Ae stars; Star formation; Binary stars; 20; 1569; 154
Abstract :
[en] We report the discovery of a low-mass stellar companion around the young Herbig Be star MWC 297. We performed multi-epoch high-contrast imaging in the near-infrared with the Very Large Telescope (VLT)/Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) instrument. The companion is found at a projected separation of 244.7 ± 13.2 au and a position angle of 176.4 ± 0.1 deg. The large separation supports formation via gravitational instability. From the spectrum, we estimate a mass of 0.1-0.5 M<SUB>⊙</SUB>, the range conveying uncertainties in the extinction of the companion and in evolutionary models at young ages. The orbit coincides with a gap in the dust disk inferred from the spectral energy distribution. The young age (≲1 Myr) and mass ratio with the central star (∼0.01) makes the companion comparable to PDS 70 b, suggesting a relation between formation scenarios and disk dynamics.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Ubeira-Gabellini, M. Giulia; University of Milan, Department of Physics, European Southern Observatory, Germany
Christiaens, Valentin ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR) ; Monash University, School of Astrophysics
Lodato, Giuseppe; University of Milan, Department of Physics
Ancker, Mario van den; European Southern Observatory, Germany
Fedele, Davide; Astronomical Observatory of Arcetri
Manara, Carlo F.; European Southern Observatory, Germany
Price, Daniel J.; Monash University, School of Astrophysics
Language :
English
Title :
Discovery of a Low-mass Companion Embedded in the Disk of the Young Massive Star MWC 297 with VLT/SPHERE
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