BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208

• DOI: 10.48550/arxiv.2305.19122
• Publication Date: 2023-01-01
• Authors: Gayathri Viswanath; M. Janson; R. Gratton; V. Squicciarini; L. Rodet; Simon C. Ringqvist; Eric E. Mamajek; S. Reffert; G. Chauvin; P. Delorme; A. Vigan; M. Bonnefoy; N. Engler; S. Desidera; Thomas Henning; J. Hagelberg; M. Langlois; Markus R. Meyer
• Keywords: Star (game theory); Low Mass; Stellar mass

Recent observations from B-star Exoplanet Abundance Study (BEAST) have illustrated the existence of sub-stellar companions around very massive stars. In this paper, we present detection two lower mass to a relatively nearby ($148.7^{+1.5}_{-1.3}$ pc), young ($17^{+3}_{-4}$ Myr), bright (V=$6.632\pm0.006$ mag), $2.58\pm0.06~ M_{\odot}$ B9V star HIP 81208 residing in Sco-Cen association, using Spectro-Polarimetric High-contrast REsearch (SPHERE) instrument at Very Large Telescope (VLT) Chile. Analysis photometry obtained gives estimates $67^{+6}_{-7}~M_J$ for inner companion and $0.135^{+0.010}_{-0.013}~M_{\odot}$ outer companion, indicating former be most likely brown dwarf latter low-mass star. The system is compact but unusual, as orbital planes are close orthogonal. preliminary solutions derived indicate that Kozai resonance, rendering dynamically interesting future studies.