POINT SOURCE POLARIMETRY with the GEMINI PLANET IMAGER: SENSITIVITY CHARACTERIZATION with T5.5 DWARF COMPANION HD 19467 B

Rebecca Jensen-Clem, Max Millar-Blanchaer, Dimitri Mawet, James R. Graham, J. Kent Wallace, Bruce Macintosh, Sasha Hinkley, Sloane J. Wiktorowicz, Marshall D. Perrin, Mark S. Marley, Michael P. Fitzgerald, Rebecca Oppenheimer, S. Mark Ammons, Fredrik T. Rantakyrö, Franck Marchis

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

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% ≤ 2.4%. We discuss our results in the context of T dwarf cloud models and photometric variability.

Original languageEnglish (US)
Article number111
JournalAstrophysical Journal
Volume820
Issue number2
DOIs
StatePublished - Apr 1 2016
Externally publishedYes

Keywords

  • brown dwarfs
  • stars: individual (HD 19467)
  • techniques: high angular resolution
  • techniques: polarimetric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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