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

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

Creators

  • 1. ROR icon Infrared Processing and Analysis Center
  • 2. ROR icon NASA Exoplanet Science Institute
  • 3. ROR icon National Astronomical Observatory of Japan
  • 4. ROR icon Ames Research Center
  • 5. ROR icon University of Hawaii at Hilo
  • 6. ROR icon Eureka Scientific
  • 7. ROR icon Monash University
  • 8. ROR icon Carnegie Institution for Science
  • 9. ROR icon Kogakuin University
  • 10. ROR icon Princeton University
  • 11. ROR icon Goddard Space Flight Center
  • 12. ROR icon University of California, Santa Barbara
  • 13. ROR icon University of Notre Dame
  • 14. ROR icon University of Arizona
  • 15. ROR icon Astrobiology Center
  • 16. ROR icon California Institute of Technology
  • 17. ROR icon Observatoire de la Côte d'Azur
  • 18. ROR icon University of Tokyo
  • 19. ROR icon Niigata Institute of Technology
  • 20. ROR icon Space Science Institute
  • 21. ROR icon National Taiwan University
  • 22. ROR icon University of Oklahoma

Abstract

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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2007.11655.pdf

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Additional details

Identifiers

Eprint ID
104981
Resolver ID
CaltechAUTHORS:20200817-123125126

Related works

Describes
https://arxiv.org/abs/2007.11655 (URL)

Funding

NASA Senior Postdoctoral Fellowship
NASA
80NSSC20K0252
NASA
NNX17AF88G
Japan Society for the Promotion of Science (JSPS)
19K14764
Japan Society for the Promotion of Science (JSPS)
18H05442
Japan Society for the Promotion of Science (JSPS)
15H02063
Japan Society for the Promotion of Science (JSPS)
22000005
Japan Society for the Promotion of Science (JSPS)
17K05399
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)
Mt. Cuba Astronomical Foundation
Subaru Telescope
Japan Society for the Promotion of Science (JSPS)
2302

Dates

Created
2020-08-17
Created from EPrint's datestamp field
Updated
2021-11-16
Created from EPrint's last_modified field

Caltech Custom Metadata

Caltech groups
Infrared Processing and Analysis Center (IPAC)