Precision time-series photometry in the thermal infrared with a ‘wall-eyed’ pointing mode at the large binocular telescope

Eckhart Spalding, Phil Hinz, Andrew Skemer, John Hill, Vanessa P. Bailey, Amali Vaz

Research output: Contribution to journalArticlepeer-review

Abstract

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 10×10 asec2 field-of-view detector. We do this by taking advantage of the LBT’s unique binocular design to point the two co-mounted telescopes apart and simultaneously obtain both targets in three sets of observations. Results indicate that the achievable scatter in LS-band (λc = 3.3 µm) is at the percent level for bright targets, and possibly better with heavier sampling and characterization of the systematics.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Dec 18 2017

Keywords

  • Instrumentation: adaptive optics —instrumentation: miscellaneous
  • Methods: observational
  • Techniques: photometric
  • Telescopes: individual (LBT)

ASJC Scopus subject areas

  • General

Fingerprint Dive into the research topics of 'Precision time-series photometry in the thermal infrared with a ‘wall-eyed’ pointing mode at the large binocular telescope'. Together they form a unique fingerprint.

Cite this