Multiband Imaging of the HD 36546 Debris Disk: A Refined View from SCExAO/CHARIS

Kellen Lawson, Thayne Currie, John P. Wisniewski, Motohide Tamura, Jean Charles Augereau, Timothy D. Brandt, Olivier Guyon, N. Jeremy Kasdin, Tyler D. Groff, Julien Lozi, Vincent Deo, Sebastien Vievard, Jeffrey Chilcote, Nemanja Jovanovic, Frantz Martinache, Nour Skaf, Thomas Henning, Gillian Knapp, Jungmi Kwon, Michael W. McElwainTae Soo Pyo, Michael L. Sitko, Taichi Uyama, Kevin Wagner

Research output: Contribution to journalArticlepeer-review

Abstract

We present the first multiwavelength (near-infrared; 1.1-2.4 μm) imaging of HD 36546's debris disk, using the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system coupled with the Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS). As a 3-10 Myr old star, HD 36546 presents a rare opportunity to study a debris disk at very early stages. SCExAO/CHARIS imagery resolves the disk over angular separations of ρ ∼ 0.″25-1.″0 (projected separations of rproj ∼ 25-101 au) and enables the first spectrophotometric analysis of the disk. The disk's brightness appears symmetric between its eastern and western extents, and it exhibits slightly blue near-infrared colors on average (e.g., J-K = -0.4 0.1) - suggesting copious submicron-sized or highly porous grains. Through detailed modeling adopting a Hong scattering phase function (SPF), instead of the more common Henyey-Greenstein function, and using the differential evolution optimization algorithm, we provide an updated schematic of HD 36546's disk. The disk has a shallow radial dust density profile (α in ≈ 1.0 and α out ≈ -1.5), a fiducial radius of r 0 ≈ 82.7 au, an inclination of i ≈ 79. 1, and a position angle of PA ≈ 80. 1. Through spine tracing, we find a spine that is consistent with our modeling, but also with a "swept-back wing"geometry. Finally, we provide constraints on companions, including limiting a companion responsible for a marginal Hipparcos-Gaia acceleration to a projected separation of ≲0.″2 and to a minimum mass of ≲11 M Jup.

Original languageEnglish (US)
Article number293
JournalAstronomical Journal
Volume162
Issue number6
DOIs
StatePublished - Dec 1 2021

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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