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

Pauline Arriaga (Department of Physics; Astronomy; University of; California; Los Angeles); Michael P. Fitzgerald (Department of Physics and; Astronomy; University of California; Los Angeles); Gaspard Duch\^ene; (Astronomy Department; University of California; Berkeley; Univ. Grenoble; Alpes/CNRS); Paul Kalas (Astronomy Department; University of California,; Berkeley; SETI Institute; Carl Sagan Center; Institute of Astrophysics,; FORTH); Maxwell A. Millar-Blanchaer (Jet Propulsion Laboratory; California; Institute of Technology); Marshall D. Perrin (Space Telescope Science; Institute); Christine H. Chen (Space Telescope Science Institute); Johan; Mazoyer (NASA Jet Propulsion Laboratory; California Institute of Technology; and LESIA; Observatoire de Paris; Universit\'e PSL; CNRS; Sorbonne; Universit\'e; Universit\'e de Paris); Mark Ammons (Lawrence Livermore; National Laboratory); Vanessa P. Bailey (Jet Propulsion Laboratory,; California Institute of Technology); Trafis S. Barman (Lunar; Planetary; Lab; University of Arizona); Joanna Bulger (Subaru Telescope; NAOJ); Jeffrey; K. Chilcote (Department of Physics; University of Notre Dame); Tara Cotten; (Department of Physics; Astronomy; University of Georgia); Robert J. De; Rosa (European Southern Observatory); Rene Doyon (Institut de Recherche sur; les Exoplan\`etes; D\'epartement de physique; Universit\'e de Montr\'eal),; Thomas M. Esposito (Astronomy Department; University of California,; Berkeley); Katherine B. Follette (Physics; Astronomy Department; Amherst; College); Benjamin L. Gerard (University of Victoria; Department of Physics; and Astronomy National Research Council of Canada Herzberg); Stephen Goodsell; (Department of Physics; Durham University); James R. Graham (Astronomy; Department; University of California; Berkeley); Alexandra Z. Greenbaum; (Department of Astronomy; University of Michigan) Pascale Hibon (European; Southern Observatory); Justin Hom (School of Earth; Space Exploration,; Arizona State University); Li-Wei Hung (Natural Sounds; Night Skies; Division; National Park Service); Patrick Ingraham (Large Synoptic Survey; Telescope); Quinn M. Konopacky (Center for Astrophysics; Space Sciences,; University of California; San Diego); Bruce A. Macintosh (Kavli Institute for; Particle Astrophysics; Cosmology; Department of Physics; Stanford; University); J\'er\^ome Maire (Center for Astrophysics; Space Sciences,; University of California; San Diego); Franck Marchis (SETI Institute; Carl; Sagan Center); Mark S. Marley (Space Science Division; NASA Ames Research; Center); Christian Marois (National Research Council of Canada Herzberg and; University of Victoria; Department of Physics; Astronomy); Stanimir; Metchev (Department of Physics; Astronomy; Centre for Planetary Science; and Exploration; The University of Western Ontario; Department of Physics; and Astronomy; Stony Brook University); Eric L. Nielsen (Kavli Institute for; Particle Astrophysics; Cosmology; Department of Physics; Stanford; University); Rebecca Oppenheimer (American Museum of Natural History,; Department of Astrophysics); David W. Palmer (Lawrence Livermore National; Laboratory); Jenny Patience (School of Earth; Space Exploration; Arizona; State University); Lisa A. Poyneer (Lawrence Livermore National Laboratory),; Laurent Pueyo (Space Telescope Science Institute); Abhijith Rajan (Space; Telescope Science Institute); Julien Rameau (Institut de Recherche sur les; Exoplan\`etes; D\'epartement de physique; Universit\'e de Montr\'eal),; Fredrik T. Rantakyr\"o (Gemini Observatory); Jean-Baptiste Ruffio (Kavli; Institute for Particle Astrophysics; Cosmology); Dmitry Savransky (Sibley; School of Mechanical; Aerospace Engineering); Adam C. Schneider (Physics; and Astronomy; University of Georgia); Anand Sivaramakrishnan (Space; Telescope Science Institute); Inseok Song (Department of Physics and; Astronomy; University of Georgia); Remi Soummer (Space Telescope Science; Institute); Sandrine Thomas (Large Synoptic Survey Telescope); Jason J. Wang; (Department of Astronomy; California Institute of Technology); Kimberly; Ward-Duong (Five College Astronomy Department; Amherst College); Schuyler G.; Wolff (Leiden Observatory; Leiden University)

arXiv:2006.06818·astro-ph.EP·July 29, 2020

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

Pauline Arriaga (Department of Physics, Astronomy, University of, California, Los Angeles), Michael P. Fitzgerald (Department of Physics and, Astronomy, University of California, Los Angeles), Gaspard Duch\^ene, (Astronomy Department, University of California, Berkeley

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TL;DR

This study presents multiband polarimetric images of HR 4796A's debris disk, revealing wavelength-dependent scattering properties and highlighting the limitations of current grain models in explaining observed scattering behaviors.

Contribution

First detailed multiband polarimetric imaging of HR 4796A's debris disk, analyzing scattering phase functions and testing grain models to improve understanding of dust properties.

Findings

01

Polarized phase function becomes more forward scattering with increasing wavelength.

02

DHS models can fit total intensity data but not polarized fraction data.

03

Current grain models are insufficient to simultaneously explain all observed scattering features.

Abstract

HR4796A hosts a well-studied debris disk with a long history due to its high fractional luminosity and favorable inclination lending itself well to 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 modelled 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…

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