The Astrophysical Journal (Jan 2024)
SCExAO/CHARIS Near-infrared Scattered-light Imaging and Integral Field Spectropolarimetry of the AB Aurigae Protoplanetary System
- Erica Dykes,
- Thayne Currie,
- Kellen Lawson,
- Miles Lucas,
- Tomoyuki Kudo,
- Minghan Chen,
- Olivier Guyon,
- Tyler D. Groff,
- Julien Lozi,
- Jeffrey Chilcote,
- Timothy D. Brandt,
- Sebastien Vievard,
- Nour Skaf,
- Vincent Deo,
- Mona El Morsy,
- Danielle Bovie,
- Taichi Uyama,
- Carol Grady,
- Michael Sitko,
- Jun Hashimoto,
- Frantz Martinache,
- Nemanja Jovanovic,
- Motohide Tamura,
- N. Jeremy Kasdin
Affiliations
- Erica Dykes
- ORCiD
- Department of Physics and Astronomy, University of Texas-San Antonio , San Antonio, TX, USA
- Thayne Currie
- ORCiD
- Department of Physics and Astronomy, University of Texas-San Antonio , San Antonio, TX, USA; Subaru Telescope, National Astronomical Observatory of Japan , 650 North A‘ohōkū Place, Hilo, HI 96720, USA
- Kellen Lawson
- ORCiD
- NASA-Goddard Space Flight Center , Greenbelt, MD, USA
- Miles Lucas
- ORCiD
- Institute for Astronomy, University of Hawaii-Manoa , Honolulu, HI, USA
- Tomoyuki Kudo
- Subaru Telescope, National Astronomical Observatory of Japan , 650 North A‘ohōkū Place, Hilo, HI 96720, USA
- Minghan Chen
- ORCiD
- Department of Physics, University of California , Santa Barbara, CA, USA
- Olivier Guyon
- ORCiD
- Subaru Telescope, National Astronomical Observatory of Japan , 650 North A‘ohōkū Place, Hilo, HI 96720, USA; Steward Observatory, Department of Astronomy, The University of Arizona , Tucson, AZ 85721, USA; College of Optical Sciences, University of Arizona , Tucson, AZ 85721, USA; Astrobiology Center, National Institutes of Natural Sciences , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
- Tyler D. Groff
- ORCiD
- NASA-Goddard Space Flight Center , Greenbelt, MD, USA
- Julien Lozi
- Subaru Telescope, National Astronomical Observatory of Japan , 650 North A‘ohōkū Place, Hilo, HI 96720, USA
- Jeffrey Chilcote
- ORCiD
- Department of Physics and Astronomy, University of Notre Dame , South Bend, IN, USA
- Timothy D. Brandt
- ORCiD
- Department of Physics, University of California , Santa Barbara, CA, USA
- Sebastien Vievard
- ORCiD
- Subaru Telescope, National Astronomical Observatory of Japan , 650 North A‘ohōkū Place, Hilo, HI 96720, USA
- Nour Skaf
- ORCiD
- Department of Astronomy & Astrophysics, University of California , Santa Cruz, CA 95064, USA
- Vincent Deo
- ORCiD
- Subaru Telescope, National Astronomical Observatory of Japan , 650 North A‘ohōkū Place, Hilo, HI 96720, USA
- Mona El Morsy
- ORCiD
- Department of Physics and Astronomy, University of Texas-San Antonio , San Antonio, TX, USA
- Danielle Bovie
- ORCiD
- Department of Physics and Astronomy, University of Texas-San Antonio , San Antonio, TX, USA
- Taichi Uyama
- ORCiD
- Department of Physics and Astronomy, California State University-Northridge , Northridge, CA, USA
- Carol Grady
- ORCiD
- Eureka Scientific , 2452 Delmer Street Suite 100, Oakland, CA, USA
- Michael Sitko
- ORCiD
- Space Sciences Institute , 4765 Walnut Street, Suite B, Boulder, CO 80301, USA
- Jun Hashimoto
- ORCiD
- Astrobiology Center, National Institutes of Natural Sciences , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan; National Astronomical Observatory of Japan , 2-21-2, Osawa, Mitaka, Tokyo 181-8588, Japan; Department of Astronomy, Graduate School of Science, The University of Tokyo , 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Frantz Martinache
- ORCiD
- Université Côte d’Azur , Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France
- Nemanja Jovanovic
- ORCiD
- Department of Astronomy, California Institute of Technology , 1200 East California Boulevard, Pasadena, CA 91125, USA
- Motohide Tamura
- ORCiD
- Astrobiology Center, National Institutes of Natural Sciences , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan; National Astronomical Observatory of Japan , 2-21-2, Osawa, Mitaka, Tokyo 181-8588, Japan; Department of Astronomy, Graduate School of Science, The University of Tokyo , 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- N. Jeremy Kasdin
- ORCiD
- Department of Mechanical Engineering, Princeton University , Princeton, NJ, USA
- DOI
- https://doi.org/10.3847/1538-4357/ad8ba0
- Journal volume & issue
-
Vol. 977,
no. 2
p. 172
Abstract
We analyze near-infrared integral field spectropolarimetry of the AB Aurigae protoplanetary disk and protoplanet (AB Aur b), obtained with SCExAO/CHARIS in 22 wavelength channels covering the J , H , and K passbands ( λ _0 = 1.1–2.4 μ m) over angular separations of ρ ≈ 0.″13 to 1.″1 (∼20–175 au). Our images resolve spiral structures in the disk in each CHARIS channel. At the longest wavelengths, the data may reveal an extension of the western spiral seen in previous polarimetric data at ρ 1.3 μ m. While the observed disk color is extremely red across JHK , the disk has a blue intrinsic scattering color consistent with small dust grains. The disk’s polarization spectrum is redder than AB Aur b’s total intensity spectrum. The polarization fraction peaks at ∼0.6 along the major disk axis. Radiative transfer modeling of the CHARIS data shows that small, porous dust grains with a porosity of p = 0.6–0.8 better reproduce the scattered-light appearance of the disk than more compact spheres ( p = 0.3), especially the polarization fraction. This work demonstrates the utility of integral field spectropolarimetry to characterize structures in protoplanetary disks and elucidate the properties of the disks’ dust.
Keywords
