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Misalignments within protoplanetary discs are now commonly observed, andfeatures such as shadows in scattered light images indicate departure from aco-planar geometry. VLT/SPHERE observations of the disc around HD 143006 show alarge-scale asymmetry, and two narrow dark lanes which are indicative ofshadowing. ALMA observations also reveal the presence of rings and gaps in thedisc, along with a bright arc at large radii. We present new hydrodynamicsimulations of HD 143006, and show that a configuration with both a stronglyinclined binary and an outer planetary companion is the most plausible toexplain the observed morphological features. We compute synthetic observationsfrom our simulations, and successfully reproduce both the narrow shadows andthe brightness asymmetry seen in IR scattered light. Additionally, we reproducethe large dust observed in the mm continuum, due to a 10 Jupiter mass planetdetected in the CO kinematics. Our simulations also show the formation of acircumplanetary disc, which is misaligned with respect to the outer disc. Thenarrow shadows cast by the inner disc and the planet-induced "kink" in the disckinematics are both expected to move on a time-scale of $\sim$ 5-10 years,presenting a potentially observable test of our model. If confirmed, HD 143006would be the first known example of a circumbinary planet on a stronglymisaligned orbit.

HD 143006: circumbinary planet or misaligned disc?