Spectral astrometry mission for planets detection

David J. Erskine; Jerry Edelstein

doi:10.1117/12.460726

26 February 2003 Spectral astrometry mission for planets detection

David J. Erskine, Jerry Edelstein

Proceedings Volume 4852, Interferometry in Space; (2003) https://doi.org/10.1117/12.460726
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

The Spectral Astrometry Mission is a space-mission concept that uses simultaneous, multiple-star differential astrometry to measure exo-solar planet masses. The goal of SAM is to measure the reflex motions of hundreds of nearby (~50 pc) F, G and K stars, relative to adjacent stars, with a resolution of 2.5 micro-arcsec. SAM is a new application of Spectral Interferometry (SI), also called Externally Dispersed Interferometry (EDI), that can simultaneously measure the angular difference between the target and multiple reference stars. SI has demonstrated the ability to measure a λ/20,000 white-light fringe shift with only lambda/3 baseline control. SAM's structural stability and compensation requirements are therefore dramatically reduced compared to existing long-arm balanced-arm interferometric astrometry methods. We describe the SAM's mission concept, long-baseline SI astrometry method, and technical challenges to achieving the mission.

Citation Download Citation

David J. Erskine and Jerry Edelstein "Spectral astrometry mission for planets detection", Proc. SPIE 4852, Interferometry in Space, (26 February 2003); https://doi.org/10.1117/12.460726

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