@MastersThesis{Assis:2016:ExOnMH,
author = "Assis, Adam Smith Gontijo Brito de",
title = "Excita{\c{c}}{\~a}o de ondas MHD atrav{\'e}s da emiss{\~a}o de
ondas gravitacionais produzidas por bin{\'a}rias de estrelas de
n{\^e}utrons",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2016",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2016-02-22",
keywords = "ondas gravitacionais, estrelas de n{\^e}utrons, ondas
magnetohidrodin{\^a}micas, explos{\~o}es de raios gamma, ondas
eletromagn{\'e}ticas, gravitational waves, neutron stars,
magnetohydrodynamic waves, gamma ray bursts, electromagnetic
waves.",
abstract = "A coalesc{\^e}ncia de sistemas de bin{\'a}rias de n{\^e}utrons
(ENs) produz quantidade significativa de ondas gravitacionais
(OGs) e s{\~a}o fontes prop{\'{\i}}cias a serem observadas
pelos detectores avan{\c{c}}ados terrestres (por exemplo,
\emph{Advanced} LIGO), na faixa espectral de 10 Hz a 1 kHz. As
ENs tamb{\'e}m possuem contrapartida observacional, no espectro
eletromagn{\'e}tico, uma vez que est{\~a}o relacionadas com os
eventos de \emph{Gamma-Ray Bursts} (GRBs) de curta
dura{\c{c}}{\~a}o (t<\$\sim\$2s). Explos{\~o}es de
raios-\$\gamma\$ s{\~a}o os eventos mais violentos conhecidos
desde o nascimento do universo, correspondendo a uma luminosidade
de 10\$^{51}\$ - 10\$^{52}\$ erg s\$^{\−1}\$.
Emiss{\~a}o gravitacional, entretanto, ainda n{\~a}o foi
detectada diretamente. A primeira evid{\^e}ncia indireta foi
obtida com a bin{\'a}ria de pulsares PSR 1913+16, descoberta por
Hulse \\& Taylor (1974). Contudo, devido aos intensos campos
magn{\'e}ticos de ENs e, consequentemente, ao plasma fortemente
magnetizado circundante a essas fontes de OGs, os modos
Alfv{\'e}n e magneto-ac{\'u}stico de ondas
magnetohidrodin{\^a}micas (MHD) s{\~a}o excitados pelas
polariza{\c{c}}{\~o}es das OGs, x e +, respectivamente. Por sua
vez, as ondas MHD excitadas interagem com o plasma do sistema,
principalmente, por espalhamento Compton Inverso, que pode levar
{\`a} gera{\c{c}}{\~a}o de harm{\^o}nicos maiores dos modos
originais e se tornarem vis{\'{\i}}veis no dom{\'{\i}}nio
eletromagn{\'e}tico, sugerindo assim um mecanismo alternativo
para detec{\c{c}}{\~a}o indireta de OGs. Este trabalho estuda a
intera{\c{c}}{\~a}o da onda gravitacional com as ondas
Alf{\'e}n e magnetoss{\^o}nicas, durante a fase spiral da
coalesc{\^e}ncia (frequ{\^e}ncia da OG, \$\omega\$g, num
intervalo de [300 - 1500]Hz) de sistemas bin{\'a}rios de estrelas
de n{\^e}utrons. At{\'e} ent{\~a}o, tal acoplamento tinha sido
estudado para um sistema de ENs pr{\'o}ximo ao merger
(\$\omega\$g \$\approx\$ 1.5kHz). Discutimos
diferen{\c{c}}as das abordagens e, em seguida, estimamos a
quantidade de energia transferida entre as ondas, nos permitindo
identificar, num trabalho posterior, se a energia depositada pode
ser um mecanismo alternativo de igni{\c{c}}{\~a}o da Fireball de
GRB. ABSTRACT: The coalescence of binary neutron systems (NSs)
produces a significant amount of gravitational waves (GWs) and are
favourable sources to be observed by the ground advanced detectors
(eg, Advanced LIGO) in the spectral range from 10 Hz - 1 kHz. The
NSs also have observational contrast, the electromagnetic
spectrum, as long as they are related to the events of short
Gamma-Ray Bursts (GRBs) (t<\$\sim\$2s). The GRBs are the most
violent events known since the birth of the universe,
corresponding to a luminosity of 10\$^{51}\$ - 10\$^{52}\$ erg
s\$^{-1}\$. Gravitational emission, however, has not yet been
detected directly. The indirect evidence was first obtained with
the binary pulsar PSR 1913+16, discovered by Hulse \\& Taylor
(1974). However, due to the intense magnetic fields NSs and hence
the strongly magnetized plasma surrounding these sources of GWs,
the Alfv{\'e}n modes and magneto-acoustic magnetohydrodynamic
waves (MHD) are excited by the polarizations of the GWs, x and +,
respectively. The MHD wave excited in turn interacts with the
plasma system, mainly by inverse Compton scattering, which can
lead to the generation of higher harmonics of the original mode
and become visible in the electromagnetic domain, suggesting an
alternative mechanism for indirect detection GWs. This work
studies the interaction of gravitational waves with Alfv{\'e}n
and magneto-sonic waves during the spiral-phase of coalescence
(frequency GW, \$\omega\$g in a range of [300 \− 1500]
Hz) of binary neutron star systems. Until then such engagement had
been studied only for NSs system near the merger (\$\omega\$g
\$\approx\$ 1.5 kHz). We discuss the differences in the
approaches and then estimate the amount of energy transferred
between the waves, allowing us to identify, in a subsequent work,
if the energy deposited can be an alternative mechanism for the
ignition fireball of GRB.",
committee = "Aguiar, Odylio Denys de (presidente) and Miranda, Oswaldo Duarte
(orientador) and Alves, Maria Virg{\'{\i}}nia and Oliveira,
Manuel M{\'a}ximo Bastos Malheiro de",
copyholder = "SID/SCD",
englishtitle = "Excitation of MHD waves by gravitational waves generated by
neutron star binary systems",
language = "pt",
pages = "165",
ibi = "8JMKD3MGP3W34P/3L4RUUL",
url = "http://urlib.net/ibi/8JMKD3MGP3W34P/3L4RUUL",
targetfile = "publicacao.pdf",
urlaccessdate = "27 abr. 2024"
}