3 years ago

Investigation of the inner structures around HD169142 with VLT/SPHERE.

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

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 $\sim$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 $\sim$93 mas separation and position angle of 355$^{\circ}$, 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 $\sim$100 mas. Follow-up observations are necessary to confirm the detection and the nature of this source and structure.

Publisher URL: http://arxiv.org/abs/1709.01734

DOI: arXiv:1709.01734v2

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