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Published September 10, 2020 | Published + Submitted
Journal Article Open

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


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.

Additional Information

© 2020 The American Astronomical Society. Received 2020 June 1; revised 2020 July 22; accepted 2020 July 22; published 2020 September 9. The authors would like to thank the anonymous referees for their constructive comments and suggestions to improve the quality of the paper. We thank John Monnier for authorization to use GPI-PDI images originally presented in Monnier et al. (2019). The authors are grateful to Gijs Mulders for helpful comments. This research is based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatories of Japan. 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. This research made use of Astropy, a community-developed core Python package for Astronomy (Astropy Collaboration et al. 2013, 2018). T.U. acknowledges JSPS overseas research fellowship. T.C. is funded by a NASA Senior Postdoctoral Fellowship. J.W. acknowledges funding support from the NASA XRP program via grants 80NSSC20K0252 and NNX17AF88G. S.T. is supported by JSPS KAKENHI Grant-in-Aid for Early-Career Scientists No. 19K14764. M.T. is supported by MEXT/JSPS KAKENHI grant Nos. 18H05442, 15H02063, and 22000005. E.A. is supported by MEXT/JSPS KAKENHI grant No. 17K05399. The development of SCExAO was supported by JSPS (Grant-in-Aid for Research #23340051, #26220704 & #23103002), Astrobiology Center of NINS, Japan, the Mt Cuba Foundation, and the director's contingency fund at Subaru Telescope. CHARIS was developed under the support by the Grant-in-Aid for Scientific Research on Innovative Areas #2302. The authors wish to acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.

Attached Files

Published - Uyama_2020_ApJ_900_135.pdf

Submitted - 2007.11655.pdf


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August 19, 2023
October 20, 2023