Resolving the MYSO binaries PDS 27 and PDS 37 with VLTI/PIONIER

Abstract

Binarity and multiplicity appear to be a common outcome in star formation. In particular, the binary fraction of massive (OB-type) stars can be very high. In many cases, the further stellar evolution of these stars is affected by binary interactions at some stage during their lifetime. The origin of this high binarity and the binary parameters are poorly understood because observational constraints are scarce, which is predominantly due to a dearth of known young massive binary systems. We aim to identify and describe massive young binary systems in order to fill in the gaps of our knowledge of primordial binarity of massive stars, which is crucial for our understanding of massive star formation. We observed the two massive young stellar objects (MYSOs) PDS 27 and PDS 37 at the highest spatial resolution provided by VLTI/PIONIER in the H-band (1.3 mas). We applied geometrical models to fit the observed squared visibilities and closure phases. In addition, we performed a radial velocity analysis using published VLT/FORS2 spectropolarimetric and VLT/X-shooter spectroscopic observations. Our findings suggest binary companions for both objects at 12 mas (30 au) for PDS 27 and at 22-28 mas (42-54 au) for PDS 37. This means that they are among the closest MYSO binaries resolved to date. Our data spatially resolve PDS 27 and PDS 37 for the first time, revealing two of the closest and most massive ($>$8 M${}_{\odot }$) YSO binary candidates to date. PDS 27 and PDS 37 are rare but great laboratories to quantitatively inform and test the theories on formation of such systems.

10 pages, 5 figures, 3 tables, accepted for publication in A&A

References in corpus (15)

• Binary interaction dominates the evolution of massive stars
• Southern Massive Stars at High Angular Resolution: Observational Campaign and Companion Detection
• Circumventing the radiation pressure barrier in the formation of massive stars via disk accretion
• The Fragmentation of Magnetized, Massive Star-Forming Cores with Radiative Feedback
• Structure of Herbig AeBe disks at the milliarcsecond scale A statistical survey in the H band using PIONIER-VLTI
• A hot compact dust disk around a massive young stellar object
• An Unstable Truth: How Massive Stars get their Mass
• An evolutionary catalogue of Galactic post-AGB and related objects
• G11.92-0.61 MM1: A Keplerian disc around a massive young proto-O star
• Forming spectroscopic massive proto-binaries by disk fragmentation
• Outflows from the high-mass protostars NGC 7538 IRS1/2 observed with bispectrum speckle interferometry -- Signatures of flow precession
• A high-mass protobinary system with spatially resolved circumstellar accretion disks and circumbinary disk
• A pilot survey of the binarity of Massive Young Stellar Objects with $K$ band adaptive optics
• Multiplicity and disks within the high-mass core NGC7538IRS1: Resolving cm line and continuum emission at ~0.06"x0.05" resolution
• Herbig AeBe stars: Multiplicity and consequences

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