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High-contrast Hα imaging with Subaru/SCExAO + VAMPIRES

Uyama, Taichi and Norris, Barnaby and Jovanovic, Nemanja and Lozi, Julien and Tuthill, Peter and Guyon, Olivier and Kudo, Tomoyuki and Hashimoto, Jun and Tamura, Motohide and Martinache, Frantz (2020) High-contrast Hα imaging with Subaru/SCExAO + VAMPIRES. Journal of Astronomical Telescopes, Instruments, and Systems, 6 (4). Art. No. 045004. ISSN 2329-4124.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Uyama, Taichi0000-0002-6879-3030
Norris, Barnaby0000-0002-8352-7515
Jovanovic, Nemanja0000-0001-5213-6207
Lozi, Julien0000-0002-3047-1845
Tuthill, Peter0000-0001-7026-6291
Guyon, Olivier0000-0002-1097-9908
Kudo, Tomoyuki0000-0002-9294-1793
Hashimoto, Jun0000-0002-3053-3575
Tamura, Motohide0000-0002-6510-0681
Martinache, Frantz0000-0003-1180-4138
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.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)23340051
Japan Society for the Promotion of Science (JSPS)26220704
Japan Society for the Promotion of Science (JSPS)23103002
National Institutes of Natural Sciences (NINS)UNSPECIFIED
Mt. Cuba Astronomical FoundationUNSPECIFIED
Subaru TelescopeUNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20201117-095717050
Persistent URL:
Official Citation:Taichi Uyama, Barnaby Norris, Nemanja Jovanovic, Julien Lozi, Peter G. Tuthill, Olivier Guyon, Tomoyuki Kudo, Jun Hashimoto, Motohide Tamura, and Frantz Martinache "High-contrast Hα imaging with Subaru/SCExAO + VAMPIRES," Journal of Astronomical Telescopes, Instruments, and Systems 6(4), 045004 (9 November 2020).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106696
Deposited By: Tony Diaz
Deposited On:17 Nov 2020 18:06
Last Modified:17 Nov 2020 18:08

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