High-contrast Hα imaging with Subaru/SCExAO + VAMPIRES
Abstract
We present the current status of Hα high-contrast imaging observations with Subaru/Subaru Coronagraphic Extreme Adaptive Optics + VAMPIRES. Our adaptive optics correction at optical wavelengths in combination with (double) spectral differential imaging (SDI) and angular differential imaging (ADI) was capable of resolving a ring feature around omi Cet and detect the Hα counterpart of jet around RY Tau. We tested the post-processing by changing the order of ADI and SDI and both of the contrast limits achieved ∼10 - 3 to 5 × 10 - 4 at 0.3″, which is comparable to other Hα high-contrast imaging instruments in the Southern Hemisphere such as very large telescope (VLT)/spectro-polarimetric high-contrast exoplanet research, VLT/MUSE, and Magellan AO. Current wavefront sensing and adaptive optics correction at optical wavelengths empirically depend on airmass, and Subaru/VAMPIRES provide great opportunities for Hα high-contrast imaging for Northern Hemisphere targets.
- Publication:
-
Journal of Astronomical Telescopes, Instruments, and Systems
- Pub Date:
- October 2020
- DOI:
- 10.1117/1.JATIS.6.4.045004
- arXiv:
- arXiv:2008.10780
- Bibcode:
- 2020JATIS...6d5004U
- Keywords:
-
- Astrophysics - Instrumentation and Methods for Astrophysics;
- Astrophysics - Earth and Planetary Astrophysics;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 30 pages, 14 figures, accepted for publication in JATIS