Searching for the HH31 counter-jet in the protostar IRAS 04248+2612

L. FERRERO; E. ARTUR DEL LA VILLARMOIS; M. GOMEZ

Buenos Aires

Congreso; 64 Reunión Anual de la Asociación Argentina de Astronomía; 2022

Asociación Argentina de Astronomía

During the initial stages of the stellar collapse (the class 0 and I phases with ages of 10^4 −10^5 yr), the incipient star begins to eject winds along the rotation axis. These winds alleviate the angular momentum accumulation, help to stop the collapse and give rise to the jets and/or Herbig-Haro (HH) objects detected in the optical. Although most jets are straight or collimated, a small fraction have curved shapes. Different mechanisms can produce the non-straight jets, binarity or multiplicity of the driving source being one of them. This work shows preliminary results on the study of the sinusoidal HH 31 jet and its driving source, the low-mass Class I protostar IRAS 04248+2612, located in the Taurus-Auriga star-forming region. Other authors have detected the binarity of the central source, where the separation between the components is of 0.1600 (around 24 AU, at a distance of 140 pc), and identified a dark lane perpendicular to the jet, which could be related to an edge-on disk, but no further analysis has been done. Furthermore, only the jet have been detected, while the counter-jet could be embedded or optical hidden by the cloud extinction in the near infrared. In this contribution, we report progress on the analysis with high-resolution Gemini NIRI 2.12 μm H2 line (a well-known tracer of s hock-excited regions) and K-band images. The aim of this work is to detect the NIR counter-jet of HH31 as well as to investigate the likely cause–effect relation between the S-shape morphology and the central star and circumstellar disk properties.