Multiband GPI Imaging of the HR 4796A Debris Disk
Christine Chen
(1, 2)
,
Johan Mazoyer
(3)
,
Charles Poteet
(1)
,
Bin Ren
(2)
,
Gaspard Duchêne
(4, 5)
,
Justin Hom
(6)
,
Pauline Arriaga
(7)
,
Maxwell Millar-Blanchaer
(8)
,
Jessica Arnold
(9)
,
Vanessa Bailey
(10)
,
Juan Sebastián Bruzzone
(11)
,
Jeffrey Chilcote
(12)
,
Elodie Choquet
(13)
,
Robert de Rosa
(14)
,
Zachary Draper
(15)
,
Thomas Esposito
(4)
,
Michael Fitzgerald
(7)
,
Katherine Follette
(16)
,
Pascale Hibon
(14)
,
Dean Hines
(1)
,
Paul Kalas
(4, 17)
,
Franck Marchis
(17)
,
Brenda Matthews
(17)
,
Julien Milli
(5)
,
Jennifer Patience
(6)
,
Marshall Perrin
(1)
,
Laurent Pueyo
(1)
,
Abhijith Rajan
(1)
,
Fredrik Rantakyrö
(18)
,
Timothy Rodigas
(19)
,
Gael Roudier
(10)
,
Glenn Schneider
(20)
,
Rémi Soummer
(1)
,
Christopher Stark
(1)
,
Jason Wang
(8)
,
Kimberly Ward-Duong
(1)
,
Alycia Weinberger
(19)
,
David Wilner
(21)
,
Schuyler Wolff
(20)
1
STSci -
Space Telescope Science Institute
2 JHU - Johns Hopkins University
3 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics
4 Department of Astronomy [Berkeley]
5 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble
6 ASU - Arizona State University [Tempe]
7 Department of Physics and Astronomy [UCLA, Los Angeles]
8 Caltech Department of Astronomy [Pasadena]
9 Carnegie Institution for Science
10 JPL - Jet Propulsion Laboratory
11 UWO - University of Western Ontario
12 Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556
13 LAM - Laboratoire d'Astrophysique de Marseille
14 ESO - European Southern Observatory [Santiago]
15 UVIC - University of Victoria [Canada]
16 Physics and Astronomy Department, Amherst College
17 SETI - Search for Extraterrestrial Intelligence Institute
18 Gemini Observatory [Southern Operations Center]
19 Department of Terrestrial Magnetism [Carnegie Institution]
20 Steward Observatory
21 CfA - Harvard-Smithsonian Center for Astrophysics
2 JHU - Johns Hopkins University
3 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics
4 Department of Astronomy [Berkeley]
5 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble
6 ASU - Arizona State University [Tempe]
7 Department of Physics and Astronomy [UCLA, Los Angeles]
8 Caltech Department of Astronomy [Pasadena]
9 Carnegie Institution for Science
10 JPL - Jet Propulsion Laboratory
11 UWO - University of Western Ontario
12 Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556
13 LAM - Laboratoire d'Astrophysique de Marseille
14 ESO - European Southern Observatory [Santiago]
15 UVIC - University of Victoria [Canada]
16 Physics and Astronomy Department, Amherst College
17 SETI - Search for Extraterrestrial Intelligence Institute
18 Gemini Observatory [Southern Operations Center]
19 Department of Terrestrial Magnetism [Carnegie Institution]
20 Steward Observatory
21 CfA - Harvard-Smithsonian Center for Astrophysics
Johan Mazoyer
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- IdHAL : jmazoyer
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Gaspard Duchêne
- Fonction : Auteur
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- ORCID : 0000-0002-5092-6464
Justin Hom
- Fonction : Auteur
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- ORCID : 0000-0001-9994-2142
Pauline Arriaga
- Fonction : Auteur
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Maxwell Millar-Blanchaer
- Fonction : Auteur
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Jeffrey Chilcote
- Fonction : Auteur
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Elodie Choquet
- Fonction : Auteur
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Robert de Rosa
- Fonction : Auteur
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Zachary Draper
- Fonction : Auteur
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- ORCID : 0000-0002-1834-3496
Katherine Follette
- Fonction : Auteur
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- ORCID : 0000-0002-7821-0695
Paul Kalas
- Fonction : Auteur
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- ORCID : 0000-0002-6221-5360
Franck Marchis
- Fonction : Auteur
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- ORCID : 0000-0001-7016-7277
Brenda Matthews
- Fonction : Auteur
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- ORCID : 0000-0003-3017-9577
Julien Milli
- Fonction : Auteur
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- IdHAL : julien-milli
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- IdRef : 197344615
Marshall Perrin
- Fonction : Auteur
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- ORCID : 0000-0002-3191-8151
Rémi Soummer
- Fonction : Auteur
- PersonId : 792132
- ORCID : 0000-0003-2753-2819
David Wilner
- Fonction : Auteur
- PersonId : 784605
- ORCID : 0000-0003-1526-7587
Résumé
We have obtained Gemini Planet Imager (GPI) J-, H-, K1-, and K2-Spec observations of the iconic debris ring around the young, main-sequence star HR 4796A. We applied several point-spread function (PSF) subtraction techniques to the observations (Mask-and-Interpolate, RDI-NMF, RDI-KLIP, and ADI-KLIP) to measure the geometric parameters and the scattering phase function for the disk. To understand the systematic errors associated with PSF subtraction, we also forward-modeled the observations using a Markov Chain Monte Carlo framework and a simple model for the disk. We found that measurements of the disk geometric parameters were robust, with all of our analyses yielding consistent results; however, measurements of the scattering phase function were challenging to reconstruct from PSF-subtracted images, despite extensive testing. As a result, we estimated the scattering phase function using disk modeling. We searched for a dependence of the scattering phase function with respect to the GPI filters but found none. We compared the H-band scattering phase function with that measured by Hubble Space Telescope STIS at visual wavelengths and discovered a blue color at small scattering angles and a red color at large scattering angles, consistent with predictions and laboratory measurements of large grains. Finally, we successfully modeled the SPHERE H2 HR 4796A scattered phase function using a distribution of hollow spheres composed of silicates, carbon, and metallic iron.