74 research outputs found
MISALIGNED DISKS IN THE BINARY PROTOSTAR IRS 43
Recent high angular resolution (0.2") ALMA observations of the 1.1 mm
continuum and of HCO+ J=3-2 and HCN J=3-2 gas towards the binary protostar IRS
43 reveal multiple Keplerian disks which are significantly misaligned (
60), both in inclination and position angle and also with respect to
the binary orbital plane. Each stellar component has an associated
circumstellar disk while the binary is surrounded by a circumbinary disk.
Together with archival VLA measurements of the stellar positions over 25 years,
and assuming a circular orbit, we use our continuum measurements to determine
the binary separation, a = 74 4 AU, and its inclination, i
30. The misalignment in this system suggests that turbulence has likely
played a major role in the formation of IRS 43.Comment: 7 pages, 4 figure
A UV-to-NIR Study of Molecular Gas in the Dust Cavity around RY Lupi
We present a study of molecular gas in the inner disk (r ā¼ 0.4Ā± 0.1 au; {r(narrow,Hā)} ā¼ 3Ā± 2 au). The 4.7 Ī¼m Ā¹Ā²CO emission lines are also well fit by two-component profiles ( {{r}broad,CO} =0.4Ā± 0.1 au; {{r}narrow,CO} =15Ā± 2 au). We combine these results with 10 Ī¼m observations to form a picture of gapped structure within the mm-imaged dust cavity, providing the first such overview of the inner regions of a young disk. The HST SED of RY Lupi is available online for use in modeling efforts
FROM PLANETESIMALS TO PLANETS IN TURBULENT PROTOPLANETARY DISKS. I. ONSET OF RUNAWAY GROWTH
DUST DYNAMICS IN PROTOPLANETARY DISK WINDS DRIVEN BY MAGNETOROTATIONAL TURBULENCE: A MECHANISM FOR FLOATING DUST GRAINS WITH CHARACTERISTIC SIZES
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