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

Pauline Arriaga; 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; Stephen Goodsell; 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

doi:10.3847/1538-3881/ab91b1

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

Pauline Arriaga, 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, Stephen GoodsellJames 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

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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.

Original language	English (US)
Article number	79
Journal	Astronomical Journal
Volume	160
Issue number	2
DOIs	https://doi.org/10.3847/1538-3881/ab91b1
State	Published - Aug 2020

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-3881/ab91b1

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Arriaga, P., Fitzgerald, M. P., Duchêne, G., Kalas, P., Millar-Blanchaer, M. A., Perrin, M. D., Chen, C. H., Mazoyer, J., Ammons, M., Bailey, V. P., Barman, T. S., Bulger, J., Chilcote, J. K., Cotten, T., De Rosa, R. J., Doyon, R., Esposito, T. M., Follette, K. B., Gerard, B. L., ... 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

Arriaga, P, Fitzgerald, MP, Duchêne, G, Kalas, P, Millar-Blanchaer, MA, Perrin, MD, Chen, CH, Mazoyer, J, Ammons, M, Bailey, VP, Barman, TS, Bulger, J, Chilcote, JK, Cotten, T, De Rosa, RJ, Doyon, R, Esposito, TM, Follette, KB, Gerard, BL, Goodsell, S, Graham, JR, Greenbaum, AZ, Hibon, P, Hom, J, Hung, LW, Ingraham, P, Konopacky, QM, MacIntosh, BA, Maire, J, Marchis, F, Marley, MS, Marois, C, Metchev, S, Nielsen, EL, Oppenheimer, R, Palmer, DW, Patience, J, Poyneer, LA, Pueyo, L, Rajan, A, Rameau, J, Rantakyrö, FT, Ruffio, JB, Savransky, D, Schneider, AC, Sivaramakrishnan, A, Song, I, Soummer, R, Thomas, S, Wang, JJ, Ward-Duong, K & Wolff, SG 2020, 'Multiband Polarimetric Imaging of HR 4796A with the Gemini Planet Imager', Astronomical Journal, vol. 160, no. 2, 79. https://doi.org/10.3847/1538-3881/ab91b1

@article{ff9803234768475fa3945f1d5210d683,

title = "Multiband Polarimetric Imaging of HR 4796A with the Gemini Planet Imager",

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.",

author = "Pauline Arriaga and Fitzgerald, {Michael P.} and Gaspard Duch{\^e}ne and Paul Kalas and Millar-Blanchaer, {Maxwell A.} and Perrin, {Marshall D.} and Chen, {Christine H.} and Johan Mazoyer and Mark Ammons and Bailey, {Vanessa P.} and Barman, {Trafis S.} and Joanna Bulger and Chilcote, {Jeffrey K.} and Tara Cotten and {De Rosa}, {Robert J.} and Rene Doyon and Esposito, {Thomas M.} and Follette, {Katherine B.} and Gerard, {Benjamin L.} and Stephen Goodsell and Graham, {James R.} and Greenbaum, {Alexandra Z.} and Pascale Hibon and Justin Hom and Hung, {Li Wei} and Patrick Ingraham and Konopacky, {Quinn M.} and MacIntosh, {Bruce A.} and J{\'e}r{\^o}me Maire and Franck Marchis and Marley, {Mark S.} and Christian Marois and Stanimir Metchev and Nielsen, {Eric L.} and Rebecca Oppenheimer and Palmer, {David W.} and Jenny Patience and Poyneer, {Lisa A.} and Laurent Pueyo and Abhijith Rajan and Julien Rameau and Rantakyr{\"o}, {Fredrik T.} and Ruffio, {Jean Baptiste} and Dmitry Savransky and Schneider, {Adam C.} and Anand Sivaramakrishnan and Inseok Song and Remi Soummer and Sandrine Thomas and Wang, {Jason J.} and Kimberly Ward-Duong and Wolff, {Schuyler G.}",

year = "2020",

month = aug,

doi = "10.3847/1538-3881/ab91b1",

language = "English (US)",

volume = "160",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "2",

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T1 - Multiband Polarimetric Imaging of HR 4796A with the Gemini Planet Imager

AU - Arriaga, Pauline

AU - Fitzgerald, Michael P.

AU - Duchêne, Gaspard

AU - Kalas, Paul

AU - Millar-Blanchaer, Maxwell A.

AU - Perrin, Marshall D.

AU - Chen, Christine H.

AU - Mazoyer, Johan

AU - Ammons, Mark

AU - Bailey, Vanessa P.

AU - Barman, Trafis S.

AU - Bulger, Joanna

AU - Chilcote, Jeffrey K.

AU - Cotten, Tara

AU - De Rosa, Robert J.

AU - Doyon, Rene

AU - Esposito, Thomas M.

AU - Follette, Katherine B.

AU - Gerard, Benjamin L.

AU - Goodsell, Stephen

AU - Graham, James R.

AU - Greenbaum, Alexandra Z.

AU - Hibon, Pascale

AU - Hom, Justin

AU - Hung, Li Wei

AU - Ingraham, Patrick

AU - Konopacky, Quinn M.

AU - MacIntosh, Bruce A.

AU - Maire, Jérôme

AU - Marchis, Franck

AU - Marley, Mark S.

AU - Marois, Christian

AU - Metchev, Stanimir

AU - Nielsen, Eric L.

AU - Oppenheimer, Rebecca

AU - Palmer, David W.

AU - Patience, Jenny

AU - Poyneer, Lisa A.

AU - Pueyo, Laurent

AU - Rajan, Abhijith

AU - Rameau, Julien

AU - Rantakyrö, Fredrik T.

AU - Ruffio, Jean Baptiste

AU - Savransky, Dmitry

AU - Schneider, Adam C.

AU - Sivaramakrishnan, Anand

AU - Song, Inseok

AU - Soummer, Remi

AU - Thomas, Sandrine

AU - Wang, Jason J.

AU - Ward-Duong, Kimberly

AU - Wolff, Schuyler G.

PY - 2020/8

Y1 - 2020/8

N2 - 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.

AB - 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.

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M3 - Article

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JO - Astronomical Journal

JF - Astronomical Journal

IS - 2

M1 - 79

ER -

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

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