Precision speckle interferometry with CMOS detector
arXiv:2409.10249 · doi:10.1117/12.3018430
Abstract
Speckle polarimeter (SPP) is a facility instrument of the 2.5-m telescope of the Caucasian Mountain Observatory of SAI MSU. By design it is a combination of a speckle interferometer and a dual--beam polarimeter. In 2022 we performed a major upgrade of the instrument. New version of the instrument features Hamamatsu ORCA-Quest qCMOS C15550-20UP, having subelectron readout noise, as a main detector, as opposed to EMCCD Andor iXon 897 used in previous version. Optical distortions present in the instrument are considered as they directly affect the accuracy of the speckle interferometric astrometric measurements of binary stars. We identified the Atmospheric Dispersion Compensator (ADC) as the main source of distortions which are not constant and depend on the rotational angles of ADCs prisms. Distortions are estimated using internal calibration light source and multiple binary stars measurements. Method for their correction is developed. Flux ratio estimates are subject to CMOS-specific negative factors: spatially correlated noise and flux-dependent pixel-to-pixel sensitivity difference. We suggest ways to mitigate these factors. The use of speckle transfer function measured using a reference star further improves flux ratio estimation performance. We discuss the precision of the estimates of position angle, separation and flux ratio of binary stars.
arXiv comment10 pages, 7 figures, Paper 13095-98 from SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan
References in corpus (12)
- Understanding The Effects Of Stellar Multiplicity On The Derived Planet Radii From Transit Surveys: Implications for Kepler, K2, and TESS
- SOAR TESS Survey. I: Sculpting of TESS planetary systems by stellar companions
- Ten years of speckle interferometry at SOAR
- Discovery of an equal-mass "twin" binary population reaching 1000+ AU separations
- Measuring the Recoverability of Close Binaries in Gaia DR2 with the Robo-AO Kepler Survey
- JWST Noise Floor I: Random Error Sources in JWST NIRCam Time Series
- Speckle Interferometry with CMOS Detector
- Another Shipment of Six Short-Period Giant Planets from TESS
- Unresolved Binaries and Multiples in the Intermediate Mass Range in open clusters: Pleiades, Alpha Per, Praesepe, and NGC 1039
- The triple system Zeta Aquarii
- Confirmation and characterisation of three giant planets detected by TESS from the FIES/NOT and Tull/McDonald spectrographs
- Orbital parameters and activity of ZZ Tau -- a low mass young binary with circumbinary disc