YSO peculiar motions and magnetic fields Do young stars retain their natal magnetic field orientation?

We test whether the peculiar (bulk-subtracted) proper-motion directions of young stellar objects (YSOs) show a preferred orientation relative to the plane-of-sky magnetic field of their natal cloud, and whether such behaviour is universal or cloud dependent. For 2160 YSOs in seven nearby clouds (Chamaeleon I, Perseus, Ophiuchus, Orion A South and North, Taurus, Lupus) we cross-matched published membership catalogues with Gaia DR3. Bulk motion was removed per kinematic subgroup by subtracting the mean space velocity including the perspective term; the residual peculiar proper motion was compared with the Planck 353 GHz plane-of-sky field. Alignment was quantified with the Projected Rayleigh Statistic ($Z_x$) and a Kuiper test. Using total proper motions, every cloud shows a spurious preferred orientation ($Z_x^{\mathrm{t}\mathrm{o}\mathrm{t}}$ up to $+16.5$). After bulk removal the picture changes qualitatively: Orion,A South and North show significant perpendicular orientation ($Z_x=-4.4,-6.7$), Perseus shows significant alignment ($Z_x=+3.9$), and Chamaeleon I, Taurus, Ophiuchus and Lupus are consistent with isotropy. The apparent `universal alignment’ seen in the raw motions is a bulk-motion artefact. Frame-corrected YSO peculiar motions thus retain a measurable but heterogeneous relationship to the natal field, consistent with stars inheriting the velocity field of field-organised natal gas rather than being dynamically steered by the field.