JWST Found a 2.8-Jupiter-Mass Planet Inside 50 AU

JWST/NIRCam detected a source at signal-to-noise ratio about 17.5 and a projected separation near 14 astronomical units from the young M dwarf RX J0534.0-0221. A second observation with LBTI/LMIRCam 16 months later favored common proper motion over a background interloper at six to seven sigma. Hot-start models put the object near 2.8 Jupiter masses and 674 kelvin at an age of 18–26 million years. The same system shows a debris disk with a peak-density radius near 79 AU; formation history remains to be determined.