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HD 106906 is a young, binary stellar system, located in the Lower CentaurusCrux (LCC) group. This system is unique among discovered systems in that itcontains an asymmetrical debris disk, as well as an 11 M$_{Jup}$ planetcompanion, at a separation of $\sim$735 AU. Only a handful of other systems areknown to contain both a disk and directly imaged planet, where HD 106906 is theonly one in which the planet has apparently been scattered. The debris disk isnearly edge on, and extends roughly to $>$500 AU, where previous studies withHST have shown the outer regions to have high asymmetry. To better understandthe structure and composition of the disk, we have performed a deeppolarimetric study of HD 106906's asymmetrical debris disk using newly obtained$H$-, $J$-, and $K1$-band polarimetric data from the Gemini Planet Imager(GPI). An empirical analysis of our data supports a disk that is asymmetricalin surface brightness and structure, where fitting an inclined ring model tothe disk spine suggests that the disk may be highly eccentric ($e\gtrsim0.16$).A comparison of the disk flux with the stellar flux in each band suggests ablue color that also does not significantly vary across the disk. We discussthese results in terms of possible sources of asymmetry, where we find thatdynamical interaction with the planet companion, HD 106906b, is a likelycandidate.

A Deep Polarimetric Study of the Asymmetrical Debris Disk HD 106906