Hubble Space Telescope Observations of the HD 202628 Debris Disk
John E. Krist, Karl R. Stapelfeldt, Geoffrey Bryden, Peter Plavchan

TL;DR
This paper presents Hubble Space Telescope observations of a faint, inclined debris disk around HD 202628, revealing its structure, extent, and potential planetary influence, and compares it to similar disks like Fomalhaut.
Contribution
First direct imaging and detailed analysis of the faint debris disk around HD 202628, including its geometry, brightness, and potential planetary perturbation evidence.
Findings
Debris disk extends up to ~254 AU from the star.
The disk shows an offset of ~28 AU, indicating possible planetary influence.
The disk is the faintest observed in reflected light to date.
Abstract
A ring-shaped debris disk around the G2V star HD 202628 (d = 24.4 pc) was imaged in scattered light at visible wavelengths using the coronagraphic mode of the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. The ring is inclined by 64 degrees from face-on, based on the apparent major/minor axis ratio, with the major axis aligned along PA = 130 degrees. It has inner and outer radii (>50% maximum surface brightness) of 139 AU and 193 AU in the northwest ansae and 161 AU and 223 AU in the southeast (dr/r ~ 0.4). The maximum visible radial extent is ~254 AU. With a mean surface brightnesses of V ~ 24 mag per square arcsec, this is the faintest debris disk observed to date in reflected light. The center of the ring appears offset from the star by ~28 AU (deprojected). An ellipse fit to the inner edge has an eccentricity of 0.18 and a = 158 AU. This offset, along with the…
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