2017/11/24 by G. H. -M. Bertrang, Gesa H.-M. Bertrang, H. Avenhaus +11 · 1 citation
Chemistry · Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Brightness #Exoplanet #Galaxy #Molecular Spectroscopy and Structure #Optics #Physics #Planet #Polarimeter #Polarimetry #RADIUS #Scattering #Stars #Stellar, planetary, and galactic studies #Surface brightness #Telescope #Very Large Telescope #astro-ph.EP
paper · pdf · doi:10.1093/mnras/stx3052
Accepted for publication in MNRAS
arxiv created 2017/11/24 · openalex publication_date 2017/11/24 · arxiv updated 2018/01/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present new data of the protoplanetary disc surrounding the Herbig Ae/Be star HD 169142 obtained in the very broad-band (VBB) with the Zurich imaging polarimeter (ZIMPOL), a subsystem of the Spectro-Polarimetric High-contrast Exoplanet REsearch instrument (SPHERE) at the Very Large Telescope (VLT). Our Polarimetric Differential Imaging (PDI) observations probe the disc as close as 0.03 arcsec (3.5 au) to the star and are able to trace the disc out to ∼1.08 arcsec (∼126 au). We find an inner hole, a bright ring bearing substructures around 0.18 arcsec (21 au), and an elliptically shaped gap stretching from 0.25 to 0.47 arcsec (29–55 au). Outside of 0.47 arcsec, the surface brightness drops off, discontinued only by a narrow annular brightness minimum at ∼0.63 to 0.74 arcsec (74–87 au). These observations confirm features found in less-well-resolved data as well as reveal yet undetected indications for planet-disc interactions, such as small-scale structures, star–disc offsets, and potentially moving shadows.