Instrument #

Overview #

The RISTRETTO instrument will be composed of 2 main components:

A spectrograph, with 7 spaxels,
an XAO front end with a coronagraph.

The focal plane is paved hexagonally. The lateral spaxels are centered at 2λ/d. At once one cannot cover the full ring around the star. One need a second exposure at 30° offset

To deliver its full performance the system should be installed on an 8m class telescope. The scientific bandwidth is 620-840 nm

The whole instrument is designed to enable the detection of the reflected light from Proxima b