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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2018

Investigation of the inner structures around HD169142 with VLT/SPHERE

R. Ligi
Arthur Vigan
R. Gratton
C. Gry
S. Desidera
M. Janson
D. Mesa
P. Pinilla
  • Fonction : Auteur
T. Stolker
M. Samland
D. Fantinel

Résumé

We present observations of the Herbig Ae star HD169142 with VLT/SPHERE instruments InfraRed Dual-band Imager and Spectrograph (IRDIS) (K1K2 and H2H3 bands) and the Integral Field Spectrograph (IFS) (Y , J and H bands). We detect several bright blobs at ∼180 mas separation from the star, and a faint arc-like structure in the IFS data. Our reference differential imaging (RDI) data analysis also finds a bright ring at the same separation. We show, using a simulation based on polarized light data, that these blobs are actually part of the ring at 180 mas. These results demonstrate that the earlier detections of blobs in the H and K S bands at these separations in Biller et al. as potential planet/substellar companions are actually tracing a bright ring with a Keplerian motion. Moreover, we detect in the images an additional bright structure at ∼93 mas separation and position angle of 355 • , at a location very close to previous detections. It appears point-like in the Y J and K bands but is more extended in the H band. We also marginally detect an inner ring in the RDI data at ∼100 mas. Follow-up observations are necessary to confirm the detection and the nature of this source and structure.
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Dates et versions

hal-01707082 , version 1 (12-02-2018)

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R. Ligi, Arthur Vigan, R. Gratton, J. de Boer, M. Benisty, et al.. Investigation of the inner structures around HD169142 with VLT/SPHERE. Monthly Notices of the Royal Astronomical Society, 2018, 473 (2), pp.1774-1783. ⟨10.1093/mnras/stx2318⟩. ⟨hal-01707082⟩
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