Journal
ASTRONOMY & ASTROPHYSICS
Volume 578, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201526134
Keywords
stars: variables: T Tauri, Herbig Ae/Be; binaries: general; stars: pre-main sequence; accretion, accretion disks; instrumentation: high angular resolution; techniques: polarimetric
Categories
Funding
- Millennium Science Initiative
- Chilean Ministry of Economy [RC130007]
- ALMA/CONICYT [31100025, 31130027]
- FONDECYT [3140601, 1130949, 1141269]
- CONICYT-FONDECYT [3140592, 31120009, 1140109]
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Context. Z CMa is a binary composed of an embedded Herbig Be and an FU Ori class star separated by similar to 100 au. Observational evidence indicates a complex environment in which each star has a circumstellar disk and drives a jet, and the whole system is embedded in a large dusty envelope. Aims. We aim to probe the circumbinary environment of Z CMa in the inner 400 au in scattered light. Methods. We use high-contrast imaging polarimetry with VLT/NaCo at the H and K-s bands. Results. The central binary is resolved in both bands. The polarized images show three bright and complex structures: a common dust envelope, a sharp extended feature previously reported in direct light, and an intriguing bright clump located 0 ''.3 south of the binary, which appears spatially connected to the sharp extended feature. Conclusions. We detect orbital motion when compared to previous observations, and report a new outburst driven by the Herbig star. Our observations reveal the complex inner environment of Z CMa in unprecedented detail and contrast.
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