Publications (32)
EWOCS-IV: 1Ms ACIS Chandra observation of the supergiant B[e] star Wd1-9
K. Anastasopoulou, M. G. Guarcello, J. J. Drake +21
Supergiant B[e] (sgB[e]) stars are exceptionally rare objects, with only a handful of confirmed examples in the Milky Way. The evolutionary pathways leading to the sgB[e] phase rem…
Energy-dependent SEP Fe/O abundances during the May 2024 superstorm
G. D. Muro, C. M. S. Cohen, Z. Xu +16
During mid-May 2024, active region (AR) 13664 produced a series of M- and X-class flares along with several coronal mass ejections (CMEs) that resulted in exceptionally strong auro…
Ultra-High-Energy Cosmic Rays from the Radio Lobes of AGNs
F. Fraschetti, F. Melia
In the past year, the HiRes and Auger collaborations have reported the discovery of a high-energy cutoff in the ultra-high energy cosmic-ray (UHECR) spectrum, and an apparent clust…
Relative space-time transformations in GRBs
R. Ruffini, C. L. Bianco, P. Chardonnet +2
The GRB 991216 and its relevant data acquired from the BATSE experiment and RXTE and Chandra satellites are used as a prototypical case to test the theory linking the origin of gam…
Observational signatures of an electromagnetic overcritical gravitational collapse
R. Ruffini, F. Fraschetti, L. Vitagliano +1
We present theoretical predictions for the spectral, temporal and intensity signatures of the electromagnetic radiation emitted during the process of the gravitational collapse of…
On a possible GRB-supernova time sequence
R. Ruffini, C. L. Bianco, P. Chardonnet +2
The data from the Chandra satellite on the iron emission lines in the afterglow of GRB 991216 are used to give further support for the EMBH theory, which links the origin of the en…
The XMM-Newton Serendipitous Survey. V. The Second XMM-Newton Serendipitous Source Catalogue
M. G. Watson, A. C. Schröder, D. Fyfe +47
Aims: Pointed observations with XMM-Newton provide the basis for creating catalogues of X-ray sources detected serendipitously in each field. This paper describes the creation and…
On the structure of the burst and afterglow of Gamma-Ray Bursts I: the radial approximation
R. Ruffini, C. L. Bianco, P. Chardonnet +2
We have proposed three paradigms for the theoretical interpretation of gamma-ray bursts (GRBs). (1) The relative space-time transformation (RSTT) paradigm emphasizes how the knowle…
On the physical processes which lie at the bases of time variability of GRBs
R. Ruffini, C. L. Bianco, P. Chardonnet +2
The relative-space-time-transformation (RSTT) paradigm and the interpretation of the burst-structure (IBS) paradigm are applied to probe the origin of the time variability of GRBs.…
Radial dependence of ion fluences in the 2023 July 17 SEP event from Parker Solar Probe to STEREO and ACE
G. D. Muro, C. M. S Cohen, Z. Xu +18
In the latter moments of 17 July 2023, the solar active region 13363, near the southwestern face of the Sun, was undergoing considerable evolution, which resulted in a significant…
On the structures in the afterglow peak emission of gamma ray bursts
R. Ruffini, C. L. Bianco, P. Chardonnet +2
Using GRB 991216 as a prototype, it is shown that the intensity substructures observed in what is generally called the "prompt emission" in gamma ray bursts (GRBs) do originate in…
Stellar energetic particles in the magnetically turbulent habitable zones of TRAPPIST-1-like planetary systems
F. Fraschetti, J. J. Drake, J. D. Alvarado-Gomez +3
Planets in close proximity to their parent star, such as those in the habitable zones around M dwarfs, could be subject to particularly high doses of particle radiation. We have ca…
Time-dependent perpendicular transport of fast charged particles in a turbulent magnetic field
F. Fraschetti, J. R. Jokipii
We present an analytic derivation of the temporal dependence of the perpendicular transport coefficient of charged particles in magnetostatic turbulence, for times smaller than the…
Reconstructing Extreme Space Weather from Planet Hosting Stars
V. S. Airapetian, V. Adibekyan, M. Ansdell +80
The field of exoplanetary science is making rapid progress both in statistical studies of exoplanet properties as well as in individual characterization. As space missions provide…
Cross-field transport in Goldreich-Sridhar MHD turbulence
F. Fraschetti
I derive analytically the temporal dependence of the perpendicular transport coefficient of a charged particle in the three-dimensional anisotropic turbulence conjectured by Goldre…
New perspectives in physics and astrophysics from the theoretical understanding of Gamma-Ray Bursts
R. Ruffini, C. L. Bianco, P. Chardonnet +3
If due attention is given in formulating the basic equations for the Gamma-Ray Burst (GRB) phenomenon and in performing the corresponding quantitative analysis, GRBs open a main av…
Stellar Energetic Particle Transport in the Turbulent and CME-disrupted Stellar Wind of AU~Microscopii
F. Fraschetti, J. D. Alvarado-Gómez, J. J. Drake +2
Energetic particles emitted by active stars are likely to propagate in astrospheric magnetized plasma turbulent and disrupted by the prior passage of energetic Coronal Mass Ejectio…
The Space Environment and Atmospheric Joule Heating of the Habitable Zone Exoplanet TOI700-d
O. Cohen, C. Garraffo, S. Moschou +4
We investigate the space environment conditions near the Earth-size planet TOI~700~d using a set of numerical models for the stellar corona and wind, the planetary magnetosphere, a…
UHECRs from the Radio Lobes of AGNs
F. Fraschetti, F. Melia
We report a stochastic mechanism of particle acceleration from first principles in an environment having properties like those of Radio Lobes in AGNs. We show that energies $\sim 1…
On the instantaneous spectrum of Gamma-Ray Bursts
R. Ruffini, C. L. Bianco, P. Chardonnet +3
A theoretical attempt to identify the physical process responsible for the afterglow emission of Gamma-Ray Bursts (GRBs) is presented, leading to the occurrence of thermal emission…
Primordial non-Gaussianity in density fluctuations
F. Fraschetti, J. M. Alimi, J. Courtin +1
We present N-body cosmological numerical simulations including a primordial non-Gaussianity in the density fluctuation field quantified by the non-linear parameter . We hav…
GRB 970228 Within the EMBH Model
A. Corsi, M. G. Bernardini, C. L. Bianco +4
We consider the gamma-ray burst of 1997 February 28 (GRB 970228) within the ElectroMagnetic Black Hole (EMBH) model. We first determine the value of the two free parameters that ch…
Possible role of magnetic reconnection in the electromagnetic counterpart of binary black hole merger
F. Fraschetti
We propose a qualitative scenario to interpret the argued association between the direct measurement of the gravitational wave event GW150914 by Laser Interferometer Gravitational…
A New Astrophysical "Triptych": GRB030329/SN2003dh/URCA-2
M. G. Bernardini, C. L. Bianco, P. Chardonnet +3
We analyze the data of the Gamma-Ray Burst/Supernova GRB030329/SN2003dh system obtained by HETE-2 (GCN [1]), R-XTE (GCN [2]), XMM (Tiengo et al. [3]) and VLT (Hjorth et al. [4]) wi…
Vortical amplification of magnetic field at inward shock of supernova remnant Cassiopeia A
F. Fraschetti, S. Katsuda, T. Sato +2
We present an interpretation of the time variability of the -ray flux recently reported from a multi-epoch campaign of years observations of the supernova remnant Cassiopei…
On the interpretation of the burst structure of GRBs
R. Ruffini, C. L. Bianco, P. Chardonnet +2
Given the very accurate data from the BATSE experiment and RXTE and Chandra satellites, we use the GRB 991216 as a prototypical case to test the EMBH theory linking the origin of t…
Vortical field amplification and particle acceleration at rippled shocks
F. Fraschetti
Supernova Remnants (SNRs) shocks are believed to accelerate charged particles and to generate strong turbulence in the post-shock flow. From high-energy observations in the past de…
Space Weather-driven Variations in Ly Absorption Signatures of Exoplanet Atmospheric Escape: MHD Simulations and the Case of AU Mic b
O. Cohen, J. D. Alvarado-Gomez, J. J. Drake +3
We simulate the space environment around AU Microscopii b and the interaction between the magnetized stellar wind with a planetary atmospheric outflow for ambient stellar wind cond…
Cross-field transport and pitch-angle anisotropy of solar energetic particles in MHD turbulence
F. Fraschetti
Recent modelling of solar energetic particles (SEPs) propagation through the heliospheric turbulence, also discussed in this workshop, has investigated the role of the pitch-angle…
The EMBH model in GRB 991216 and GRB 980425
R. Ruffini, C. L. Bianco, P. Chardonnet +2
This is a summary of the two talks presented at the Rome GRB meeting by C.L. Bianco and R. Ruffini. It is shown that by respecting the Relative Space-Time Transformation (RSTT) par…
The GRB980425-SN1998bw Association in the EMBH Model
F. Fraschetti, M. G. Bernardini, C. L. Bianco +3
Our GRB theory, previously developed using GRB 991216 as a prototype, is here applied to GRB 980425. We fit the luminosity observed in the 40--700 keV, 2--26 keV and 2--10 keV band…
Photon and neutrino emission from active galactic nuclei
P. L. Biermann, J. K. Becker, L. I. Caramete +4
Supermassive black holes in the centers of galaxies are very common. They are known to rotate, accrete, spin down and eject highly relativistic jets; those jets pointed at us all s…