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Direct imaging of an asymmetric debris disk in the HD 106906 planetary system

  • Author(s): Kalas, PG
  • Rajan, A
  • Wang, JJ
  • Millar-Blanchaer, MA
  • Duchene, G
  • Chen, C
  • Fitzgerald, MP
  • Dong, R
  • Graham, JR
  • Patience, J
  • Macintosh, B
  • Murray-Clay, R
  • Matthews, B
  • Rameau, J
  • Marois, C
  • Chilcote, J
  • Rosa, RJD
  • Doyon, R
  • Draper, ZH
  • Lawler, S
  • Ammons, SM
  • Arriaga, P
  • Bulger, J
  • Cotten, T
  • Follette, KB
  • Goodsell, S
  • Greenbaum, A
  • Hibon, P
  • Hinkley, S
  • Hung, LW
  • Ingraham, P
  • Konapacky, Q
  • Lafreniere, D
  • Larkin, JE
  • Long, D
  • Maire, J
  • Marchis, F
  • Metchev, S
  • Morzinski, KM
  • Nielsen, EL
  • Oppenheimer, R
  • Perrin, MD
  • Pueyo, L
  • Rantakyrö, FT
  • Ruffio, JB
  • Saddlemyer, L
  • Savransky, D
  • Schneider, AC
  • Sivaramakrishnan, A
  • Soummer, R
  • Song, I
  • Thomas, S
  • Vasisht, G
  • Ward-Duong, K
  • Wiktorowicz, SJ
  • Wolff, SG
  • et al.

We present the first scattered light detections of the HD 106906 debris disk using the Gemini/Gemini Planet Imager in the infrared and Hubble Space Telescope (HST)/Advanced Camera for Surveys in the optical. HD 106906 is a 13 Myr old F5V star in the Sco-Cen association, with a previously detected planet-mass candidate HD 106906b projected 650 AU from the host star. Our observations reveal a near edge-on debris disk that has a central cleared region with radius ∼50 AU, and an outer extent >500 AU. The HST data show that the outer regions are highly asymmetric, resembling the "needle" morphology seen for the HD 15115 debris disk. The planet candidate is oriented ∼21° away from the position angle of the primary's debris disk, strongly suggesting non-coplanarity with the system. We hypothesize that HD 106906b could be dynamically involved in the perturbation of the primary's disk, and investigate whether or not there is evidence for a circumplanetary dust disk or cloud that is either primordial or captured from the primary. We show that both the existing optical properties and near-infrared colors of HD 106906b are weakly consistent with this possibility, motivating future work to test for the observational signatures of dust surrounding the planet.

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