Searches for Shapiro delay in seven binary pulsars using the MeerKAT telescope

Precision timing of millisecond pulsars in binary systems enables observers to detect the relativistic Shapiro delay induced by space time curvature. When favourably aligned, this constraints be placed on component masses and system orientation. Here we present results campaigns seven observed with 64-antenna MeerKAT radio telescope that show evidence delay: PSRs~J0101$-$6422, J1101$-$6424, J1125$-$6014, J1514$-$4946, J1614$-$2230, J1732$-$5049, J1909$-$3744. Evidence for was found all systems, three orientations data quality enabled strong their orbital inclinations masses. For PSRs~J1125$-$6014, J1614$-$2230 J1909$-$3744, determined pulsar $M_{\rm p} = 1.68\pm 0.17 \, {\rm M_{\odot}} $, $1.94\pm 0.03 $ $1.45 \pm M_{\odot}}$, companion c} 0.33\pm 0.02 $0.495\pm 0.005 $0.205 0.003 respectively. This provides first independent confirmation PSR~J1614$-$2230's mass, one highest known. The delays measured J1732$-$5049 were only weak, could not provide interesting mass limits. Despite a large number being routinely timed, relatively few have accurate via delays. We use simulations is expected, formula assess how accurately can determined. also discuss correlation between spin period, anti-correlation recycled