Pauline Arriaga
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.
Authors
Michael P. Fitzgerald
Gaspard Duchêne
Paul Kalas
Maxwell A. Millar-Blanchaer
Marshall D. Perrin
Christine H. Chen
Johan Mazoyer
Mark Ammons
Vanessa P. Bailey
Trafis S. Barman
Joanna Bulger
Jeffrey K. Chilcote
Tara Cotten
Robert J. De Rosa
Rene Doyon
Thomas M. Esposito
Katherine B. Follette
Benjamin L. Gerard
Dr Stephen Goodsell stephen.goodsell@durham.ac.uk
Programme Manager
James R. Graham
Alexandra Z. Greenbaum
Pascale Hibon
Justin Hom
Li-Wei Hung
Patrick Ingraham
Quinn M. Konopacky
Bruce A. Macintosh
Jérôme Maire
Franck Marchis
Mark S. Marley
Christian Marois
Stanimir Metchev
Eric L. Nielsen
Rebecca Oppenheimer
David W. Palmer
Jenny Patience
Lisa A. Poyneer
Laurent Pueyo
Abhijith Rajan
Julien Rameau
Fredrik T. Rantakyrö
Jean-Baptiste Ruffio
Dmitry Savransky
Adam C. Schneider
Anand Sivaramakrishnan
Inseok Song
Remi Soummer
Sandrine Thomas
Jason J. Wang
Kimberly Ward-Duong
Schuyler G. Wolff
Abstract
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 K 1-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. 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.
Citation
Arriaga, P., Fitzgerald, M. P., Duchêne, G., Kalas, P., Millar-Blanchaer, M. A., Perrin, M. D., …Wolff, S. G. (2020). Multiband Polarimetric Imaging of HR 4796A with the Gemini Planet Imager. Astronomical Journal, 160(2), Article 79. https://doi.org/10.3847/1538-3881/ab91b1
Journal Article Type | Article |
---|---|
Acceptance Date | May 8, 2020 |
Online Publication Date | Jul 23, 2020 |
Publication Date | 2020-08 |
Deposit Date | Aug 12, 2020 |
Publicly Available Date | Aug 12, 2020 |
Journal | Astronomical Journal |
Print ISSN | 0004-6256 |
Publisher | IOP Publishing |
Peer Reviewed | Peer Reviewed |
Volume | 160 |
Issue | 2 |
Article Number | 79 |
DOI | https://doi.org/10.3847/1538-3881/ab91b1 |
Public URL | https://durham-repository.worktribe.com/output/1294711 |
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Copyright Statement
© 2020. The American Astronomical Society. All rights reserved.
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