PSR J0437-4715: The Argentine Institute of Radioastronomy 2019-2020
  Observational Campaign
  The Argentine Institute of Radio astronomy (IAR) is equipped with two
single-dish 30-m radio antennas capable of performing daily observations of
pulsars and radio transients in the southern hemisphere at 1.4 GHz. We aim to
contribute to pulsar timing studies related to short time-scale interstellar
scintillation and searches for sources of continuous gravitational waves. We
performed high-cadence (almost daily) and long-duration observations of the
bright millisecond pulsar J0437$-$4715 for over a year, gathering more than 700
hours of good-quality data with timing precision better than 1~$\mu$s. We
characterize the white and red timing noise in IAR's observations of
J0437$-$4715. We quantify the effects of scintillation in this data set and
perform single pulsar searches of continuous gravitational waves, setting
constraints in the nHz--$\mu$Hz frequency range. We demonstrate IAR's potential
for performing pulsar monitoring in the 1.4 GHz radio band for long periods of
time with a daily cadence. In particular, we conclude that the ongoing
observational campaign of the millisecond pulsar J0437$-$4715 can contribute to
increase the sensitivity of the existing pulsar timing arrays.
