A Protoplanet Candidate in the PDS 66 Disk Indicated by Silicon Sulfide Isotopologues
Tomohiro C. Yoshida et al 2026 ApJL 999 L22
A circumplanetary envelope surrounding a low-mass planet may be the cause of a source with emitting radius of 0.5–4 au embedded within the larger PDS 66 protoplanetary disk.