Aperture Synthesis Observations Toward The Protostellar Systems L1551 Irs 5 And Hl Tau: Rotation In The Infalling Envelope

Details Aperture Synthesis Observations Toward The Protostellar Systems L1551 Irs 5 And Hl Tau: Rotation In The Infalling Envelope Aperture Synthesis Observations Toward The Protostellar Systems L1551 Irs 5 And Hl Tau: Rotation In The Infalling Envelope

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21943702s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #437.02

Astronomy and Astrophysics

Astronomy

Scientific paper

We present aperture synthesis observations of 13CO (J=1-0 and 2-1) emissions toward the low-mass protostellar binary, L1551 IRS 5 and the low-mass single protostar HL Tau, conducted with the Nobeyama Millimeter Array. The purpose of these observations is to reveal the dense envelope structure particularly rotational structure which is a key to understanding formation of single and binary stars. Since both L1551 IRS 5 and HL Tau were born in the Lynds 1551 Dark Cloud, they formed in a similar interstellar environment. Combined with the past data, our 13CO (J=1-0) data have revealed that both the protostars are surrounded by a 1000-AU scale dense envelope perpendicular to the jet/outflow, presumably infalling to the star/disk system. In contrast, a rotating motion is dominant in the envelope of L1551 IRS 5 in 13CO (J=2-1) while a prominent rotating motion is not discerned in the envelope of HL Tau in 13CO (J=2-1). Our results show that local specific angular momenta of the dense envelope around L1551 IRS 5 and HL Tau is roughly constant and that of L1551 IRS 5 is larger by nearly an order of magnitude than that of HL Tau. This observational fact suggests that a dense core rotating fast initially tends to form a binary system as predicted by theoretical studies. Furthermore, since the specific angular momentum is roughly constant in the infalling envelope over a factor of 10 in size, we suggest that the initial rotating structure of the dense core forming L1551 IRS 5 is not a solid body rotations rather faster rotation in the inner region.

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