Investigation of the inner structures around HD169142 with VLT/SPHERE

R. Ligi, A. Vigan, R. Gratton, J. de Boer, M. Benisty, A. Boccaletti, S. P. Quanz, M. Meyer, C. Ginski, E. Sissa, C. Gry, T. Henning, J. -L. Beuzit, B. Biller, M. Bonnefoy, G. Chauvin, A. C. Cheetham, M. Cudel, P. Delorme, S. DesideraM. Feldt, R. Galicher, J. Girard, M. Janson, M. Kasper, T. Kopytova, A. -M. Lagrange, M. Langlois, H. Lecoroller, A. -L. Maire, F. Ménard, D. Mesa, S. Peretti, C. Perrot, P. Pinilla, A. Pohl, D. Rouan, T. Stolker, M. Samland, Z. Wahhaj, F. Wildi, A. Zurlo, T. Buey, D. Fantinel, T. Fusco, M. Jaquet, T. Moulin, J. Ramos, M. Suarez, L. Weber

Research output: Contribution to journalArticlepeer-review

Abstract

We present observations of the Herbig Ae star HD 169142 with the 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 KS 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 YJ 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.
Original languageEnglish
Pages (from-to)1774-1783
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume473
Issue number2
Early online date2 Nov 2017
DOIs
Publication statusPublished - 1 Jan 2018

Keywords

  • astro-ph.EP

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