![]() By comparison with AMES-Cond evolutionary tracks, we find that only some atmosphericmodels predict physically plausible objects. The extremely red color and the very shallow 1.4 μm water absorption feature of HD 206893 B can be fit well with the adapted atmospheric models and spectral retrievals. We also infer the orbital parameters of HD 206893 B by combining the ~100 μas precision astrometry from GRAVITY with data from the literature and constrain the mass and position of HD 206893 C based on the Gaia proper motion anomaly of the system. However, forsterite, corundum, and iron grains predict similar extinction curves for the grain sizes considered here. To recover its unusual spectral features, first and foremost its extremely red near-infrared color, we include additional extinction by high-altitude dust clouds made of enstatite grains in the atmospheric model fits. We fit atmospheric models for giant planets and brown dwarfs and perform spectral retrievals with petitRADTRANS and ATMO on the observed GRAVITY, SPHERE, and GPI spectra of HD 206893 B. ![]() We aim to reveal the nature of the reddest known substellar companion HD 206893 B by studying its near-infrared colors and spectral morphology and by investigating its orbital motion. Near-infrared interferometry has become a powerful tool for studying the orbital and atmospheric parameters of substellar companions.Īims. STAR Institute/Université de Liège, BelgiumĬenter for Astrophysics and Planetary Science, Department of Astronomy, Cornell University,ĭepartment of Physics and Astronomy, Johns Hopkins University,ĭepartment of Earth & Planetary Sciences, Johns Hopkins University,Īcademia Sinica, Institute of Astronomy and Astrophysics,ġ1F Astronomy-Mathematics Building, NTU/AS campus, No. School of Physics, University College Dublin,Īstronomy Department, University of Michigan, Universidade do Porto, Faculdade de Engenharia, Rua Dr. Hamburger Sternwarte, Universität Hamburg, Max Planck Institute for Radio Astronomy, Institute of Physics, University of Cologne, ![]() JILA and Department of Astrophysical and Planetary Sciences, University of Colorado, School of Physics and Astronomy, Monash University, Max Planck Institute for extraterrestrial Physics, Universidade de Lisboa - Faculdade de Ciências,ĬENTRA - Centro de Astrofísica e Gravitação, IST, Universidade de Lisboa, Institute of Astronomy, University of Cambridge, LESIA, Observatoire de Paris, PSL, CNRS, Sorbonne Université, Université de Paris,ĭepartment of Astronomy, California Institute of Technology, Yazici 10 the GRAVITY CollaborationĮ-mail: School of Astronomy & Astrophysics, Australian National University, Astronomical objects: linking to databases.Including author names using non-Roman alphabets.Suggested resources for more tips on language editing in the sciences Punctuation and style concerns regarding equations, figures, tables, and footnotes
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