Observational constraints for the circumstellar disk of the B[e] star CPD-52 9243.

CIDALE, L.S; BORGES FERNANDES, M.; ANDRUCHOW, I.; ARIAS, M.L.; KRAUS, M.; CHESNEAU, O.; KANAAN, S.; CURÉ,M; DE WIT, W.-J.; MURATORE, M.F.

ASTRONOMY AND ASTROPHYSICS

EDP SCIENCES S A

Lugar: Paris; Año: 2012 vol. 548 p. 1 - 9

0004-6361

Context. The formation and evolution of gas and dust environments around B[e] supergiants are still open issues. Aims. We intend to study the geometry, kinematic and physical structure of the circumstellar environment (CE) of the B[e] supergiant CPD−52 9243 to provide further insights into the underlying mechanism originating the B[e] phenomenon. Methods. The influence of the different physical mechanisms acting on the CE (radiation pressure, rotation, bi?stability or tidal forces) is somehow reflected in the shape and kinematic properties of the gas and dust regions (flaring, Keplerian, accretion or outflowing disks). To investigate these processes we mainly used quasi?simultaneous observations taken with high spatial resolution optical long?baseline interferometry (VLTI/MIDI), near?IR spectroscopy of CO bandhead features (Gemini/Phoenix and VLT/CRIRES) and optical spectra. Results. High angular resolution interferometry measurements obtained with VLTI/MIDI provides strong support for the presence of a dusty disk(ring)?like structure around CPD−52 9243, with an upper limit for its inner edge of ∼ 8 mas (∼ 27.5 AU). The disk has an inclination angle respect to the line of sight of ∼ 46◦. The study of CO first?overtone bandhead evidences a disk structure in Keplerian rotation, while the optical spectrum indicates a rapid outflow in the polar direction. Conclusions. The IR and optical observations support evidences in favor of a Keplerian rotating disk and a polar outflow.