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CASPER: Concordia Atmospheric SPectroscopyof Emitted Radiation

Published online by Cambridge University Press:  05 January 2006

M. Giard ,
F. Casoli ,
F. Paletou ,
M. De Petris ,
A. Catalano ,
S. De Gregori ,
L. Lamagna ,
V. Lattanzi ,
G. Luzzi  and
R. Maoli
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M. De Petris*
Affiliation:
Dipartimento di Fisica, Università ”La Sapienza”, P.le A. Moro 2, 00185 Rome, Italy
A. Catalano
Affiliation:
Dipartimento di Fisica, Università ”La Sapienza”, P.le A. Moro 2, 00185 Rome, Italy
S. De Gregori
Affiliation:
Dipartimento di Fisica, Università ”La Sapienza”, P.le A. Moro 2, 00185 Rome, Italy
L. Lamagna
Affiliation:
Dipartimento di Fisica, Università ”La Sapienza”, P.le A. Moro 2, 00185 Rome, Italy
V. Lattanzi
Affiliation:
Dipartimento di Fisica, Università ”La Sapienza”, P.le A. Moro 2, 00185 Rome, Italy
G. Luzzi
Affiliation:
Dipartimento di Fisica, Università ”La Sapienza”, P.le A. Moro 2, 00185 Rome, Italy
R. Maoli
Affiliation:
Dipartimento di Fisica, Università ”La Sapienza”, P.le A. Moro 2, 00185 Rome, Italy
A. Melchiorri
Affiliation:
Dipartimento di Fisica, Università ”La Sapienza”, P.le A. Moro 2, 00185 Rome, Italy
F. Melchiorri
Affiliation:
Dipartimento di Fisica, Università ”La Sapienza”, P.le A. Moro 2, 00185 Rome, Italy
G. Savini
Affiliation:
Dipartimento di Fisica, Università ”La Sapienza”, P.le A. Moro 2, 00185 Rome, Italy
G. G. Vetrani
Affiliation:
Dipartimento di Fisica, Università ”La Sapienza”, P.le A. Moro 2, 00185 Rome, Italy
E. S. Battistelli
Affiliation:
Instituto de Astrofisica de Canarias C/ Via Lactea, s/n 38200 La Laguna, Tenerife, Spain
L. Valenziano
Affiliation:
CNR/IASF-Sezione di Bologna, via P. Gobetti 101, 40129 Bologna, Italy
N. Mandolesi
Affiliation:
CNR/IASF-Sezione di Bologna, via P. Gobetti 101, 40129 Bologna, Italy
F. Villa
Affiliation:
CNR/IASF-Sezione di Bologna, via P. Gobetti 101, 40129 Bologna, Italy
F. Cuttaia
Affiliation:
CNR/IASF-Sezione di Bologna, via P. Gobetti 101, 40129 Bologna, Italy
P. A.R. Ade
Affiliation:
School of Physics and Astronomy, University of Wales, Cardiff, UK
P. Mauskopf
Affiliation:
School of Physics and Astronomy, University of Wales, Cardiff, UK
A. Orlando
Affiliation:
School of Physics and Astronomy, University of Wales, Cardiff, UK
P. Encrenaz
Affiliation:
LERMA, Observatoire de Paris, Paris, France
J. R. Pardo
Affiliation:
Inst. Estructura de la Materia, Dpto. Fisica Molecular, Madrid, Spain
J. Cernicharo
Affiliation:
Inst. Estructura de la Materia, Dpto. Fisica Molecular, Madrid, Spain
*
[email protected]
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Abstract

CASPER (Concordia Atmospheric SPectroscopy of Emitted Radiation)is a spectrometer proposed for installation at Dome C, devoted tomeasurements of atmospheric emission in the spectral regionbetween 180 μm and 3 mm (3–55 cm-1). Thisinstrument will be able to perform continuous spectral sampling atdifferent altitudes at angular scales of ~1°. From therecorded data it is possible to extract atmospheric transmittancewithin 1% in the whole wide operating band, together with watervapour content and O2 and O3 concentrations. CASPER willallow us to characterize the site for future FIR/mm telescopes.Atmospheric data recorded by CASPER will allow for correction ofastrophysical and cosmological observations without the need fortelescope-specific procedures and further loss of observation timewith more precision in the observations themselves. Calibration ofground-based telescopes on known sky sources is strongly affectedby atmospheric absorption. CASPER has this as its primary goal.The spectrometer is based on a Martin-Puplett interferometer. Twodata sampling solutions will be performed: phase modulation &fast scan strategy. Sky radiation is collected towards theinterferometer by an optical setup that allows the field of view,to explore the full 0° ÷ 90° range of elevation angles. Witha low spurious polarization instrument, monitoring of polarizedatmospheric contribution will be possible.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 14: Dome C Astronomy and Astrophysics Meeting , 2005 , pp. 233 - 238
Copyright
© EAS, EDP Sciences, 2005

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