shear, and under the assumption of constant temperature or specific entropy, purely potential forcing by localized expansion waves is known to produc…
Influence of Magnetic Helicity in MHD
Simon Candelaresi, Fabio Del Sordo, Axel Brandenburg
Observations have shown that the Sun's magnetic field has helical structures. The helicity content in magnetic field configurations is a crucial constraint on the dynamical evoluti…
Turbulent transport in hydromagnetic flows
A. Brandenburg, P. Chatterjee, F. Del Sordo +3
The predictive power of mean-field theory is emphasized by comparing theory with simulations under controlled conditions. The recently developed test-field method is used to extrac…