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

Abstract

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 the detection of two lower mass companions to a relatively nearby ($148.7_{-1.3}^{+1.5}$ pc), young ($17_{-4}^{+3}$ Myr), bright (V=$6.632\pm 0.006$ mag), $2.58\pm 0.06M_{\odot }$ B9V star HIP 81208 residing in the Sco-Cen association, using the Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) instrument at the Very Large Telescope (VLT) in Chile. Analysis of the photometry obtained gives mass estimates of $67_{-7}^{+6}{M}_J$ for the inner companion and $0.135_{-0.013}^{+0.010}{M}_{\odot }$ for the outer companion, indicating the former to be most likely a brown dwarf and the latter to be a low-mass star. The system is compact but unusual, as the orbital planes of the two companions are likely close to orthogonal. The preliminary orbital solutions we derived for the system indicate that the star and the two companions are likely in a Kozai resonance, rendering the system dynamically very interesting for future studies.

arXiv comment18 pages, 14 figures, 5 tables Accepted for publication in the 10. Planets and planetary systems section of A&A

References in corpus (76)

• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• Gaia Data Release 3: Summary of the content and survey properties
• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• A Hipparcos census of the nearby OB associations
• X-shooter, the new wide band intermediate resolution spectrograph at the ESO Very Large Telescope
• The Limiting Effects of Dust in Brown Dwarf Model Atmospheres
• A new generation of PARSEC-COLIBRI stellar isochrones including the TP-AGB phase
• Angular Differential Imaging: a Powerful High-Contrast Imaging Technique
• Detection and Characterization of Exoplanets and Disks using Projections on Karhunen-Loeve Eigenimages
• IAS15: A fast, adaptive, high-order integrator for gravitational dynamics, accurate to machine precision over a billion orbits
• Discovery of a planetary-mass companion within the gap of the transition disk around PDS 70
• Planet Migration and Binary Companions: the case of HD 80606b
• PARSEC evolutionary tracks of massive stars up to $350M_{\odot }$ at metallicities 0.0001$\le Z\le$0.04
• First Light for GRAVITY: Phase Referencing Optical Interferometry for the Very Large Telescope Interferometer
• SPHERE: the exoplanet imager for the Very Large Telescope
• A Revised Age for Upper Scorpius and The Star-Formation History Among the F-Type Members of the Scorpius-Centaurus OB Association
• Discovery and spectroscopy of the young Jovian planet 51 Eri b with the Gemini Planet Imager
• Second ROSAT all-sky survey (2RXS) source catalogue
• The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics From 10-100 AU
• Quantifying the Uncertainty in the Orbits of Extrasolar Planets
• Stellar and substellar companions of nearby stars from Gaia DR2 - Binarity from proper motion anomaly
• Unresolved stellar companions with Gaia DR2 astrometry
• Dynamic temperature selection for parallel-tempering in Markov chain Monte Carlo simulations
• Post-T Tauri Stars in the Nearest OB Association
• Photometric characterization of exoplanets using angular and spectral differential imaging
• The Hipparcos-Gaia Catalog of Accelerations: Gaia EDR3 Edition
• A Super-Earth Transiting a Naked-Eye Star
• Stellar and substellar companions from Gaia EDR3 -- Proper motion anomaly and resolved common proper motion pairs
• Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G=18.5
• The SPHERE infrared survey for exoplanets (SHINE). III. The demographics of young giant exoplanets below 300 au with SPHERE
• Gaia Data Release 3: Astrophysical parameters inference system (Apsis) I -- methods and content overview
• 3D maps of interstellar dust in the Local Arm: using $Gaia$, 2MASS and APOGEE-DR14
• Discovery of a warm, dusty giant planet around HIP65426
• XHIP: An Extended Hipparcos Compilation
• Individual Dynamical Masses of Ultracool Dwarfs
• The Evolution of Wide Binary Stars
• Resolving nearby dust clouds
• orbitize!: A Comprehensive Orbit-fitting Software Package for the High-contrast Imaging Community
• High Orbital Eccentricities of Extrasolar Planets Induced by the Kozai Mechanism
• 3D mapping of young stars in the solar neighbourhood with Gaia DR2
• Astrometric and photometric accuracies in high contrast imaging: The SPHERE speckle calibration tool (SpeCal)
• Orbits for the Impatient: A Bayesian Rejection Sampling Method for Quickly Fitting the Orbits of Long-Period Exoplanets
• The Solar Neighborhood XXX: Fomalhaut C
• Enhanced Black-Hole Mergers in Binary-Binary Interactions
• High resolution imaging of young M-type stars of the solar neighborhood: Probing the existence of companions down to the mass of Jupiter
• The stellar population of Sco OB2 revealed by Gaia DR2 data
• Planets Around Low-Mass Stars (PALMS). I. A Substellar Companion to the Young M Dwarf 1RXS J235133.3+312720
• Performance of the VLT Planet Finder SPHERE I. Photometry and astrometry precision with IRDIS and IFS in laboratory
• The SEEDS Direct Imaging Survey for Planets and Scattered Dust Emission in Debris Disk Systems
• The mass of Beta Pictoris c from Beta Pictoris b orbital motion
• Orbit alignment in triple stars
• Direct discovery of the inner exoplanet in the HD206893 system. Evidence for deuterium burning in a planetary-mass companion
• Two Directly Imaged, Wide-orbit Giant Planets around the Young, Solar Analog TYC 8998-760-1
• Direct Imaging and Astrometric Detection of a Gas Giant Planet Orbiting an Accelerating Star
• A Direct Imaging Survey of Spitzer detected debris disks: Occurrence of giant planets in dusty systems
• The SEEDS High Contrast Imaging Survey of Exoplanets around Young Stellar Objects
• SPOTS: The Search for Planets Orbiting Two Stars: II. First constraints on the frequency of sub-stellar companions on wide circumbinary orbits
• SCExAO/CHARIS Direct Imaging Discovery of a 20 au Separation, Low-Mass Ratio Brown Dwarf Companion to an Accelerating Sun-like Star
• A wide-orbit giant planet in the high-mass b Centauri binary system
• The TRENDS High-Contrast Imaging Survey. VI. Discovery of a Mass, Age, and Metallicity Benchmark Brown Dwarf
• Dynamical Masses of Eps Ind B and C: Two Massive Brown Dwarfs at the Edge of the Stellar-Substellar Boundary
• The First Dynamical Mass Measurement in the HR 8799 System
• Populating the brown dwarf and stellar boundary: Five stars with transiting companions near the hydrogen-burning mass limit
• Orbital Architectures of Planet-Hosting Binaries II. Low Mutual Inclinations Between Planetary and Stellar Orbits
• New Brown Dwarf Companions to Young Stars in Scorpius-Centaurus
• Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-Dwarf Companion in the Hyades
• ISPY -- NACO Imaging Survey for Planets around Young stars: Survey description and results from the first 2.5 years of observations
• Fundamental Properties of Co-Moving Stars observed by $Gaia$
• The B-Star Exoplanet Abundance Study: a co-moving 16-25 Mjup companion to the young binary system HIP 79098
• SPOTS: The Search for Planets Orbiting Two Stars. III. Complete Sample and Statistical Analysis
• BEAST begins: Sample characteristics and survey performance of the B-star Exoplanet Abundance Study
• A scaled-up planetary system around a supernova progenitor
• MADYS: the Manifold Age Determination for Young Stars
• The Scorpion Planet Survey: Wide-Orbit Giant Planets Around Young A-type Stars

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• Multiples among B stars in the Scorpius-Centaurus association
• An imaged 15Mjup companion within a hierarchical quadruple system
• Giant planets population around B stars from the first part of the BEAST survey
• The SPHERE infrared survey for exoplanets (SHINE). V. Complete observations, data reduction and analysis, detection performances, and final results