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Magnetars and the highly magnetized, fast, very massive, strange white dwarfs pulsars, and the generation of gravitational waves

Grant number: 13/15088-0
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): March 01, 2015
Effective date (End): April 22, 2018
Field of knowledge:Physical Sciences and Mathematics - Astronomy
Principal Investigator:Jose Carlos Neves de Araujo
Grantee:Jaziel Goulart Coelho
Home Institution: Instituto Nacional de Pesquisas Espaciais (INPE). Ministério da Ciência, Tecnologia, Inovações e Comunicações (Brasil). São José dos Campos , SP, Brazil
Associated research grant:13/26258-4 - Superdense matter in the universe, AP.TEM

Abstract

From the point of view of fundamental physics, compact objects are very important, because they have strong gravity, high magnetic fields and huge densities, are perhaps the only way to study physics under extreme conditions. Among these objects, the class named Anomalous X-ray pulsars (AXPs) and Soft gamma-ray repeaters (SGRs) are some of the most interesting groups of pulsars that have been intensively studied in recent years. They are usually seen as neutron stars with super strong magnetic fields, $B\gtrsim10^{14}$ G. However, two SGRs with low magnetic field $B\sim(10^{12}-10^{13})$ G were detected. Besides, white dwarfs pulsars (AB) too have also been observed. These new discoveries have opened the discussion of the nature of SGRs/AXPs, emerging alternative scenarios, in particular, the white dwarf pulsar model, fast and highly magnetized in an attempt to explain the observational characteristics of some SGRs/AXPs. In this new description several observational features are easy understood and well explained as a consequence of the large radius of a massive white dwarf that manifests a new scale of mass density, moment of inertia, rotational energy, and magnetic dipole momentum incomparison with the case of neutron stars. In this project, we will discuss these massive fast rotating highly magnetized white dwarfsas belonging to a new class of very massive white dwarfs with a core of strange quark matter, beyond the investigation of emission of gravitational waves generated by the oscillation during the transition from hadronic matter to quark matter or asymmetries generated by the high magnetic field combined with the effects of rotation of the star. In light of these recent astronomical observations and theoretical models for strange quark matter, this project aims at a better understanding the true nature of SGRs/AXPs: they are really magnetars ormassive, very fast, and strange white dwarfs?

Articles published in Agência FAPESP about the scholarship:
Quantum vacuum may explain slowing of pulsar spin 

Scientific publications (9)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
PEREIRA, JONAS P.; COELHO, JAZIEL G.; DE LIMA, RAFAEL C. R. Born-Infeld magnetars: larger than classical toroidal magnetic fields and implications for gravitational-wave astronomy. EUROPEAN PHYSICAL JOURNAL C, v. 78, n. 5 MAY 8 2018. Web of Science Citations: 0.
DE ARAUJO, JOSE C. N.; COELHO, JAZIEL G.; COSTA, CESAR A. Gravitational waves from pulsars in the context of magnetic ellipticity. EUROPEAN PHYSICAL JOURNAL C, v. 77, n. 5 MAY 26 2017. Web of Science Citations: 1.
CACERES, D. L.; DE CARVALHO, S. M.; COELHO, J. G.; DE LIMA, R. C. R.; RUEDA, JORGE A. Thermal X-ray emission from massive, fast rotating, highly magnetized white dwarfs. Monthly Notices of the Royal Astronomical Society, v. 465, n. 4, p. 4434-4440, MAR 2017. Web of Science Citations: 4.
COELHO, JAZIEL G.; CACERES, D. L.; DE LIMA, R. C. R.; MALHEIRO, M.; RUEDA, J. A.; RUFFINI, R. The rotation-powered nature of some soft gamma-ray repeaters and anomalous X-ray pulsars. Astronomy & Astrophysics, v. 599, MAR 2017. Web of Science Citations: 5.
DE ARAUJO, JOSE C. N.; COELHO, JAZIEL G.; COSTA, CESAR A. GRAVITATIONAL WAVES FROM PULSARS AND THEIR BRAKING INDICES: THE ROLE OF A TIME DEPENDENT MAGNETIC ELLIPTICITY. ASTROPHYSICAL JOURNAL, v. 831, n. 1 NOV 1 2016. Web of Science Citations: 7.
DE ARAUJOA, JOSE C. N.; COELHO, JAZIEL G.; COSTA, CESAR A. Gravitational waves from pulsars with measured braking index. EUROPEAN PHYSICAL JOURNAL C, v. 76, n. 9 AUG 31 2016. Web of Science Citations: 8.
LOBATO, RONALDO V.; MALHEIRO, MANUEL; COELHO, JAZIEL G. Magnetars and white dwarf pulsars. INTERNATIONAL JOURNAL OF MODERN PHYSICS D, v. 25, n. 9, SI AUG 2016. Web of Science Citations: 9.
DE ARAUJO, JOSE C. N.; COELHO, JAZIEL G.; COSTA, CESAR A. Gravitational wave emission by the high braking index pulsar PSR J1640-4631. Journal of Cosmology and Astroparticle Physics, n. 7 JUL 2016. Web of Science Citations: 10.
COELHO, JAZIEL G.; PEREIRA, JONAS P.; DE ARAUJO, JOSE C. N. THE INFLUENCE OF QUANTUM VACUUM FRICTION ON PULSARS. ASTROPHYSICAL JOURNAL, v. 823, n. 2 JUN 1 2016. Web of Science Citations: 12.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.
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