Article (Scientific journals)
Characterization of HD 206893 B from Near- to Thermal-infrared
Meshkat, Tiffany; Gao, Peter; Lee, Eve J. et al.
2021In Astrophysical Journal, 917, p. 62
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Keywords :
Brown dwarfs; Debris disks; Direct imaging; Coronagraphic imaging; Astrometry; Exoplanet atmospheres
Abstract :
[en] HD 206893 B is a brown-dwarf companion orbiting inside the debris disk of its host star. We detect the brown dwarf in the Ms band using the Keck/NIRC2 instrument and vortex coronagraph. We measure its magnitude to be ${Ms}={12.97}_{-0.11}^{0.10}$ . It is at an angular separation of 0"22 ± 0"03, and a position angle of 39.6° ± 5.4° east of north. Using this Ms-band measurement and the system age, we use three evolutionary models to estimate the mass to be 12-78 M[SUB]Jup[/SUB]. We analyze the atmospheric properties from 1-5 μm using a grid of simulated atmospheric models. We find that a sedimentation flux f[SUB]sed[/SUB] value ~0.2 provides the best fit to the data, suggesting high vertically extended clouds. This may be indicative of high-altitude grains or a circumplanetary disk. Our model radii and luminosities for the companion find the best fits are ages of <100 Myr and masses <20 M[SUB]Jup[/SUB], consistent with our mass estimate from the evolutionary models using the Ms-band data alone. We detect orbital motion of the brown dwarf around the host star in comparison to the discovery image and derive orbital parameters. Finally we analyze how the companion brown dwarf interacts with the debris disk by estimating the location of the chaotic zone around the brown dwarf using values derived from this study's estimated mass and orbital constraints. We find that the collisions within the debris belt are likely driven by secular perturbations from the brown dwarf, rather than self-stirring.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Meshkat, Tiffany;  IPAC, California Institute of Technology, M/C 100-22, 1200 East California Boulevard, Pasadena, CA 91125, USA
Gao, Peter;  Department of Astronomy and Astrophysics, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
Lee, Eve J.;  Department of Physics and McGill Space Institute, McGill University, 3550 rue University, Montreal, QC H3A 2T8, Canada
Mawet, Dimitri;  Department of Astronomy, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA ; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
Choquet, Elodie;  Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France
Ygouf, Marie;  Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
Patel, Rahul;  IPAC, California Institute of Technology, M/C 100-22, 1200 East California Boulevard, Pasadena, CA 91125, USA
Ruane, Garreth;  Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
Wang, Jason;  Department of Astronomy, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA
Wallack, Nicole;  Division of Geological & Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA
Absil, Olivier  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > PSILab
Beichman, Charles;  IPAC, California Institute of Technology, M/C 100-22, 1200 East California Boulevard, Pasadena, CA 91125, USA ; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA)
Language :
English
Title :
Characterization of HD 206893 B from Near- to Thermal-infrared
Publication date :
17 August 2021
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
University of Chicago Press, United States - Illinois
Volume :
917
Pages :
62
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
H2020 - 819155 - EPIC - Earth-like Planet Imaging with Cognitive computing
Name of the research project :
EPIC
Funders :
CER - Conseil Européen de la Recherche [BE]
CE - Commission Européenne [BE]
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