78 citations · 503 across the 11 of their papers we have counts for
11 papers
3D MHD modeling of the expanding remnant of SN 1987A. Role of magnetic field and non-thermal radio emission
S. Orlando, M. Miceli, O. Petruk +8
Aims. We investigate the role played by a pre-supernova (SN) ambient magnetic field on the dynamics of the expanding remnant of SN 1987A and the origin and evolution of the radio e…
Hydrodynamic Modeling of Accretion Impacts in Classical T Tauri Stars: Radiative Heating of the Pre-shock Plasma
G. Costa, S. Orlando, G. Peres +2
Context. It is generally accepted that, in Classical T Tauri Stars, the plasma from the circumstellar disc accretes onto the stellar surface with free fall velocity, and the impact…
Magnetohydrodynamic modeling of the accretion shocks in classical T Tauri stars: the role of local absorption on the X-ray emission
R. Bonito, S. Orlando, C. Argiroffi +5
We investigate the properties of X-ray emission from accretion shocks in classical T Tauri stars (CTTSs), generated where the infalling material impacts the stellar surface. Both o…
Radiative accretion shocks along nonuniform stellar magnetic fields in classical T Tauri stars
S. Orlando, R. Bonito, C. Argiroffi +9
(abridged) AIMS. We investigate the dynamics and stability of post-shock plasma streaming along nonuniform stellar magnetic fields at the impact region of accretion columns. We stu…
YSO accretion shocks: magnetic, chromospheric or stochastic flow effects can suppress fluctuations of X-ray emission
T. Matsakos, J. -P. Chièze, C. Stehlé +9
Context. Theoretical arguments and numerical simulations of radiative shocks produced by the impact of the accreting gas onto young stars predict quasi-periodic oscillations in the…
On the observability of T Tauri accretion shocks in the X-ray band
G. G. Sacco, S. Orlando, C. Argiroffi +4
Context. High resolution X-ray observations of classical T Tauri stars (CTTSs) show a soft X-ray excess due to high density plasma (n_e=10^11-10^13 cm^-3). This emission has been a…
Generation of radiative knots in a randomly pulsed protostellar jet II. X-ray emission
R. Bonito, S. Orlando, M. Miceli +3
Protostellar jets are known to emit in a wide range of bands, from radio to IR to optical bands, and to date also about ten X-ray emitting jets have been detected, with a rate of d…
X-ray emitting MHD accretion shocks in classical T Tauri stars. Case for moderate to high plasma-beta values
S. Orlando, G. G. Sacco, C. Argiroffi +3
AIMS. We investigate the stability and dynamics of accretion shocks in CTTSs, considering the case of beta >= 1 in the post-shock region. In these cases the 1D approximation is not…
A coronal explosion on the flare star CN Leonis
J. H. M. M. Schmitt, F. Reale, C. Liefke +4
We present simultaneous high-temporal and high-spectral resolution observations at optical and soft X-ray wavelengths of the nearby flare star CN Leo. During our observing campaign…
The discovery of an expanding X-ray source in the HH 154 protostellar jet
F. Favata, R. Bonito, G. Micela +4
We have performed, in October 2005, a deep Chandra X-ray observation of HH 154. Comparison with the previous (2001) Chandra observation allows to detect proper motion down to the l…
The Ultra-luminous M81 X-9 source: 20 years variability and spectral states
V. La Parola, G. Peres, G. Fabbiano +2
The source X-9 was discovered with the {\it Einstein Observatory} in the field of M81, and is located in the dwarf galaxy Holmberg IX. X-9 has a 0.2-4.0 keV luminosity of $\sim 5.5…