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A Search for Polarized Thermal Emission from Directly Imaged Exoplanets and Brown Dwarf Companions to Nearby Stars

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dc.contributor.author Jensen-Clem, R
dc.contributor.author Millar-Blanchaer, M. A
dc.contributor.author van Holstein, R. G
dc.contributor.author Mawet, Dimitri
dc.contributor.author Graham, J
dc.contributor.author Sengupta, S
dc.contributor.author Marley, M. S
dc.contributor.author Snik, Frans
dc.contributor.author Vigan, A
dc.contributor.author Hinkley, S
dc.contributor.author de Boer, Jos
dc.contributor.author Girard, J. H
dc.contributor.author De Rosa, R. J
dc.contributor.author Bowler, B. P
dc.contributor.author Wiktorowicz, S. J
dc.contributor.author Perrin, M. D
dc.contributor.author Crepp, J. R
dc.contributor.author Macintosh, B
dc.date.accessioned 2021-02-14T06:38:54Z
dc.date.available 2021-02-14T06:38:54Z
dc.date.issued 2020-12
dc.identifier.citation The Astronomical Journal, Vol. 160, No, 6, 286 en_US
dc.identifier.issn 1538-3881
dc.identifier.uri http://hdl.handle.net/2248/7650
dc.description Restricted Access © IOP Publishing https://doi.org/10.3847/1538-3881/abc33d en_US
dc.description.abstract Aerosols in the atmospheres of cloudy gas giant exoplanets and brown dwarfs scatter and polarize these objects' thermal emission. If such an object has an oblate shape or nonuniform cloud distribution, the net degree of linear polarization can show an increase ranging from several tenths of a percent to a few percent. Modern high-contrast imaging polarimeters are now poised to detect such low-polarization signals, opening up a new window into the rotational velocities and cloud properties of substellar companions to nearby stars. In this paper, we present the results of a near-IR survey searching for linearly polarized thermal emission from a sample of two planetary-mass companions and five brown dwarf companions using GPI and SPHERE-IRDIS. We probe the subpercent linear polarization regime that typifies polarized free-floating brown dwarfs and place limits on each object's degree of linear polarization. We relate our upper limits on each target's degree of linear polarization to its rotation rate, and place our results in the context of rotation rates measured using high-resolution spectroscopy. en_US
dc.language.iso en en_US
dc.publisher IOP Publishing en_US
dc.subject Brown dwarfs en_US
dc.subject Polarimetry en_US
dc.subject Exoplanets en_US
dc.subject Exoplanet atmospheres en_US
dc.title A Search for Polarized Thermal Emission from Directly Imaged Exoplanets and Brown Dwarf Companions to Nearby Stars en_US
dc.type Article en_US

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