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American Astronomical Society, Astrophysical Journal, 2(820), p. 111, 2016

DOI: 10.3847/0004-637x/820/2/111

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Point Source Polarimetry With the Gemini Planet Imager: Sensitivity Characterization With T5.5 Dwarf Companion Hd 19467 B

Journal article published in 2016 by Fredrik T. Rantakyro, R. {Jensen-Clem}, M. {Millar-Blanchaer}, D. and {Graham} J.~R {Mawet}, J.~K {Wallace}, B. and {Hinkley} S {Macintosh}, S.~J {Wiktorowicz}, M.~D and {Marley} M.~S {Perrin}, M.~P {Fitzgerald}, R. and {Ammons} S.~M {Oppenheimer}, F.~T {Rantakyro}, F. {Marchis}, Rebecca Jensen-Clem, Max Millar-Blanchaer ORCID, Dimitri Mawet ORCID and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Detecting polarized light from self-luminous exoplanets has the potential to provide key information about rotation, surface gravity, cloud grain size, and cloud coverage. While field brown dwarfs with detected polarized emission are common, no exoplanet or substellar companion has yet been detected in polarized light. With the advent of high contrast imaging spectro-polarimeters such as GPI and SPHERE, such a detection may now be possible with careful treatment of instrumental polarization. In this paper, we present 28 minutes of H-band GPI polarimetric observations of the benchmark T5.5 companion HD 19467 B. We detect no polarization signal from the target, and place an upper limit on the degree of linear polarization of pCL99:73% less than 1:7%. We discuss our results in the context of T dwarf cloud models and photometric variability.