High-resolution images of the stellar jets MHO 1502 and MHO 2147 obtained with GSAOI+GeMS

FERRERO, L. V.; GUNTHARDT, G.; GARCÍA, L.; M. GÓMEZ; V.M. KALARI; H.P. SALDAÑO

ASTRONOMY AND ASTROPHYSICS

EDP SCIENCES S A

Lugar: Paris; Año: 2022 vol. 657 p. 110 - 131

0004-6361

Aims. We investigated the possible cause-effect relation between the wiggling shape of two stellar jets, MHO 1502 and MHO 2147, and the potential binarity of the respective driving stars.Methods. We present high-angular resolution H_2 2.122 micron and K-band images obtained with GSAOI+GeMS. The profiles of the jets are depicted in detail by the H_2 images. K-band data allowed us to search for potential close companions to the previously suggested exciting sources. We used archive data to investigate these sources as well as the environments in which the jets are located. We also applied a model to reproduce the wiggling profiles of the jets.Results. MHO1 502 is composed by a chain of knots delineating the wiggling jet, suggesting that the driving source has emitted them in an intermittent manner. Our K-band image of the previously proposed exciting star, IRAC 18064, shows two sources separated by about 240 AU, hinting at its binarity. However, as IRAC 18064 is located off the jet axis at approximately 2064 AU, it is questionable whether this source is the true exciting star. Moreover, the orbital model centred on IRAC 18064 suggests a binary companion at a much larger distance (about 2200 AU) than the nearby star (at about 240 AU). On the other hand, the orbital model centred on the axis provides the best fits. Nevertheless, the precession model, centred on the axis cannot be discarded, despite having larger residuals and chi^2. MHO 2147 displays an S-shaped gentle continuous emission in H_2. We identified two other jets in the field of MHO 2147: a quasi-perpendicular jet previously reported, MHO 2148, and a third jet adjacent to MHO 2147. The model that best fits the morphology of the MHO 2147 jet, as well as its adjacent jet, is precession. The exciting source of MHO 2147 may be a triple system.