Universität zu Köln

Maud, L. T., Cesaroni, R., Kumar, M. S. N., Rivilla, V. M., Ginsburg, A., Klaassen, P. D., Harsono, D., Sanchez-Monge, A., Ahmadi, A., Allen, V, Beltran, M. T., Beuther, H., Galvan-Madrid, R., Goddi, C., Hoare, M. G., Hogerheijde, M. R., Johnston, K. G., Kuiper, R., Moscadelli, L., Peters, T., Testi, L., van der Tak, F. F. S. and de Wit, W. J. (2019). Substructures in the Keplerian disc around the O-type (proto-)star G17.64+0.16. Astron. Astrophys., 627. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

We present the highest angular resolution (similar to 20 x 15 mas-44 x 33 au) Atacama Large Millimeter/sub-millimeter Array (ALMA) observations that are currently possible of the proto-O-star G17.64+0.16 in Band 6. The Cycle 5 observations with baselines out to 16 km probe scales <50 au 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 that is especially visible as arc structures to the north and south. The Keplerian kinematics are most prominently seen in the vibrationally excited water line, H2O 5(5,0)-6(4,3) nu(2) = 1 (E-u = 3461.9 K). The mass of the central source found by modelling the Keplerian rotation is consistent with 45 +/- 10 M-circle dot. The H30 alpha (231.9 GHz) radio-recombination line and the SiO (5-4) molecular line were detected at up to the similar to 10 sigma level. The estimated disc mass is 0.6-2.6 M-circle dot 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 >150 K; this does not preclude that the substructures formed earlier through disc fragmentation.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Maud, L. T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cesaroni, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kumar, M. S. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rivilla, V. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ginsburg, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Klaassen, P. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Harsono, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sanchez-Monge, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ahmadi, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Allen, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Beltran, M. T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Beuther, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Galvan-Madrid, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goddi, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hoare, M. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hogerheijde, M. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Johnston, K. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kuiper, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Moscadelli, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Peters, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Testi, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED van der Tak, F. F. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED de Wit, W. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-135306
DOI:	10.1051/0004-6361/201935633
Journal or Publication Title:	Astron. Astrophys.
Volume:	627
Date:	2019
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INFRARED REFLECTION NEBULA; RADIATIVE-TRANSFER; SPIRAL ARMS; EVOLUTION; SIMULATIONS; PROTOSTARS; ENVELOPES; CONTINUUM; EMISSION; CRL-2136 Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13530