Imaging the 44 au Kuiper Belt Analog Debris Ring around HD 141569A With GPI Polarimetry

Authors

• Juan Sebastián Bruzzone, Western University
• Stanimir Metchev, Western University
• Gaspard Duchene, University of California, Berkeley
• Maxwell A. Millar-Blanchaer, Jet Propulsion Laboratory
• Ruobing Dong, University of Victoria
• Thomas M. Esposito, University of California, Berkeley
• Jason J. Wang, University of California, Berkeley
• James R. Graham, University of California, Berkeley
• Johan Mazoyer, Jet Propulsion Laboratory
• Schuyler Wolff, Space Telescope Science Institute
• S. Mark Ammons, Lawrence Livermore National Laboratory
• Adam C. Schneider, School of Earth and Space Exploration
• Alexandra Z. Greenbaum, University of Michigan, Ann Arbor
• Brenda C. Matthews, University of Victoria
• Pauline Arriaga, University of California, Los Angeles
• Vanessa P. Bailey, Jet Propulsion Laboratory
• Travis Barman, The University of Arizona
• Joanna Bulger, National Institutes of Natural Sciences - National Astronomical Observatory of Japan
• Jeffrey Chilcote, Stanford University
• Tara Cotten, University of Georgia
• Robert J. De Rosa, University of California, Berkeley
• Rene Doyon, Institut de Recherche sur les Exoplanètes
• Michael P. Fitzgerald, University of California, Los Angeles
• Katherine B. Follette, Amherst College
• Benjamin L. Gerard, University of Victoria
• Stephen J. Goodsell, Gemini Observatory
• Pascale Hibon, European Southern Observatory Santiago
• Justin Hom, School of Earth and Space Exploration
• Li Wei Hung, University of California, Los Angeles
• Patrick Ingraham, Large Synoptic Survey Telescope
• Paul Kalas, University of California, Berkeley
• Quinn Konopacky, Center for Astrophysics & Space Sciences
• Kimberly Ward-Duong, Amherst CollegeFollow
• et al, Various Institutions

Document Type

Article

Publication Date

2-1-2020

Publication Title

Astronomical Journal

Abstract

We present the first polarimetric detection of the inner disk component around the pre-main-sequence B9.5 star HD 141569A. Gemini Planet Imager H-band (1.65 μm) polarimetric differential imaging reveals the highest signal-to-noise ratio detection of this ring yet attained and traces structure inward to 0.″25 (28 au at a distance of 111 pc). The radial polarized intensity image shows the east side of the disk, peaking in intensity at 0.″40 (44 au) and extending out to 0.″9 (100 au). There is a spiral arm-like enhancement to the south, reminiscent of the known spiral structures on the outer rings of the disk. The location of the spiral arm is coincident with 12CO J = 3-2 emission detected by ALMA and hints at a dynamically active inner circumstellar region. Our observations also show a portion of the middle dusty ring at ∼220 au known from previous observations of this system. We fit the polarized H-band emission with a continuum radiative transfer Mie model. Our best-fit model favors an optically thin disk with a minimum dust grain size close to the blowout size for this system, evidence of ongoing dust production in the inner reaches of the disk. The thermal emission from this model accounts for virtually all of the far-infrared and millimeter flux from the entire HD 141569A disk, in agreement with the lack of ALMA continuum and CO emission beyond ∼100 au. A remaining 8-30 μm thermal excess a factor of ∼2 above our model argues for an as-yet-unresolved warm innermost 5-15 au component of the disk.

Volume

159

Issue

2

DOI

https://doi.org/10.3847/1538-3881/ab5d2e

ISSN

00046256

Rights

© 2020. The American Astronomical Society

Version

Version of Record

Recommended Citation

Bruzzone, Juan Sebastián; Metchev, Stanimir; Duchene, Gaspard; Millar-Blanchaer, Maxwell A.; Dong, Ruobing; Esposito, Thomas M.; Wang, Jason J.; Graham, James R.; Mazoyer, Johan; Wolff, Schuyler; Ammons, S. Mark; Schneider, Adam C.; Greenbaum, Alexandra Z.; Matthews, Brenda C.; Arriaga, Pauline; Bailey, Vanessa P.; Barman, Travis; Bulger, Joanna; Chilcote, Jeffrey; Cotten, Tara; De Rosa, Robert J.; Doyon, Rene; Fitzgerald, Michael P.; Follette, Katherine B.; Gerard, Benjamin L.; Goodsell, Stephen J.; Hibon, Pascale; Hom, Justin; Hung, Li Wei; Ingraham, Patrick; Kalas, Paul; Konopacky, Quinn; Ward-Duong, Kimberly; and al, et, "Imaging the 44 au Kuiper Belt Analog Debris Ring around HD 141569A With GPI Polarimetry" (2020). Astronomy: Faculty Publications, Smith College, Northampton, MA.
https://scholarworks.smith.edu/ast_facpubs/110