Kavli Affiliate: Bruce Macintosh
| First 5 Authors: Briley L. Lewis, Michael P. Fitzgerald, Thomas M. Esposito, Pauline Arriaga, Ronald Lopez
| Summary:
The 16 Myr-old A0V star HD 156623 in the Scorpius–Centaurus association
hosts a high-fractional-luminosity debris disk, recently resolved in scattered
light for the first time by the Gemini Planet Imager (GPI) in polarized
intensity. We present new analysis of the GPI H-band polarimetric detection of
the HD 156623 debris disk, with particular interest in its unique morphology.
This debris disk lacks a visible inner clearing, unlike the majority of
low-inclination disks in the GPI sample and in Sco-Cen, and it is known to
contain CO gas, positioning it as a candidate “hybrid” or “shielded” disk.
We use radiative transfer models to constrain the geometric parameters of the
disk based on scattered light data and thermal models to constrain the
unresolved inner radius based on the system’s spectral energy distribution
(SED). We also compute a measurement of the polarized scattering phase
function, adding to the existing sample of empirical phase function
measurements. We find that HD 156623’s debris disk inner radius is constrained
to less than 26.6 AU from scattered light imagery and less than 13.4 AU from
SED modeling at a 99.7% confidence interval, and suggest that gas drag may play
a role in retaining sub-blowout size dust grains so close to the star.
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