SCExAO/CHARIS High-contrast Imaging of Spirals and Darkening Features in the HD 34700 A Protoplanetary Disk

Taichi Uyama, Thayne Currie, Valentin Christiaens, Jaehan Bae, Takayuki Muto, Sanemichi Z. Takahashi, Ryo Tazaki, Marie Ygouf, Jeremy N. Kasdin, Tyler Groff, Timothy D. Brandt, Jeffrey Chilcote, Masahiko Hayashi, Michael W. McElwain, Olivier Guyon, Julien Lozi, Nemanja Jovanovic, Frantz Martinache, Tomoyuki Kudo, Motohide TamuraEiji Akiyama, Charles A. Beichman, Carol A. Grady, Gillian R. Knapp, Jungmi Kwon, Michael Sitko, Michihiro Takami, Kevin R. Wagner, John P. Wisniewski, Yi Yang

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


We present Subaru/SCExAO+Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS) broadband (JHK-band) integral field spectroscopy of HD 34700 A. CHARIS data recover HD 34700 A's disk ring and confirm multiple spirals discovered by Monnier et al. We set limits on substellar companions of ∼12 M Jup at 0.″3 (in the ring gap) and ∼5 M Jup at 0.″75 (outside the ring). The data reveal darkening effects on the ring and spiral, although we do not identify the origin of each feature such as shadows or physical features related to the outer spirals. Geometric albedos converted from the surface brightness suggest a greater scale height and/or prominently abundant submicron dust at position angles between ∼45° and 90°. Spiral fitting resulted in very large pitch angles (∼30°-50°); a stellar flyby of HD 34700 B or infall from a possible envelope is perhaps a reasonable scenario to explain the large pitch angles.

Original languageEnglish (US)
Article number135
JournalAstrophysical Journal
Issue number2
StatePublished - Sep 10 2020

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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