Subaru/SCExAO First-light Direct Imaging of a Young Debris Disk around HD 36546

Thayne Currie, Olivier Guyon, Motohide Tamura, Tomoyuki Kudo, Nemanja Jovanovic, Julien Lozi, Joshua E. Schlieder, Timothy D. Brandt, Jonas Kuhn, Eugene Serabyn, Markus Janson, Joseph Carson, Tyler Groff, N. Jeremy Kasdin, Michael W. McElwain, Garima Singh, Taichi Uyama, Masayuki Kuzuhara, Eiji Akiyama, Carol GradySaeko Hayashi, Gillian Knapp, Jung Mi Kwon, Daehyeon Oh, John Wisniewski, Michael Sitko, Yi Yang

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

We present H-band scattered light imaging of a bright debris disk around the A0 star HD 36546 obtained from the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system with data recorded by the HiCIAO camera using the vector vortex coronagraph. SCExAO traces the disk from r ∼ 0.″3 to r ∼ 1″ (34-114 au). The disk is oriented in a near east-west direction (PA ∼ 75°), is inclined by i ∼ 70°-75°, and is strongly forward-scattering (g > 0.5). It is an extended disk rather than a sharp ring; a second, diffuse dust population extends from the disk's eastern side. While HD 36546 intrinsic properties are consistent with a wide age range (t ∼ 1-250 Myr), its kinematics and analysis of coeval stars suggest a young age (3-10 Myr) and a possible connection to Taurus-Auriga's star formation history. SCExAO's planet-to-star contrast ratios are comparable to the first-light Gemini Planet Imager contrasts; for an age of 10 Myr, we rule out planets with masses comparable to HR 8799 b beyond a projected separation of 23 au. A massive icy planetesimal disk or an unseen super-Jovian planet at r > 20 au may explain the disk's visibility. The HD 36546 debris disk may be the youngest debris disk yet imaged, is the first newly identified object from the now-operational SCExAO extreme AO system, is ideally suited for spectroscopic follow-up with SCExAO/CHARIS in 2017, and may be a key probe of icy planet formation and planet-disk interactions.

Original languageEnglish (US)
Article numberL15
JournalAstrophysical Journal Letters
Volume836
Issue number1
DOIs
StatePublished - Feb 10 2017

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • planetary systems
  • stars: individual (HD 36546)
  • stars: solar-type

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