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Proceedings Paper

ESPRESSO front end exposure meter: a chromatic approach to radial velocity correction
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Paper Abstract

This paper presents the Espresso Exposure Meter (EM) implementation. ESPRESSO, the Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations, will be installed on ESOs Very Large Telescope (VLT). The light coming from the Telescope through a Coude Focus of all the Four Telescope Units (UTs) will be collected by the Front End Unit that provides Field and Pupil stabilisation and injects the beams into the Spectrograph fibers. An advanced Exposure Meter system will be used to correct Radial Velocity (RV) obtained from the scientific spectrum for the Earth relative motion. In this work we will present the performance of an innovative concept for the Exposure Meter system based on a Charge Coupled Device (CCD) with a chromatic approach for the calculation of the Mean Time of Exposure (MTE). The MTE is a fundamental quantity used for the correction of RV for the Earth relative motion during exposure. In particular, splitting the light in different chromatic channels on the CCD, we will probe for potential chromatic effects on the calculation of the MTE in each channel and how they could be used in order to perform the correction of RV. The paper is accompanied by a fully described numerical analysis that keeps into view a key performance evaluation for different stellar spectral types (B to M spectral main sequence classes).

Paper Details

Date Published: 28 July 2014
PDF: 18 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91478K (28 July 2014); doi: 10.1117/12.2056406
Show Author Affiliations
Marco Landoni, INAF - Osservatorio Astronomico di Brera (Italy)
Marco Riva, INAF - Osservatorio Astronomico di Brera (Italy)
Francesco Pepe, Observatoire de Genève (Switzerland)
Paolo Conconi, INAF - Osservatorio Astronomico di Brera (Italy)
Filippo M. Zerbi, INAF - Osservatorio Astronomico di Brera (Italy)
Alexandre Cabral, Univ. de Lisboa (Portugal)
Stefano Cristiani, INAF - Osservatorio Astronomico di Trieste (Italy)
Denis Megevand, Observatoire de Genève (Switzerland)

Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)

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