Possible episodic infall towards a compact disk in B335
نویسندگان
چکیده
Context. Previous observations of the isolated Class 0 source B335 have presented evidence ongoing infall in various molecular lines, such as HCO + , HCN, and CO. There been no confirmed a rotationally supported disk on scales greater than ~12 au. Aims. The presence an outflow suggests that is also expected to be present or undergoing formation. To constrain earliest stages protostellar evolution formation, we aim map region where gas falls inwards observationally its kinematics. Furthermore, put strong limits size orientation any disk-like structure B335. Methods. We used high angular resolution 13 CO data from Atacama Large Millimeter/submillimeter Array (ALMA) combined it with shorter-baseline archival produce high-fidelity image revisited imaging high-angular Band 6 continuum study dust distribution immediate vicinity Results. Continuum emission shows elliptical (10 by 7 au) position angle 5 degrees east north, consistent expectation for forming A velocity (as estimated emission), asymmetric infall, predominantly north south. Close protostar, velocities appear exceed free-fall velocities. Three-dimensional (3D) radiative transfer models, allowed vary within region, may explain observed Conclusions. suggest has started form falling towards disk. However, kinematically-resolved line itself needed confirm around this young protostar. measured are not easily reconcilable magnetic braking scenario, suggesting there pressure gradient allows region.
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1 Observatoire Astronomique de Strasbourg, 11 Rue de l’Université, F–67000 Strasbourg, France email: [email protected] 2 International Space University, Parc d’Innovation, 1 Rue Jean-Dominique Cassini, F–67400 IllkirchGraffenstaden, France 3 Institut für Astronomie, Universitäts-Sternwarte Wien, Türkenschanzstr. 17, A–1180 Vienna, Austria email: [email protected] 4 Institut für...
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ژورنال
عنوان ژورنال: Astronomy and Astrophysics
سال: 2023
ISSN: ['0004-6361', '1432-0746']
DOI: https://doi.org/10.1051/0004-6361/202245195