ALMA Images the Eccentric HD 53143 Debris Disk
Meredith A. MacGregor, Spencer A. Hurt, Christopher C. Stark, Ward S., Howard, Alycia J. Weinberger, Bin Ren, Glenn Schneider, Elodie Choquet,, Dmitri Mawet

TL;DR
ALMA imaging reveals the HD 53143 debris disk to be highly eccentric with a complex structure, indicating possible past dynamical interactions, and shows variability in stellar flux suggesting stellar activity.
Contribution
This is the first millimeter imaging of the HD 53143 debris disk, revealing its high eccentricity and complex structure, and providing insights into its dynamical history.
Findings
Most eccentric debris disk observed to date with eccentricity 0.21
Detection of apocenter glow in the debris disk
Evidence of potential inner disk and past scattering events
Abstract
We present ALMA 1.3 mm observations of the HD~53143 debris disk - the first infrared or millimeter image produced of this ~1 Gyr-old solar-analogue. Previous HST STIS coronagraphic imaging did not detect flux along the minor axis of the disk which could suggest a face-on geometry with two 'clumps' of dust. These ALMA observations reveal a disk with a strikingly different structure. In order to fit models to the millimeter visibilities and constrain the uncertainties on the disk parameters, we adopt an MCMC approach. This is the most eccentric debris disk observed to date with a forced eccentricity of , nearly twice that of the Fomalhaut debris disk, and also displays apocenter glow. Although this eccentric model fits the outer debris disk well, there are significant interior residuals remaining that may suggest a possible edge-on inner disk, which remains unresolved in…
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