The polarisation of HD 189733

Abstract

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 than any previously reported for this object. They do not show the large amplitude polarization variations reported by Berdyugina et al. 2008 and Berdyugina et al. 2011. Our results are consistent with polarization data presented by Wiktorowicz et al. 2015. A formal least squares fit of a Rayleigh-Lambert model yields a polarization amplitude of 29.4 +/- 15.6 parts-per-million. We observe a background constant level of polarization of ~ 55-70 ppm, which is a little higher than expected for interstellar polarization at the distance of HD 189733.

5 pages, 1 figure, 4 tables, accepted for publication in MNRAS

References in corpus (22)

• Improved parameters for extrasolar transiting planets
• Detection of atmospheric haze on an extrasolar planet: The 0.55 - 1.05 micron transmission spectrum of HD189733b with the Hubble Space Telescope
• ELODIE metallicity-biased search for transiting Hot Jupiters II. A very hot Jupiter transiting the bright K star HD189733
• Spin-orbit angle measurements for six southern transiting planets; New insights into the dynamical origins of hot Jupiters
• The prevalence of dust on the exoplanet HD 189733b from Hubble and Spitzer observations
• Photometric Light Curves and Polarization of Close-in Extrasolar Giant Planets
• The Rossiter-McLaughlin effect of CoRoT-3b & HD189733b
• The Deep Blue Color of HD189733b: Albedo Measurements with Hubble Space Telescope/Space Telescope Imaging Spectrograph at Visible Wavelengths
• Spectropolarimetric observations of the transiting planetary system of the K dwarf HD 189733
• Polarized reflected light from the exoplanet HD189733b: First multicolor observations and confirmation of detection
• First detection of polarized scattered light from an exoplanetary atmosphere
• A high-sensitivity polarimeter using a ferro-electric liquid crystal modulator
• A grid of polarization models for Rayleigh scattering planetary atmospheres
• The linear polarization of nearby bright stars measured at the parts per million level
• Non-Detection of Polarized, Scattered Light from the HD 189733b Hot Jupiter
• A Ground-Based Albedo Upper Limit for HD 189733b from Polarimetry
• Planetpol polarimetry of the exoplanet systems 55 Cnc and tau Boo
• The linear polarisation of southern bright stars measured at the parts-per-million level
• A High Precision, Optical Polarimeter to Measure Inclinations of High Mass X-Ray Binaries
• Molecules as magnetic probes of starspots
• Simultaneous Linear and Circular Optical Polarimetry of Asteroid (4) Vesta
• Polarization in exoplanetary systems caused by transits, grazing transits, and starspots

Cited by in corpus (29)

• Exoplanet Biosignatures: Observational Prospects
• Aerosols in Exoplanet Atmospheres
• Polarized scattered light from self-luminous exoplanets. Three-dimensional scattering radiative transfer with ARTES
• Polarization measurements of hot dust stars and the local interstellar medium
• MOVES I. The evolving magnetic field of the planet-hosting star HD189733
• HIPPI-2: A Versatile High Precision Polarimeter
• Polarized Radiative Transfer in Planetary Atmospheres and the Polarization of Exoplanets
• A high precision polarimeter for small telescopes
• The O2 A-band in fluxes and polarization of starlight reflected by Earth-like exoplanets
• Using polarimetry to retrieve the cloud coverage of Earth-like exoplanets
• The polarization of the planet-hosting WASP-18 system
• A survey of exoplanet phase curves with Ariel
• Detecting Magnetic Fields in Exoplanets with Spectropolarimetry of the Helium Line at 1083 nm
• The Rotationally Modulated Polarization of $\xi$ Boo A
• Polarization of hot Jupiter systems: a likely detection of stellar activity and a possible detection of planetary polarization
• Polarimetric and radiative transfer modelling of HD 172555
• Traces of exomoons in computed flux and polarization phase curves of starlight reflected by exoplanets
• On mapping exoplanet atmospheres with high-dispersion spectro-polarimetry. Some model predictions
• Polarimetric investigation of selected cloud compositions in exoplanetary atmospheres
• Polarimetric Detection of Exoplanets Transiting T- and L- Brown Dwarfs
• A Decade of Linear and Circular Polarimetry with the POLISH2 Polarimeter
• Computation of the transmitted and polarized scattered fluxes by the exoplanet HD 189733b in X-rays
• How much large dust could be present in hot exozodiacal dust systems?
• Scattered polarized radiation of extrasolar circumplanetary rings
• Spectropolarimetry as a Means to Address Cloud Composition and Habitability for a Cloudy Exoplanetary Atmosphere in the Habitable Zone
• Illusion and Reality in the Atmospheres of Exoplanets
• Generic Models for Disk-Resolved and Disk-Integrated Phase Dependent Linear Polarization of Light Reflected from Exoplanets
• Polarization position angle standard stars: a reassessment of $\theta$ and its variability for seventeen stars based on a decade of observations
• Impact of hot exozodiacal dust on the polarimetric analysis of close-in exoplanets