Three microlensing planets with no caustic-crossing features
  We search for microlensing planets with signals exhibiting no
caustic-crossing features, considering the possibility that such signals may be
missed due to their weak and featureless nature. For this purpose, we reexamine
the lensing events found by the KMTNet survey before the 2019 season. From this
investigation, we find two new planetary lensing events, KMT-2018-BLG-1976 and
KMT-2018-BLG-1996. We also present the analysis of the planetary event
OGLE-2019-BLG-0954, for which the planetary signal was known, but no detailed
analysis has been presented before. We identify the genuineness of the
planetary signals by checking various interpretations that can generate
short-term anomalies in lensing light curves. From Bayesian analyses conducted
with the constraint from available observables, we find that the host and
planet masses are $(M_1, M_2)\sim (0.65~M_\odot, 2~M_{\rm J})$ for
KMT-2018-BLG-1976L, $\sim (0.69~M_\odot, 1~M_{\rm J})$ for KMT-2018-BLG-1996L,
and $\sim (0.80~M_\odot, 14~M_{\rm J})$ for OGLE-2019-BLG-0954L. The estimated
distance to OGLE-2019-BLG-0954L, $3.63^{+1.22}_{-1.64}$~kpc, indicates that it
is located in the disk, and the brightness expected from the mass and distance
matches well the brightness of the blend, indicating that the lens accounts for
most of the blended flux. The lens of OGLE-2019-BLG-0954 could be resolved from
the source by conducting high-resolution follow-up observations in and after
2024.
