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Martin, Máirín; O'Dowda, Brendan; Tongue, Alan; Keane, John B.; Turner, Martyn; Lennon, Sean; Fairbairns, Zoë

doi:10.2307/20626558

Cited by 1 publication

(1 citation statement)

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“…A rotating grain can acquire a magnetic moment thanks to the Barnett effect (see Barnett 1915;Landau & Lifshitz 1969) and the rotation of its charged body (Martin 1972b;Dolginov & Mytrophanov 1976). The Barnett effect, which is shown to be much stronger than the latter, induces a magnetic moment proportional to the grain angular velocity:…”

Section: Larmor Precession Of J Around Bmentioning

confidence: 99%

Grain alignment by radiative torques in special conditions and implications

Hoang¹,

Lazarían²

2013

Monthly Notices of the Royal Astronomical Society

109

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Grain alignment by radiative torques (RATs) has been extensively studied for various environment conditions, including interstellar medium, dense molecular clouds, and accretion disks, thanks to significant progress in observational, theoretical and numerical studies. In this paper, we explore the alignment by RATs and provide quantitative predictions of dust polarization for a set of astrophysical environments that can be tested observationally. We first consider the alignment of grains in the local interstellar medium and compare predictions for linear polarization by aligned grains with recent observational data for nearby stars. We then revisit the problem of grain alignment in accretions disks by taking into account the dependence of RAT alignment efficiency on the anisotropic direction of radiation fields relative to magnetic fields. Moreover, we study the grain alignment in interplanetary medium, including diffuse Zodiacal cloud and cometary comae, and calculate the degree of circular polarization (CP) of scattered light arising from single scattering by aligned grains. We also discuss a new type of grain alignment, namely the alignment with respect to the ambient electric field instead of the alignment with the magnetic field. We show that this type of alignment can allow us to reproduce the systematic features of CP observed across a cometary coma. Our findings suggest that polarized Zodiacal dust emission may be an important polarized foreground component, which should be treated carefully in cosmic microwave background experiments.

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Section: Larmor Precession Of J Around Bmentioning

confidence: 99%