ALMA discovery of a rotating SO/SO2 flow in HH212

B. Tabone (1) , S. Cabrit (1) , E. Bianchi , J. Ferreira , G. Pineau Des Forêts (2, 1) , C. Codella , A. Gusdorf (1) , F. Gueth (3) , L. Podio (4) , E. Chapillon (5)

1 LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique
2 IAS - Institut d'astrophysique spatiale
3 IRAM - Institut de RadioAstronomie Millimétrique
4 OAA - INAF - Osservatorio Astrofisico di Arcetri
5 AMOR 2017

We wish to constrain the possible contribution of a magnetohydrodynamic disk wind (DW) to the HH212 molecular jet. We mapped the flow base with ALMA Cycle 4 at 0.̋13 ~ 60 au resolution and compared these observations with synthetic DW predictions. We identified, in SO/SO2, a rotating flow that is wider and slower than the axial SiO jet. The broad outflow cavity seen in C34S is not carved by a fast wide-angle wind but by this slower agent. Rotation signatures may be fitted by a DW of a moderate lever arm launched out to ~40 au with SiO tracing dust-free streamlines from 0.05−0.3 au. Such a DW could limit the core-to-star efficiency to ≤50%.

Mots clés: stars: formation; ISM: jets and outflows; ISM: individual objects: HH212

Domaines: Astrophysique [astro-ph]; Astrophysique [astro-ph]

B. Tabone, S. Cabrit, E. Bianchi, J. Ferreira, G. Pineau Des Forêts, et al.. ALMA discovery of a rotating SO/SO2 flow in HH212: A possible MHD disk wind?. Astronomy and Astrophysics - A&A, 2017, 607, pp.L6. ⟨10.1051/0004-6361/201731691⟩. ⟨hal-02238172⟩