DOI

https://handle.test.datacite.org/10.82017/3arh-pc16

Project

RM019

Title

e-EVN: EN011E, EC095, RSY10, RM019

Abstract

Swift J1727.8-1613 is a newly discovered black hole candidate X-ray binary, one of the brightest such sources ever observed, and likely among the closest (a few kpc at most). After spending several weeks in a very stable hard state following its discovery in August, on September 19th Swift J1727.8-1613 showed at least two short transitions to the soft state and back, which are believed to be connected with the the launch of relativistic jets. One such transition should have been covered by our original EVN observation on 26 September 2023 (RM018). We propose a 6-hour, phase-referenced 6-cm observation of the target, to be performed during the upcoming e-EVN session on 4 October. Combined with our previous data, and coordinated with other X-ray and radio observations, this experiment will determine the dependence of jet properties on the changing accretion flow, and track the motions of any transient jet ejecta that may be launched.