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Proceedings Paper

A polarimetric unit for HARPS-North at the Telescopio Nazionale Galileo: HANPO
Author(s): Francesco Leone; Massimo Cecconi; Rosario Cosentino; Adriano Ghedina; Marina Giarrusso; Manuel Gonzalez; Vania Lorenzi; Matteo Munari; Hector Perez Ventura; Luis Riverol; Jose San Juan; Salvatore Scuderi
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Paper Abstract

Usually observational astronomy is based on direction and intensity of radiation considered as a function of wavelength and time. Despite the polarisation degree of radiation provides information about asymmetry, anisotropy and magnetic fields within the radiative source or in the medium along the line of sight, it is commonly ignored. Because of the importance of high resolution spectropolarimetry to study a large series of phenomena related to the interaction of radiation with matter, as in stellar atmospheres or more generally stellar envelopes, we designed and built a dual beam polarimeter for HARPS-N that is in operation at the Telescopio Nazionale Galileo. Since the polarisation degree is measured from the combination of a series of measurements and accuracy is limited by the instrumental stability, just the great stability (0.6 m/s) and spectral resolution (R=115000) of the HARPS-N spectrograph should result in an accuracy in the measurements of Stokes parameters as small as 0.01%. Here we report on the design, realization, assembling, aligning and testing of the polarimetric unit whose first light is planned in August 2014.

Paper Details

Date Published: 28 July 2014
PDF: 8 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91472F (28 July 2014); doi: 10.1117/12.2054757
Show Author Affiliations
Francesco Leone, Univ. degli Studi di Catania (Italy)
INAF - Osservatorio Astrofisico di Catania (Italy)
Massimo Cecconi, INAF - Fundación Galileo Galilei (Spain)
Rosario Cosentino, INAF - Fundación Galileo Galilei (Spain)
Adriano Ghedina, INAF - Fundación Galileo Galilei (Spain)
Marina Giarrusso, Univ. degli Studi di Catania (Italy)
INAF - Osservatorio Astrofisico di Catania (Italy)
Manuel Gonzalez, INAF - Fundación Galileo Galilei (Spain)
Vania Lorenzi, INAF - Fundación Galileo Galilei (Spain)
Matteo Munari, INAF - Osservatorio Astrofisico di Catania (Italy)
Hector Perez Ventura, INAF - Fundación Galileo Galilei (Spain)
Luis Riverol, INAF - Fundación Galileo Galilei (Spain)
Jose San Juan, INAF - Fundación Galileo Galilei (Spain)
Salvatore Scuderi, INAF - Osservatorio Astrofisico di Catania (Italy)

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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