Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dda....41.0916u&link_type=abstract
American Astronomical Society, DDA meeting #41, #9.16; Bulletin of the American Astronomical Society, Vol. 41, p.937
Astronomy and Astrophysics
Astronomy
Scientific paper
Exoplanets are now being discovered by a variety of observational techniques, including radial velocity, transits, microlensing and in a few examples, direct imaging. Each technique has distinct advantages and disadvantages, depending on the planet or system parameters of interest. The exoplanet parameter space is very large, and only partially explored. Precision astrometry has yet to contribute significantly, due to the difficulty of achieving the necessary precision from the ground. Space astrometry of exoplanets will begin with Gaia, which will explore Jupiter-mass planet populations. The Space Interferometry Mission (SIM Lite) will provide the precision needed to do a thorough survey of the local neighborhood for planets down to Earth mass, and measure their masses and orbits. In this poster we show how astrometry opens up a critical part of the exoplanet parameter space: low-mass planets around nearby stars. This is of particular significance because these are the planets for which direct imaging and spectroscopy will provide the most detailed understanding of planets that may have Earth-like characteristics.
Traub Wesley A.
Unwin Stephen C.
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