38 citations · 368 across the 34 of their papers we have counts for
35 papers
Double White Dwarf Mergers as Progenitors of Long-Period Transients
Manuel Malheiro, Sarah V. Borges, Jaziel G. Coelho +6
There is an ongoing discussion in the literature on the nature of long-period transients (LPTs), radio-emitting sources with periods ranging from hundreds to tens of thousands of s…
Binary coalescences as sources of Ultra-High Energy Cosmic Rays
Jonas P. Pereira, Carlos H. Coimbra-Araújo, Rita C. dos Anjos +1
Binary coalescences are known sources of gravitational waves (GWs) and they encompass combinations of black holes (BHs) and neutron stars (NSs). Here we show that when BHs are embe…
Evidence for 3XMM J185246.6+003317 as a massive magnetar with a low magnetic field
Rafael C. R. de Lima, Jonas P. Pereira, Jaziel G. Coelho +10
3XMM J185246.6+003317 is a transient magnetar located in the vicinity of the supernova remnant Kes\,79. So far, observations have only set upper limits to its surface magnetic fiel…
The double white dwarf merger progenitors of SDSS J2211+1136 and ZTF J1901+1458
M. F. Sousa, J. G. Coelho, J. C. N. de Araujo +2
Double white dwarf (DWD) mergers are possibly the leading formation channel of massive, rapidly rotating, high-field magnetic white dwarfs (HFMWDs). However, the direct link connec…
Orbital decay of double white dwarfs: beyond gravitational wave radiation effects
G. A. Carvalho, R. C. dos Anjos, J. G. Coelho +6
The traditional description of the orbital evolution of compact-object binaries, like double white dwarfs (DWDs), assumes that the system is driven only by gravitational wave (GW)…
An updated view and perspectives on high-energy gamma-ray emission from SGR J1935+2154 and its environment
Jaziel G. Coelho, Luana N. Padilha, Rita C. dos Anjos +2
SGR J1935+2154 was discovered in 2016 and is currently one of the most burst-active Soft Gamma-ray Repeaters (SGR), having emitted several X-ray bursts in recent years. In one of o…
Gravitational Wave Emission by Accretion of Matter and Magnetic Deformation in Fast Rotating White Dwarfs
Manoel F. Sousa, José C. N. de Araujo, Jaziel G. Coelho
We discuss some aspects of Sousa et al.(2020a, 2020b) concerning two mechanisms of gravitational wave (GW) emission in fast-spinning white dwarfs (WDs): accretion of matter and mag…
Origin and role of relativistic cosmic particles
A. Araudo, G. Morlino, B. Olmi +121
This white paper briefly summarizes the importance of the study of relativistic cosmic rays, both as a constituent of our Universe, and through their impact on stellar and galactic…
Probing extreme environments with the Cherenkov Telescope Array
C. Boisson, A. M. Brown, A. Burtovoi +127
The physics of the non-thermal Universe provides information on the acceleration mechanisms in extreme environments, such as black holes and relativistic jets, neutron stars, super…
Multi-messenger and transient astrophysics with the Cherenkov Telescope Array
Ž. Bošnjak, A. M. Brown, A. Carosi +142
The discovery of gravitational waves, high-energy neutrinos or the very-high-energy counterpart of gamma-ray bursts has revolutionized the high-energy and transient astrophysics co…
High-energy gamma-ray emission from SNR G57.2+0.8 hosting SGR J1935+2154
Rita C. dos Anjos, Jaziel G. Coelho, Jonas P. Pereira +1
In recent years some efforts have been made to identify active sources capable of accelerating particles up to eV, known as PeVatrons. Measurements of TeV ( eV)…
Observational Constraints on the Pulsar Wind Model: The Cases of Crab and Vela
Jaziel G. Coelho, José C. N. de Araujo, Samantha M. Ladislau +1
As is well known, pulsars are extremely stable rotators. However, although slowly, they spin down thanks to brake mechanisms, which are in fact still subject of intense investigati…
Mass limits of the extremely fast-spinning white dwarf CTCV J2056-3014
Edson Otoniel, Jaziel G. Coelho, Sílvia P. Nunes +2
CTCV J2056--3014 is a nearby cataclysmic variable with an orbital period of approximately hours at a distance of about light-years from the Earth. Its recently reporte…
Weighing massive neutron star with screening gravity: A look on PSR J0740+6620 and GW190814 secondary component
Rafael C. Nunes, Jaziel G. Coelho, José C. N. de Araujo
Neutron stars (NSs) are excellent natural laboratories to constrain gravity on strong field regime and nuclear matter in extreme conditions. Motivated by the recent discovery of a…
A magnetic white-dwarf accretion model for the anomalous X-ray pulsar 4U 0142+61
Sarah V. Borges, Claudia V. Rodrigues, Jaziel G. Coelho +2
The quiescent emission of the anomalous X-ray pulsar (AXP) 4U 0142+61 extends over a broad range of energy, from radio up to hard X-rays. In particular, this object is unique among…
Gravitational waves from fast-spinning white dwarfs
Manoel F. Sousa, Jaziel G. Coelho, José C. N. de Araujo
Two mechanisms of gravitational waves (GWs) emission in fast-spinning white dwarfs (WDs) are investigated: accretion of matter and magnetic deformation. In both cases, the GW emiss…
Evidence for a multipolar magnetic field in SGR J1745-2900 from X-ray light-curve analysis
Rafael C. R. de Lima, Jaziel G. Coelho, Jonas P. Pereira +2
SGR J1745-2900 was detected from its outburst activity in April 2013 and it was the first soft gamma repeater (SGR) detected near the center of the Galaxy (Sagittarius A). We u…
Gravitational waves from SGRs and AXPs as fast-spinning white dwarfs
Manoel F. Sousa, Jaziel G. Coelho, José C. N. de Araujo
Gravitational waves (GWs) emission due to magnetic deformation mechanism is applied for Soft Gamma Repeaters (SGRs) and Anomalous X-Ray Pulsars(AXPs), described as fast-spinning an…
Gravitational Waves From Pulsars Due To Their Magnetic Ellipticity
José C. N. de Araujo, Jaziel G. Coelho, Samantha M. Ladislau +1
We discuss some aspects of de Araujo, Coelho & Costa (2016, 2017) concerning the role of a time dependent magnetic ellipticity on the pulsars' braking indices and on the putative g…
Born-Infeld magnetars: larger production of gravitational waves due to larger toroidal magnetic fields
Jonas P. Pereira, Jaziel G. Coelho, Rafael C. R. de Lima
We discuss some aspects of Pereira et al. (2018) concerning magnetars described by nonlinear theories of the electromagnetism and make the case for the Born-Infeld Lagrangian. We f…
Born-Infeld magnetars: larger than classical toroidal magnetic fields and implications for gravitational-wave astronomy
Jonas P. Pereira, Jaziel G. Coelho, Rafael C. R. de Lima
Magnetars are neutron stars presenting bursts and outbursts of X- and soft-gamma rays that can be understood with the presence of very large magnetic fields. Thus, nonlinear electr…
Ultra-high energy cosmic rays from white dwarf pulsars and the Hillas criterion
Ronaldo V. Lobato, Jaziel G. Coelho, M. Malheiro
The sources of ultra-high-energy cosmic rays ( eV) is still an open question in astroparticle physics and in the last years some efforts were made to understand it…
On the nature of some SGRs and AXPs as rotation-powered neutron stars
Jaziel G. Coelho, D. L. Cáceres, R. C. R. de Lima +3
We investigate the possibility that some SGRs/AXPs could be canonical rotation-powered pulsars using realistic NS structure parameters instead of fiducial values. We show that real…
Thermal X-ray emission from massive, fast rotating, highly magnetized white dwarfs
D. L. Caceres, S. M. de Carvalho, J. G. Coelho +2
There is solid observational evidence on the existence of massive, , highly magnetized white dwarfs (WDs) with surface magnetic fields up to G. We sho…