pith. sign in

arxiv: 1906.06548 · v1 · pith:YFPISVMPnew · submitted 2019-06-15 · 🌌 astro-ph.SR · astro-ph.GA

Substructures in the Keplerian disc around the O-type (proto)star G17.64+0.16

L. T. Maud , R. Cesaroni , M. S. N. Kumar , V. M. Rivilla , A. Ginsburg , P. D. Klaassen , D. Harsono , A. Sanchez-Monge
show 15 more authors
A. Ahmadi V. Allen M. T. Beltran H. Beuther R. Galvan-Madrid C. Goddi M. G. Hoare M. R. Hogerheijde K. G. Johnston R. Kuiper L. Moscadelli T. Peters L. Testi F. F. S. van der Tak W. J. de Wit
This is my paper
classification 🌌 astro-ph.SR astro-ph.GA
keywords disckeplerianlinearoundcurrentlymasso-typeobservations
0
0 comments X
read the original abstract

We present the highest angular resolution (20x15mas - 44x33au) Atacama Large Millimeter/sub-millimeter Array (ALMA) observations currently possible of the proto-O-star G17.64+0.16 in Band 6. The Cycle 5 observations with baselines out to 16km probes scales <50au and reveal the rotating disc around G17.64+0.16, a massive forming O-type star. The disc has a ring-like enhancement in the dust emission, especially visible as arc structures to the north and south. The Keplerian kinematics are most prominently seen in the vibrationally excited water line, H2O (Eu=3461.9K). The mass of the central source found by modelling the Keplerian rotation is consistent with 45+/-10Mo. The H30alpha (231.9GHz) radio-recombination line and the SiO (5-4) molecular line were detected at up to the 10 sigma$ level. The estimated disc mass is 0.6-2.6Mo under the optically thin assumption. Analysis of the Toomre Q parameter, in the optically thin regime, indicates that the disc stability is highly dependent on temperature. The disc currently appears stable for temperatures >150K, this does not preclude that the substructures formed earlier through disc fragmentation.

This paper has not been read by Pith yet.

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Global and Local Infall in the ASHES Sample (GLASHES). II. Asymmetric Line Profiles around Dense Cores in 70 $\mu$m Dark Massive Clumps

    astro-ph.GA 2026-05 conditional novelty 6.0

    Blue-asymmetric spectral lines appear in 50-60% of dense cores within massive dark clumps, showing that gravitational collapse operates at core scales from prestellar stages onward and supports hierarchical star formation.