The Tunable Filter Imager (TFI) of the JWST

Details The Tunable Filter Imager (TFI) of the JWST The Tunable Filter Imager (TFI) of the JWST

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010lyot.confe..52l&link_type=abstract

Proceedings of the conference In the Spirit of Lyot 2010: Direct Detection of Exoplanets and Circumstellar Disks. October 25 -

Physics

Scientific paper

The Tunable Filter Imager (TFI) is a science camera packaged within the Fine Guidance Sensor module of the JWST, which is provided by the Canadian Space Agency. TFI uses of a low-order Fabry-Perot etalon to perform narrow-band imaging at any wavelength in the 1.6-2.6 μm and 3.2-4.9 μm ranges; the spectral resolving power varies between 80 and 140. TFI is equipped with a classical Lyot coronagraph that provides a contrast improvement of approximately 2.5 mag for angular separations above 0.3". TFI is also equipped with a non-redundant aperture mask (NRM) in its pupil wheel; at a wavelength of 4.6 μm, the NRM provides an angular resolution of 75 mas and reaches a contrast of ∼10 mag. This regime of contrast and angular separation is unique to the TFI/NRM onboard JWST. The coronagraphic, spectral differential imaging and aperture masking interferometry capabilities of TFI provide the high contrast and high angular resolution that are essential for exoplanet detection; the tunable filter then allows spectral characterization at R∼100. In this talk I will present a more detailed overview of the TFI and show some examples that illustrate its capabilities in the context of exoplanet search and characterization.

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