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Metal pollution onto white dwarfs is a wide-spread phenomenon that remainspuzzling. Some of these white dwarfs also harbour gaseous debris disks. Theiremission lines open a unique window to the physical properties of the pollutingmaterial, lending insights to their origin. Here, we model the emission linekinematics for the gas disk around SDSS J1228+1040, a system that has beencontinuously monitored for over two decades. Our model shows that the disk massis strongly peaked at one solar radius (modulo the unknown inclination), andthe disk eccentricity decreases from a value of 0.44 at the disk inner edge, tonearly zero at the outer edge. This eccentricity profile is exactly what oneexpects if the disk is in a global eccentric mode, precessing rigidly under thecombined forces of general relativity and gas pressure, and with a period of 20yrs. The gas disk contains a mass that is roughly equivalent to that of a100-km rocky body, while the mass of the accompanying dust disk is likelyinsignificant. The disk eccentricity confirms an origin in tidal disruption,and we suggest that the disrupted body is sourced from a Mars-mass planetesimaldisk within a few AU. More detailed analysis of this disk is warranted.

Eccentric Gas Disk Orbiting the White Dwarf SDSS J1228+1040