BEAST begins: Sample characteristics and survey performance of the B-star Exoplanet Abundance Study

Abstract

While the occurrence rate of wide giant planets appears to increase with stellar mass at least up through the A-type regime, B-type stars have not been systematically studied in large-scale surveys so far. It therefore remains unclear up to what stellar mass this occurrence trend continues. The B-star Exoplanet Abundance Study (BEAST) is a direct imaging survey with the extreme adaptive optics instrument SPHERE, targeting 85 B-type stars in the young Scorpius-Centaurus (Sco-Cen) region with the aim to detect giant planets at wide separations and constrain their occurrence rate and physical properties. The statistical outcome of the survey will help determine if and where an upper stellar mass limit for planet formation occurs. In this work, we describe the selection and characterization of the BEAST target sample. Particular emphasis is placed on the age of each system, which is a central parameter in interpreting direct imaging observations. We implement a novel scheme for age dating based on kinematic sub-structures within Sco-Cen, which complements and expands upon previous age determinations in the literature. We also present initial results from the first epoch observations, including the detections of ten stellar companions, of which six were previously unknown. All planetary candidates in the survey will need follow up in second epoch observations, which are part of the allocated observational programme and will be executed in the near future.

22 pages, 15 figures, accepted for publication in A&A

References in corpus (29)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Planet formation around stars of various masses: The snow line and the frequency of giant planets
• The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics From 10-100 AU
• Two accreting protoplanets around the young star PDS 70
• The Optical to Mid-Infrared Extinction Law Based on the APOGEE, Gaia DR2, Pan-STARRS1, SDSS, APASS, 2MASS and WISE Surveys
• The Gemini Deep Planet Survey -- GDPS
• Three-dimensional mapping of the local interstellar medium with composite data
• Direct Imaging of Fine Structures in Giant Planet Forming Regions of the Protoplanetary Disk around AB Aurigae
• Precise Radial Velocities of Giant Stars VII. Occurrence Rate of Giant Extrasolar Planets as a Function of Mass and Metallicity
• Planets Around Low-Mass Stars (PALMS). IV. The Outer Architecture of M Dwarf Planetary Systems
• Discovery of a warm, dusty giant planet around HIP65426
• A Statistical Analysis of SEEDS and Other High-Contrast Exoplanet Surveys: Massive Planets or Low-Mass Brown Dwarfs?
• Near-infrared scattered light properties of the HR4796A dust ring: a measured scattering phase function from 13.6deg to 166.6deg
• Older and Colder: The impact of starspots on pre-main sequence stellar evolution
• The VLT/NaCo large program to probe the occurrence of exoplanets and brown dwarfs at wide orbits: II- Survey description, results and performances
• Refining the Census of the Upper Scorpius Association with Gaia
• Age Determination in Upper Scorpius with Eclipsing Binaries
• Extended stellar systems in the solar neighborhood - II. Discovery of a nearby 120° stellar stream in Gaia DR2
• A Survey for Massive Giant Planets in Debris Disks with Evacuated Inner Cavities
• A Direct Imaging Survey of Spitzer detected debris disks: Occurrence of giant planets in dusty systems
• The AstraLux Multiplicity Survey: Extension to Late M-dwarfs
• MASSIVE: A Bayesian analysis of giant planet populations around low-mass stars
• Strong H$\alpha$ emission and signs of accretion in a circumbinary planetary mass companion from MUSE
• TRAP: A temporal systematics model for improved direct detection of exoplanets at small angular separations
• The B-Star Exoplanet Abundance Study: a co-moving 16-25 Mjup companion to the young binary system HIP 79098
• Isochronal age-mass discrepancy of young stars: SCExAO/CHARIS integral field spectroscopy of the HIP 79124 triple system
• Planet Migration in Self-Gravitating Discs: Survival of Planets
• Absolute Parameters of YOung Stars: GG Lup and mu^1 Sco
• VLT/SPHERE survey for exoplanets around young, early-type stars including systems with multi-belt architectures

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• Increasing the raw contrast of VLT/SPHERE with the dark-hole technique. II. On-sky wavefront correction and coherent differential imaging
• Efficient Dust Radial Drift Around Young Intermediate-mass Stars
• Multiples among B stars in the Scorpius-Centaurus association
• The COBREX archival survey: improved constraints on the occurrence rate of wide-orbit substellar companions. I. A uniform re-analysis of 400 stars from the GPIES survey
• The Scorpion Planet Survey: Wide-Orbit Giant Planets Around Young A-type Stars
• The link between infall location, early disc size, and the fraction of self-gravitationally fragmenting discs
• Use the 4S (Signal-Safe Speckle Subtraction): Explainable Machine Learning reveals the Giant Exoplanet AF Lep b in High-Contrast Imaging Data from 2011
• An imaged 15Mjup companion within a hierarchical quadruple system
• DIPSY: A new Disc Instability Population SYnthesis, II. The Populations of Companions Formed Through Disc Instability
• Giant planets population around B stars from the first part of the BEAST survey
• Making BEASTies: dynamical formation of planetary systems around massive stars
• SPHERE adaptive optics performance for faint targets
• The SPHERE infrared survey for exoplanets (SHINE). V. Complete observations, data reduction and analysis, detection performances, and final results
• BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208
• An optimised survey strategy for the ERIS/NIX imager: searching for young giant exoplanets and very low mass brown dwarfs using the K-peak custom photometric filter
• Spectral cube extraction for the VLT/SPHERE IFS: Open-source pipeline with full forward modeling and improved sensitivity
• A candidate giant planet companion to the massive, young white dwarf GALEX J071816.4+373139 informs the occurrence of giant planets orbiting B stars
• Low-mass stellar and substellar candidate companions around massive stars in Sco OB1 and M17
• Evolution of the Accretion Rate of Young Intermediate Mass Stars: Implications for Disk Evolution and Planet Formation