Volume 656, December 2021
|Number of page(s)||11|
|Published online||09 December 2021|
Accurate sky signal reconstruction for ground-based spectroscopy with kinetic inductance detectors
Aix Marseille Univ., CNRS, CNES, LAM, Marseille, France
2 Univ. Grenoble Alpes, CNRS, LPSC/IN2P3, 38000 Grenoble, France
3 Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France
4 Instituto de Astrofísica de Canarias, C/Vía Láctea, 38205 La Laguna, Tenerife, Spain
5 Universidad de La Laguna, Dept. Astrofísica, 38206 La Laguna, Tenerife, Spain
6 Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Roma, Italy
7 Centro de Astrobiología (CSIC-INTA), Torrejón de Ardoz, 28850 Madrid, Spain
8 Astronomy Instrumentation Group, University of Cardiff, The Parade CF24 3AA, UK
9 Univ. Grenoble Alpes, CNRS, IPAG, 38400 Saint Martin d’Hères, France
Accepted: 7 September 2021
Context. Wide-field spectrometers are needed to deal with current astrophysical challenges that require multiband observations at millimeter wavelengths. An example of these is the KIDs Interferometer Spectrum Survey (KISS), which uses two arrays of kinetic inductance detectors (KIDs) coupled to a Martin-Puplett interferometer (MPI). KISS has a wide instantaneous field of view (1 deg in diameter) and a spectral resolution of up to 1.45 GHz in the 120–180 GHz electromagnetic band. The instrument is installed on the 2.25 m Q-U-I JOint TEnerife telescope at the Teide Observatory (Tenerife, Canary Islands), at an altitude of 2395 m above sea level.
Aims. This work presents an original readout modulation method developed to improve the sky signal reconstruction accuracy for types of instruments for which a fast sampling frequency is required, both to remove atmospheric fluctuations and to perform full spectroscopic measurements on each sampled sky position.
Methods. We first demonstrate the feasibility of this technique using simulations. We then apply such a scheme to on-sky calibration.
Results. We show that the sky signal can be reconstructed to better than 0.5% for astrophysical sources, and to better than 2% for large background variations such as in “skydip”, in an ideal noiseless scenario. The readout modulation method is validated by observations on-sky during the KISS commissioning campaign.
Conclusions. We conclude that accurate photometry can be obtained for future KID-based interferometry using the MPI.
Key words: instrumentation: detectors / techniques: spectroscopic / large-scale structure of Universe
© A. Fasano et al. 2021
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