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2018PASP..130a4504S - Publ. Astron. Soc. Pac., 130, part no 1, 4504-14504 (2018/January-0)

Precision time-series photometry in the thermal infrared with a "wall-eyed" pointing mode at the Large Binocular telescope.

SPALDING E., HINZ P., SKEMER A., HILL J., BAILEY V.P. and VAZ A.

Abstract (from CDS):

Time-series photometry taken from ground-based facilities is improved with the use of comparison stars due to the short timescales of atmospheric-induced variability. However, the sky is bright in the thermal infrared (3-5 µm), and the correspondingly small fields of view of available detectors make it highly unusual to have a calibration star in the same field as a science target. Here, we present a new method of obtaining differential photometry by simultaneously imaging a science target and a calibrator star, separated by <=2 amin, onto a 10 x 10 asec2 field-of-view detector. We do this by taking advantage of the Large Binocular Telescope's (LBT) unique binocular design to point the two co-mounted telescopes apart and simultaneously obtain both targets in three sets of observations.
Result. indicate that the achievable scatter in LS-band (λ{c}=3.3µm) is at the percent level for bright targets and possibly better with heavier sampling and characterization of the systematics.

Abstract Copyright: © 2017. The Astronomical Society of the Pacific. All rights reserved.

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2020.06.01-16:15:22

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