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High-contrast, High-angular-resolution Optical Speckle Imaging: Uncovering Hidden Stellar Companions
- Source :
- The Astronomical Journal, Vol 167, Iss 6, p 258 (2024)
- Publication Year :
- 2024
- Publisher :
- IOP Publishing, 2024.
-
Abstract
- We explore the possibility of detecting very faint, very close-in stellar companions using large aperture ground-based telescopes and the technique of optical speckle imaging. We examine the state of high-angular-resolution speckle imaging and contrast levels being achieved using current speckle cameras on the Gemini 8 m telescope. We then explore the use of the modern image reconstruction technique—multiframe blind deconvolution (MFBD)—applied to speckle imaging from the Gemini 8 m telescope. We show that MFBD allows us to measure the flux ratio of the imaged stars to high accuracy and the reconstructed images yield higher precision astrometry. Both of these advances provide a large refinement in the derived astrophysical parameters compared with current Fourier techniques. MFBD image reconstructions reach contrast levels of ∼5 × 10 ^−3 , near the diffraction limit, to ∼10 ^−4 about 1.″0 away. At these deep contrast levels with angular limits starting near the 8 m diffraction limit (∼20 mas), most stellar companions to a solar-like stars can be imaged in the optical to near-IR bandpass (320–1000 nm). “To Xanadu we go...” —adapted from S. T. Coleridge.
- Subjects :
- Speckle interferometry
Astronomical instrumentation
Binary stars
Astronomy
QB1-991
Subjects
Details
- Language :
- English
- ISSN :
- 15383881
- Volume :
- 167
- Issue :
- 6
- Database :
- Directory of Open Access Journals
- Journal :
- The Astronomical Journal
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.36963955b1bc41dda3de6b4817b1ba8d
- Document Type :
- article
- Full Text :
- https://doi.org/10.3847/1538-3881/ad3df2