SCExAO/CHARIS near-IR high-contrast imaging and integral field spectroscopy of the HIP 79977 debris disk

Sean Goebel, Thayne Currie, Olivier Guyon, Timothy D. Brandt, Tyler D. Groff, Nemanja Jovanovic, N. Jeremy Kasdin, Julien Lozi, Klaus Hodapp, Frantz Martinache, Carol Grady, Masa Hayashi, Jungmi Kwon, Michael W. McElwain, Yi Yang, Motohide Tamura

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3 Scopus citations

Abstract

We present new, near-infrared (1.1-2.4 μm) high-contrast imaging of the bright debris disk surrounding HIP 79977 with the Subaru Coronagraphic Extreme Adaptive Optics system (SCExAO) coupled with the CHARIS integral field spectrograph. SCExAO/CHARIS resolves the disk down to smaller angular separations of (0 11; r∼14 au) and at a higher significance than previously achieved at the same wavelengths. The disk exhibits a marginally significant east-west brightness asymmetry in H band that requires confirmation. Geometrical modeling suggests a nearly edge-on disk viewed at a position angle of ∼114°6 east of north. The disk is best-fit by scattered-light models assuming strongly forward-scattering grains (g∼0.5-0.65) confined to a torus with a peak density at r0∼53-75 au. We find that a shallow outer density power law of αout=-1 to -3 and flare index of β=1 are preferred. Other disk parameters (e.g., inner density power law and vertical scale height) are more poorly constrained. The disk has a slightly blue intrinsic color and its profile is broadly consistent with predictions from birth ring models applied to other debris disks. While HIP 79977's disk appears to be more strongly forwardscattering than most resolved disks surrounding 5-30 Myr old stars, this difference may be due to observational biases favoring forward-scattering models for inclined disks versus lower inclination, ostensibly neutral-scattering disks like HR 4796A's. Deeper, higher signal-to-noise SCExAO/CHARIS data can better constrain the disk's dust composition.

Original languageEnglish (US)
Article numberaaeb24
JournalAstronomical Journal
Volume156
Issue number6
DOIs
StatePublished - 2018

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Circumstellar matter
  • Planetary systems
  • Stars: Individual (HIP 79977)
  • Techniques: High angular resolution

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    Goebel, S., Currie, T., Guyon, O., Brandt, T. D., Groff, T. D., Jovanovic, N., Kasdin, N. J., Lozi, J., Hodapp, K., Martinache, F., Grady, C., Hayashi, M., Kwon, J., McElwain, M. W., Yang, Y., & Tamura, M. (2018). SCExAO/CHARIS near-IR high-contrast imaging and integral field spectroscopy of the HIP 79977 debris disk. Astronomical Journal, 156(6), [aaeb24]. https://doi.org/10.3847/1538-3881/aaeb24