High-contrast H α imaging with Subaru/SCExAO + VAMPIRES

Taichi Uyama, Barnaby Norris, Nemanja Jovanovic, Julien Lozi, Peter Tuthill, Olivier Guyon, Tomoyuki Kudo, Jun Hashimoto, Motohide Tamura, Frantz Martinache

Research output: Contribution to journalArticlepeer-review

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 a1/410-3 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.

Original languageEnglish (US)
Article number045004
JournalJournal of Astronomical Telescopes, Instruments, and Systems
Volume6
Issue number4
DOIs
StatePublished - Oct 1 2020

Keywords

  • H α
  • data reduction
  • exoplanet
  • high contrast
  • optics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Control and Systems Engineering
  • Instrumentation
  • Astronomy and Astrophysics
  • Mechanical Engineering
  • Space and Planetary Science

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