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We constrain the angular momentum architecture of HD 106906, a 13 $\pm$ 2 Myrold system in the ScoCen complex composed of a compact central binary, a widelyseparated planetary-mass tertiary HD 106906 b, and a debris disk nested betweenthe binary and tertiary orbital planes. We measure the orientations of threevectors: the companion spin axis, companion orbit normal, and disk normal.Using near-IR high-resolution spectra from Gemini/IGRINS, we obtain a projectedrotational velocity of $v\sin{i_p}$ = 9.5 $\pm$ 0.2 km/s for HD 106906 b. Thismeasurement together with a published photometric rotation period implies thecompanion is viewed nearly pole-on, with a line-of-sight spin axis inclinationof $i_p$ = 14 $\pm$ 4 degrees or 166 $\pm$ 4 degrees. By contrast, the debrisdisk is known to be viewed nearly edge-on. The likely misalignment of all threevectors suggests HD 106906 b formed by gravitational instability in a turbulentenvironment, either in a disk or cloud setting.

Obliquity Constraints on the Planetary-mass Companion HD 106906 b