  In support of the Astrobiology Science Strategy, this whitepaper outlines
some key technology challenges pertaining to the remote search for life in
exoplanetary systems. Finding evidence for life on rocky planets outside of our
solar system requires new technical capabilities for the key measurements of
spectral signatures of biosignature gases, and of planetary mass measurement.
Spectra of Earth-like planets can be directly measured in reflected stellar
light in the visible band or near-infrared using a factor 1e-10 starlight
suppression with occulters, either internal (coronagraph) or external
(starshade). Absorption and emission (reflected and thermal) spectra can be
obtained in the mid-infrared of rocky planets transiting M-dwarfs via
spectroscopy of the transit and secondary eclipse, respectively. Mass can be
measured from the star's reflex motion, the reflex motion of a star, via either
precision radial velocity methods or astrometry. Several technology gaps must
be closed to provide astronomers the necessary capabilities to obtain these key
measurements for small planets orbiting within the predicted temperate zones
around nearby stars. These involved performance improvements, in some cases,
1-2 orders of magnitude from state-of-the-art or involve performances never
demonstrated. The technologies advancing to close these gaps have been
identified through the NASA Exoplanet Exploration Program's annual Technology
Selection and Prioritization Process in collaboration with the larger exoplanet
science and technology community
