Search
Now showing items 1-10 of 184
The linear polarisation of southern bright stars measured at the parts-per-million level
(2016-01-11)
We report observations of the linear polarisation of a sample of 50 nearby southern bright stars measured to a median sensitivity of ~4.4 x 10^{-6}. We find larger polarisations and more highly polarised stars than in the ...
Near-infrared circular polarization survey in star-forming regions : Correlations and trends
(2014-11-01)
We have conducted a systematic near-infrared circular polarization (CP) survey in star-forming regions, covering high-mass, intermediate-mass, and low-mass young stellar objects. All the observations were made using the ...
Nicmos polarimetry of "polar-scattered" seyfert 1 galaxies
(2011-09-01)
The nuclei of Seyfert 1 galaxies exhibit a range of optical polarization characteristics that can be understood in terms of two scattering regions producing orthogonal polarizations: an extended polar scattering region ...
High sensitivity polarimetry : techniques and applications
(Springer Nature, 2010)
High sensitivity polarimetry will refer to fractional polarizations of below, and often significantly below, 103. Measuring low fractional polarization requires a large number of photons and also special techniques are ...
Magnetic field configuration at the galactic center investigated by wide-field near-infrared polarimetry : transition from a toroidal to a poloidal magnetic field
(2010)
We present a large-scale view of the magnetic field (MF) in the central 2° × 2° region of our Galaxy. The polarization of point sources has been measured in the J, H, and KS bands using the near-infrared polarimetric camera ...
Extended High Circular Polarization in the Orion Massive Star Forming Region: Implications for the Origin of Homochirality in the Solar System
(2010)
We present a wide-field (∼6′ × 6′) and deep near-infrared (K s band: 2.14 μm) circular polarization image in the Orion nebula, where massive stars and many low-mass stars are forming. Our results reveal that a high circular ...
The linear polarization of nearby bright stars measured at the parts per million level
(2010)
We report observations of the linear polarization of a sample of 49 nearby bright stars measured to sensitivities of between ∼1 and ∼ 4 × 10−6 . The majority of stars in the sample show measurable polarization, but most ...
Detection of circular polarization in light scattered from photosynthetic microbes
(2009-05)
The identification of a universal biosignature that could be sensed remotely is critical to the prospects for success in the search for life elsewhere in the universe. A candidate universal biosignature is homochirality, ...
Planetpol polarimetry of the exoplanet systems 55 Cnc and tau Boo
(2009)
We present very sensitive polarimetry of 55 Cnc and τ Boo in an attempt to detect the partially polarized reflected light from the planets orbiting these two stars. 55 Cnc is orbited by a hot Neptune planet (55 Cnc e) at ...