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We present the discovery of eight young M7-L2 dwarfs in the Taurusstar-forming region and the Scorpius-Centaurus OB Association, serendipitouslyfound during a wide-field search for L/T transition dwarfs using Pan-STARRS1(optical) and WISE (mid-infrared) photometry. We identify PSO J060.3200+25.9644(near-infrared spectral type L1) and PSO J077.1033+24.3809 (L2) as new membersof Taurus based on their VL-G gravity classifications, the consistency of theirphotometry and proper motions with previously known Taurus objects, and the lowprobability of contamination by field objects. PSO J077.1033+24.3809 is thecoolest substellar member of Taurus found to date. Both Taurus objects areamong the lowest mass free-floating objects ever discovered, with estimatedmasses $\approx$6 M$_{\rm Jup}$, and provide further evidence that isolatedplanetary-mass objects can form as part of normal star-formation processes. PSOJ060.3200+25.9644 (a.k.a. DANCe J040116.80+255752.2) was previously identifiedas a likely member of the Pleiades (age $\approx125$ Myr) based on photometryand astrometry, but its VL-G gravity classification and near-infraredphotometry imply a much younger age and thus point to Taurus membership. Wehave also discovered six M7-L1 dwarfs in outlying regions of Scorpius-Centauruswith photometry, proper motions, and low-gravity spectral signatures consistentwith membership. These objects have estimated masses $\approx$15-36 M$_{\rmJup}$. The M7 dwarf, PSO J237.1470-23.1489, shows excess mid-infrared fluximplying the presence of a circumstellar disk. Finally, we present catalogs ofPan-STARRS1 proper motions for low-mass members of Taurus and Upper Scorpiuswith median precisions of $\approx$3 mas yr$^{-1}$, including 67 objects withno previous proper motion and 359 measurements that improve on literaturevalues.

astrophysical journal/the astrophysical journal

A Search for L/T Transition Dwarfs With Pan-STARRS1 and WISE. III. Young  L Dwarf Discoveries and Proper Motion Catalogs in Taurus and  Scorpius-Centaurus