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Millisecond pulsars (MSPs) represent nearly half of the more than 160currently known $\gamma$-ray pulsars detected by the Large Area Telescope onthe \textit{Fermi} satellite, and a third of all known MSPs are seen in$\gamma$ rays. The least energetic $\gamma$-ray MSPs enable us to probe theso-called deathline for high-energy emission, i.e., the spin-down luminositylimit under which pulsars (PSRs) cease to produce detectable high-energyradiation. Characterizing the MSP luminosity distribution helps to determinetheir contribution to the Galactic diffuse $\gamma$-ray emission. We made useof the high-quality pulsar timing data recorded at the Nan\c{c}ay RadioTelescope over several years to characterize the properties of a selection ofMSPs. For one of the pulsars, the dataset was complemented with WesterborkSynthesis Radio Telescope observations. The rotation ephemerides derived fromthis analysis were also used to search the LAT data for new $\gamma$-ray MSPs.For the MSPs considered in this study, we obtained new transverse proper motionmeasurements or updated the existing ones, and placed new distance constraintsfor some of them, with four new timing parallax measurements. We discoveredsignificant GeV $\gamma$-ray signals from four MSPs, i.e., PSRs J0740+6620,J0931$-$1902, J1455$-$3330, and J1730$-$2304. The latter is now the leastenergetic $\gamma$-ray pulsar found to date. Despite the improved $\dot E$ and$L_\gamma$ estimates, the relationship between these two quantities remainsunclear, especially at low $\dot E$ values.

The gamma-ray millisecond pulsar deathline, revisited - New velocity and distance measurements