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Proceedings Paper

Sky background subtraction with fiber-fed spectrographs
Author(s): M. Puech; M. Rodrigues; Y. Yang; H. Flores; F. Royer; K. Disseau; T. Gonçalves; F. Hammer; M. Cirasuolo; C. J. Evans; G. Li Causi; R. Maiolino; C. Melo
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Paper Abstract

Fiber-fed spectrographs can now have throughputs equivalent to slit spectrographs. However, the sky subtraction accuracy that can be reached on such instruments has often been pinpointed as one of their major issues, in relation to difficulties in scattered light and flat-field corrections or throughput losses associated with fibers. Using technical time observations with FLAMES-GIRAFFE, two observing techniques, namely dual staring and cross beam switching modes, were tested and the resulting sky subtraction accuracy reached in both cases was quantified. Results indicate that an accuracy of 0.6% on the sky subtraction can be reached, provided that the cross beam switching mode is used. This is very encouraging regarding the detection of very faint sources with future fiber-fed spectrographs such as VLT/MOONS or E-ELT/MOSAIC.

Paper Details

Date Published: 28 July 2014
PDF: 7 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91476L (28 July 2014); doi: 10.1117/12.2055137
Show Author Affiliations
M. Puech, GEPI, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)
M. Rodrigues, GEPI, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)
European Southern Observatory (Chile)
Y. Yang, GEPI, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)
H. Flores, GEPI, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)
F. Royer, GEPI, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)
K. Disseau, GEPI, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)
T. Gonçalves, Univ. Federal do Rio de Janeiro (Brazil)
F. Hammer, GEPI, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)
M. Cirasuolo, SUPA, Institute for Astronomy, Univ. of Edinburgh, Royal Observatory (United Kingdom)
C. J. Evans, UK Astronomy Technology Ctr. (United Kingdom)
G. Li Causi, INAF - Osservatorio Astronomico di Roma (Italy)
R. Maiolino, Univ. of Cambridge (United Kingdom)
C. Melo, European Southern Observatory (Chile)


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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