Multiband Polarimetric Imaging of HR 4796A with the Gemini Planet Imager

Arriaga, Pauline; Fitzgerald, Michael P.; Duchêne, Gaspard; Kalas, Paul; Millar-Blanchaer, Maxwell A.; Perrin, Marshall D.; Chen, Christine H.; Mazoyer, Johan; Ammons, Mark; Bailey, Vanessa P.; Barman, Trafis S.; Bulger, Joanna; Chilcote, Jeffrey K.; Cotten, Tara; De Rosa, Robert J.; Doyon, Rene; Esposito, Thomas M.; Follette, Katherine B.; Gerard, Benjamin L.; Goodsell, Stephen; Graham, James R.; Greenbaum, Alexandra Z.; Hibon, Pascale; Hom, Justin; Hung, Li-Wei; Ingraham, Patrick; Konopacky, Quinn M.; Macintosh, Bruce A.; Maire, Jérôme; Marchis, Franck; Marley, Mark S.; Marois, Christian; Metchev, Stanimir; Nielsen, Eric L.; Oppenheimer, Rebecca; Palmer, David W.; Patience, Jenny; Poyneer, Lisa A.; Pueyo, Laurent; Rajan, Abhijith; Rameau, Julien; Rantakyrö, Fredrik T.; Ruffio, Jean-Baptiste; Savransky, Dmitry; Schneider, Adam C.; Sivaramakrishnan, Anand; Song, Inseok; Soummer, Remi; Thomas, Sandrine; Wang, Jason J.; Ward-Duong, Kimberly; Wolff, Schuyler G.

doi:10.3847/1538-3881/ab91b1

Title: Multiband Polarimetric Imaging of HR 4796A with the Gemini Planet Imager

Journal Article · Thu Jul 23 00:00:00 EDT 2020 · The Astronomical Journal (Online)

DOI:https://doi.org/10.3847/1538-3881/ab91b1· OSTI ID:1836920

;

; Kalas, Paul;

;

; De Rosa, Robert J.; Doyon, Rene;

;

HR4796A hosts a well-studied debris disk with a long history due to its high fractional luminosity and favorable inclination, which facilitate both unresolved and resolved observations. We present new J- and K₁-band images of the resolved debris disk HR4796A taken in the polarimetric mode of the Gemini Planet Imager (GPI). The polarized intensity features a strongly forward-scattered brightness distribution and is undetected at the far side of the disk. The total intensity is detected at all scattering angles and also exhibits a strong forward-scattering peak. We use a forward-modeled geometric disk in order to extract geometric parameters, polarized fraction, and total intensity scattering phase functions for these data as well as H-band data previously taken by GPI. Additionally, we find the polarized phase function becomes increasingly more forward-scattering as wavelength increases. We fit Mie and distribution of hollow spheres (DHS) grain models to the extracted functions. We find that it is possible to generate a satisfactory model for the total intensity using a DHS model, but not with a Mie model. We find that no single grain population of DHS or Mie grains of arbitrary composition can simultaneously reproduce the polarized fraction and total intensity scattering phase functions, indicating the need for more sophisticated grain models.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)

Contributing Organization:: G. GPIES Survey

Grant/Contract Number:: AC52-07NA27344; AST-1413718; AST-1615272; NNX15AC89G; NNX15AD95G

OSTI ID:: 1836920

Report Number(s):: LLNL-JRNL-829714; 1045546; TRN: US2300390

Journal Information:: The Astronomical Journal (Online), Vol. 160, Issue 2; ISSN 1538-3881

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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