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Browsing University of Hertfordshire by Author "Bott, Kimberly"
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A high-sensitivity polarimeter using a ferro-electric liquid crystal modulator
Bailey, J.; Kedziora-Chudczer, Lucyna; Cotton, Daniel V.; Bott, Kimberly; Hough, J.H.; Lucas, P.W. (2015-05-21)We describe the HIgh Precision Polarimetric Instrument (HIPPI), a polarimeter built at UNSW (The University of New South Wales) Australia and used on the Anglo-Australian Telescope (AAT). HIPPI is an aperture polarimeter ... -
The linear polarisation of southern bright stars measured at the parts-per-million level
Cotton, Daniel V.; Bailey, Jeremy; Kedziora-Chudczer, Lucyna; Bott, Kimberly; Lucas, P.W.; Hough, J.; Marshall, Jonathan P. (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 ... -
The polarisation of HD 189733
Bott, Kimberly; Bailey, Jeremy; Kedziora-Chudczer, Lucyna; Cotton, Daniel V.; Lucas, P. W.; Marshall, Jonathan P.; Hough, J. H. (2016-06-11)We present linear polarization observations of the exoplanet system HD 189733 made with the HIgh Precision Polarimetric Instrument (HIPPI) on the Anglo-Australian Telescope (AAT). The observations have higher precision ... -
Polarization due to rotational distortion in the bright star Regulus
Cotton, Daniel V.; Bailey, Jeremy A.; Howarth, Ian D.; Bott, Kimberly; Kedziora-Chudczer, Lucyna; Lucas, P. W.; Hough, J. H. (2018-10-01)Polarization in stars was first predicted by Chandrasekhar [1] who calculated a substantial linear polarization at the stellar limb for a pure electron-scattering atmosphere. This polarization will average to zero when ... -
Polarization of hot Jupiter systems: a likely detection of stellar activity and a possible detection of planetary polarization
Bailey, Jeremy; Bott, Kimberly; Cotton, Daniel V.; Kedziora-Chudczer, Lucyna; Zhao, Jinglin; Evensberget, Dag; Marshall, Jonathan P.; Wright, Duncan; Lucas, P. W. (2021-04-01)We present high-precision linear polarization observations of four bright hot Jupiter systems ($\tau$ Boo, HD 179949, HD 189733 and 51 Peg) and use the data to search for polarized reflected light from the planets. The ...