Confusion in Direct Imaging of Earth-Clones

Details Confusion in Direct Imaging of Earth-Clones Confusion in Direct Imaging of Earth-Clones

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21642502p&link_type=abstract

American Astronomical Society, AAS Meeting #216, #425.02; Bulletin of the American Astronomical Society, Vol. 41, p.838

Astronomy and Astrophysics

Astronomy

Scientific paper

It is an important and necessary goal to image Earth-clones and to further study atmospheres of those exoplanets. It is, however, arguable whether direct imaging can discover and characterize Earth-like planets alone, or if direct imaging definitely needs astrometric discoveries of Earth-clones first. Several proposed imaging missions for searching Earth-clones are evaluated in this work. Challenging issues in direct imaging of Earth-clones are discussed. In particular, confusing issues in direct imaging coming from background objects, distant M, T, L types of stars, faint brown dwarfs and multiple planets are investigated. Also, the impacts of zodiacal and exozodiacal dust clouds on signal-to-noise ratios of direct imaging are analyzed. There is no doubt that the best strategy to explore Earth-clones uses discoveries of Earth-clones by an astrometry mission first, which is then followed by an imaging mission to improve Earth-clones’ orbital parameters and to further characterize their physical parameters. We believe that the synergy of direct imaging of Earth-clones with astrometry is the most effective observation strategy to search for and investigate Earth-clones in the foreseeable future.

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