Magellan AO System z‧, Y S , and L‧ Observations of the Very Wide 650 AU HD 106906 Planetary System
Abstract
We analyze archival data from Bailey and co-workers from the Magellan adaptive optics system and present the first 0.9 μm detection (z‧ = 20.3 ± 0.4 mag; Δz‧ = 13.0 ± 0.4 mag) of the 11 M Jup circumbinary planet HD 106906AB b, as well as 1 and 3.8 μm detections of the debris disk around the binary. The disk has an east-west asymmetry in length and surface brightness, especially at 3.8 μm where the disk appears to be one-sided. The spectral energy distribution of b, when scaled to the K S -band photometry, is consistent with 1800 K atmospheric models without significant dust reddening, unlike some young, very red, low-mass companions such as CT Cha B and 1RXS 1609 B. Therefore, the suggested circumplanetary disk of Kalas and co-workers might not contain much material, or might be closer to face-on. Finally, we suggest that the widest (a ≳ 100 AU) low mass ratio (M p/M ⋆ ≡ q ≲ 0.01) companions may have formed inside protoplanetary disks but were later scattered by binary/planet interactions. Such a scattering event may have occurred for HD 106906AB b with its central binary star, but definitive proof at this time is elusive.
This paper includes data gathered with the 6.5 m Magellan Clay Telescope at Las Campanas Observatory, Chile.- Publication:
-
The Astrophysical Journal
- Pub Date:
- May 2016
- DOI:
- 10.3847/0004-637X/823/1/24
- arXiv:
- arXiv:1604.06847
- Bibcode:
- 2016ApJ...823...24W
- Keywords:
-
- circumstellar matter;
- instrumentation: adaptive optics;
- planets and satellites: individual: HD 106906AB b;
- stars: individual: HD 106906AB;
- techniques: high angular resolution;
- Astrophysics - Earth and Planetary Astrophysics
- E-Print:
- Accepted for publication in ApJ