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Obliquity Constraints on the Planetary-mass Companion HD 106906 b
- Publication Year :
- 2021
- Publisher :
- arXiv, 2021.
-
Abstract
- We constrain the angular momentum architecture of HD 106906, a 13 $\pm$ 2 Myr old system in the ScoCen complex composed of a compact central binary, a widely separated planetary-mass tertiary HD 106906 b, and a debris disk nested between the binary and tertiary orbital planes. We measure the orientations of three vectors: the companion spin axis, companion orbit normal, and disk normal. Using near-IR high-resolution spectra from Gemini/IGRINS, we obtain a projected rotational velocity of $v\sin{i_p}$ = 9.5 $\pm$ 0.2 km/s for HD 106906 b. This measurement together with a published photometric rotation period implies the companion is viewed nearly pole-on, with a line-of-sight spin axis inclination of $i_p$ = 14 $\pm$ 4 degrees or 166 $\pm$ 4 degrees. By contrast, the debris disk is known to be viewed nearly edge-on. The likely misalignment of all three vectors suggests HD 106906 b formed by gravitational instability in a turbulent environment, either in a disk or cloud setting.<br />Comment: accepted to AJ. 14 pages, 7 figures
- Subjects :
- Rotation period
Physics
Earth and Planetary Astrophysics (astro-ph.EP)
Angular momentum
Debris disk
Binary number
FOS: Physical sciences
Astronomy and Astrophysics
Angular velocity
Astrophysics
Orbit
Space and Planetary Science
Astrophysics::Solar and Stellar Astrophysics
Astrophysics::Earth and Planetary Astrophysics
Planetary mass
HD 106906 b
Astrophysics::Galaxy Astrophysics
Astrophysics - Earth and Planetary Astrophysics
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....f1f9fbdebd8bd717c8a28fc4c3468bcb
- Full Text :
- https://doi.org/10.48550/arxiv.2108.13437