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Wolf 359 (CN Leo, GJ 406, Gaia DR3 3864972938605115520) is a low-mass star inthe fifth-closest neighboring system (2.41 pc). Because of its relative youthand proximity, Wolf 359 offers a unique opportunity to study substellarcompanions around M stars using infrared high-contrast imaging and radialvelocity monitoring. We present the results of Ms-band (4.67 $\mu$m) vectorvortex coronagraphic imaging using Keck-NIRC2 and add 12 Keck-HIRES velocitiesand 68 MAROON-X velocities to the radial velocity baseline. Our analysisincorporates these data alongside literature radial velocities from CARMENES,HARPS, and Keck-HIRES to rule out the existence of a close ($a < 10$ AU)stellar or brown dwarf companion and the majority of large gas-giantcompanions. Our survey does not refute or confirm the long-period radialvelocity candidate Wolf 359 b ($P\sim2900$ d) but rules out the candidate'sexistence as a large gas-giant ($>4 M_{jup}$) assuming an age of younger than 1Gyr. We discuss the performance of our high-contrast imaging survey to aidfuture observers using Keck-NIRC2 in conjunction with the vortex coronagraph inthe Ms-band and conclude by exploring the direct imaging capabilities with JWSTto observe Jupiter-mass and Neptune-mass planets around Wolf 359.

A Wolf 359 in sheep's clothing: Hunting for substellar companions in the  fifth-closest system using combined high-contrast imaging and radial velocity  analysis