A new Virtual Interferometer technique for Extrasolar Planet Searches

Details A new Virtual Interferometer technique for Extrasolar Planet Searches A new Virtual Interferometer technique for Extrasolar Planet Searches

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.0302m&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #03.02; Bulletin of the American Astronomical Society, Vol. 33, p.1303

Astronomy and Astrophysics

Astronomy

Scientific paper

A new instrument has been designed and developed at Penn State for high precision Doppler radial velocity measurements using the Moire fringe technique. The Moire fringes generated by superimposing a digital comb on two dimensional stellar spectra allow us to translate Doppler shifts in the dispersion direction into much larger Moire fringe shifts (3-5 times larger) in the slit direction. The magnification of Moire fringes and a much simpler phase shift of a sinosoidal pattern enable precision Doppler velocity measurements. This prototype instrument using a medium resolution spectrograph( R 10,000) can provide much higher throughput (5-10 times more) than conventional high resolution echelle spectrographs. We have demonstrated velocity measurements in the 30 m/s range with this virtual interferometer and further work will allow us to improve the accuracy to 5-10 m/s. The Virtual Interferometer will fill a niche in the 5-50 m/s range allowing a much deeper survey of stellar objects. This can be important in setting constraints on SIM grid stars as well as finding companions around fainter stars.

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