High-contrast Hα imaging with Subaru/SCExAO + VAMPIRES

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

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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.

Additional Information

© 2020 The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI. Received: 28 May 2020; Accepted: 19 October 2020; Published: 9 November 2020. We would like to thank the anonymous referees for their constructive comments and suggestions to improve the quality of the paper. The authors are grateful to Steven P. Bos for helping us calculate the Strehl ratios. This research is based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatories of Japan. We acknowledge with thanks the variable star observations from the AAVSO International Database contributed by observers worldwide and used in this research. This research has made use of NASA's Astrophysics Data System Bibliographic Services. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. TU acknowledges JSPS overseas research fellowship and JSPS overseas challenge program for young researchers. The development of SCExAO was supported by JSPS (Grant-in-Aid for Research #23340051, #26220704, and #23103002), Astrobiology Center of NINS, Japan, the Mt Cuba Foundation, and the director's contingency fund at Subaru Telescope. The authors wish to acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.

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