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The fast-rising blue optical transient AT2018cow indicated unusual earlyphase characteristics unlike relatively better studied explosive transients.Its afterglow may be produced by either a relativistically beamed (jetted) orintrinsically luminous (non-jetted) ejecta and carries observational signaturesof the progenitor and environment. High resolution monitoring can distinguishbetween these scenarios and clarify the progenitor nature. We present very longbaseline interferometry (VLBI) observations of AT2018cow at 5 GHz involving 21radio telescopes from the European VLBI Network with five sessions spanning ~ 1year. With an astrometric precision up to 25 micro-arcseconds per epoch, therapidly fading compact milli arcsecond scale source is found to be non-jettedwith a proper motion of <= 0.15 mas/yr (0.14 c). This and a dense (numberdensity ~ 10^4 - 10^5/cm^3) magnetized environment (magnetic field strength >=0.84 G) are characteristic of a newly formed magnetar driven central engine,originating in the successful explosion of a low-mass star.

The nearby luminous transient AT2018cow: a magnetar formed in a sub-relativistically expanding non-jetted explosion