Browsing by Author "Cotton, Daniel V."

Now showing items 1-5 of 5

    • 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 ...