Investigation of the inner structures around HD 169142 with VLT/SPHERE
Rouan, D.; Ménard, F.; Quanz, S. P.; Henning, T.; Fantinel, D.; Ginski, C.; Girard, J.; Pinilla, P.; Wahhaj, Z.; Fusco, T.; Benisty, M.; Pohl, A.; de Boer, J.; Zurlo, A.; Boccaletti, A.; Janson, M.; Langlois, M.; Ligi, R.; Maire, A. -L.; Meyer, M.; Stolker, T.; Ramos, J.; Weber, L.; Lagrange, A. -M.; Desidera, S.; Delorme, P.; Bonnefoy, M.; Mesa, D.; Perrot, C.; Gratton, R.; Vigan, A.; Chauvin, G.; Galicher, R.; Samland, M.; Beuzit, J. -L.; Peretti, S.; Sissa, E.; Feldt, M.; Gry, C.; Biller, B.; Wildi, F.; Buey, T.; Kasper, M.; Kopytova, T.; Jaquet, M.; Moulin, T.; Suarez, M.; Cudel, M.; Cheetham, A. C.; Lecoroller, H.
France, Italy, Netherlands, Switzerland, United States, Germany, United Kingdom, Australia, Chile, Sweden, Russia
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.