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MWC 758 is a young star hosting a spiral protoplanetary disk. The spirals arelikely companion-driven, and two previously-identified candidate companionshave been identified -- one at the end the Southern spiral arm at ~0.6 arcsec,and one interior to the gap at ~0.1 arcsec. With JWST/NIRCam, we provide newimages of the disk and constraints on planets exterior to ~1". We detect thetwo-armed spiral disk, a known background star, and a spatially resolvedbackground galaxy, but no clear companions. The candidates that have beenreported are at separations that are not probed by our data with sensitivitysufficient to detect them -- nevertheless, these observations place new limitson companions down to ~2 Jupiter-masses at ~150 au and ~0.5 Jupiter masses at~600 au. Owing to the unprecedented sensitivity of JWST and youth of thetarget, these are among the deepest mass-detection limits yet obtained throughdirect imaging observations, and provide new insights into the system'sdynamical nature.

JWST/NIRCam Imaging of Young Stellar Objects. I. Constraints on Planets Exterior to The Spiral Disk Around MWC 758