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

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 $p_{\text{CL}99.73\%}\le 2.4\%$. We discuss our results in the context of T dwarf cloud models and photometric variability.

14 pages, 3 figures, 2 tables. Accepted to ApJ

References in corpus (15)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• The Gemini Planet Imager: First Light
• Fundamental limitations of high contrast imaging set by small sample statistics
• Strong Brightness Variations Signal Cloudy-to-Clear Transition of Brown Dwarfs
• Polarimetry with the Gemini Planet Imager: Methods, Performance at First Light, and the Circumstellar Ring around HR 4796A
• Spectropolarimetric signatures of Earth-like extrasolar planets
• Gemini Planet Imager Spectroscopy of the HR 8799 planets c and d
• Speckle Suppression Through Dual Imaging Polarimetry, and a Ground-Based Image of the HR 4796A Circumstellar Disk
• Confidence Level and Sensitivity Limits in High Contrast Imaging
• Temperature Fluctuations as a Source of Brown Dwarf Variability
• Gemini Planet Imager Observational Calibrations I: Overview of the GPI Data Reduction Pipeline
• A grid of polarization models for Rayleigh scattering planetary atmospheres
• Jet Properties of GeV-Selected Radio-Loud Narrow-Line Seyfert 1 Galaxies and Possible Connection to Their Disk and Corona
• Direct Spectrum of the Benchmark T dwarf HD 19467 B
• The magnetization degree of the outflow powering the highly-polarized reverse shock emission of GRB 120308A

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• The TRENDS High-Contrast Imaging Survey. VI. Discovery of a Mass, Age, and Metallicity Benchmark Brown Dwarf
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• Calibration of the instrumental polarization effects of SCExAO-CHARIS' spectropolarimetric mode
• Full characterization of the instrumental polarization effects of the spectropolarimetric mode of SCExAO-CHARIS