Universität zu Köln

Drozdovskaya, Maria N., van Dishoeck, Ewine F., Jorgensen, Jes K., Calmonte, Ursina, van der Wiel, Matthijs H. D., Coutens, Audrey ORCID: 0000-0003-1805-3920, Calcutt, Hannah ORCID: 0000-0003-3393-294X, Mueller, Holger S. P., Bjerkeli, Per ORCID: 0000-0002-7993-4118, Persson, Magnus V., Wampfler, Susanne F. and Altwegg, Kathrin (2018). The ALMA-PILS survey: the sulphur connection between protostars and comets: IRAS 16293-2422 B and 67P/Churyumov-Gerasimenko. Mon. Not. Roy. Astron. Soc., 476 (4). S. 4949 - 4965. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

The evolutionary past of our Solar system can be pieced together by comparing analogous low-mass protostars with remnants of our Protosolar Nebula - comets. Sulphur-bearing molecules may be unique tracers of the joint evolution of the volatile and refractory components. ALMA Band 7 data from the large unbiased Protostellar Interferometric Line Survey are used to search for S-bearing molecules in the outer disc-like structure, similar to 60 au from IRAS 16293-2422 B, and are compared with data on 67P/Churyumov-Gerasimenko (67P/C-G) stemming from the ROSINA (Rosetta Orbiter Spectrometer for Ion and Neutral Analysis) instrument aboard Rosetta. Species such as SO2, SO, OCS, CS, H2CS, H2S, and CH3SH are detected via at least one of their isotopologues towards IRAS 16293-2422 B. The search reveals a first-time detection of (OCS)-S-33 towards this source and a tentative first-time detection of (CS)-S-36 towards a low-mass protostar. The data show that IRAS 16293-2422 B contains much more OCS than H2S in comparison to 67P/C-G; meanwhile, the SO/SO2 ratio is in close agreement between the two targets. IRAS 16293-2422 B has a CH3SH/H2CS ratio in range of that of our Solar system (differences by a factor of 0.7-5.3). It is suggested that the levels of UV radiation during the initial collapse of the systems may have varied and have potentially been higher for IRAS 16293-2422 B due to its binary nature; thereby, converting more H2S into OCS. It remains to be conclusively tested if this also promotes the formation of S-bearing complex organics. Elevated UV levels of IRAS 16293-2422 B and a warmer birth cloud of our Solar system may jointly explain the variations between the two low-mass systems.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Drozdovskaya, Maria N. UNSPECIFIED UNSPECIFIED UNSPECIFIED van Dishoeck, Ewine F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jorgensen, Jes K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Calmonte, Ursina UNSPECIFIED UNSPECIFIED UNSPECIFIED van der Wiel, Matthijs H. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Coutens, Audrey UNSPECIFIED orcid.org/0000-0003-1805-3920 UNSPECIFIED Calcutt, Hannah UNSPECIFIED orcid.org/0000-0003-3393-294X UNSPECIFIED Mueller, Holger S. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bjerkeli, Per UNSPECIFIED orcid.org/0000-0002-7993-4118 UNSPECIFIED Persson, Magnus V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wampfler, Susanne F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Altwegg, Kathrin UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-185328
DOI:	10.1093/mnras/sty462
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	476
Number:	4
Page Range:	S. 4949 - 4965
Date:	2018
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DENSE INTERSTELLAR CLOUDS; SUBMILLIMETER-WAVE SPECTRUM; CARBONYL SULFIDE OCS; MASS STAR-FORMATION; MICROWAVE-SPECTRUM; CHEMICAL-COMPOSITION; ROTATIONAL SPECTRUM; DIPOLE-MOMENT; ORGANOSULFUR CHEMISTRY; CENTRIFUGAL-DISTORTION Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/18532