The Open UniversitySkip to content
 

Detection of warm water vapour in Taurus protoplanetary discs by Herschel

Riviere-Marichalar, P.; Ménard, F.; Thi, W. F.; Kamp, I.; Montesinos, B.; Meeus, G.; Woitke, P.; Howard, C.; Sandell, G.; Podio, L.; Dent, W. R. F.; Mendigutía, I.; Pinte, C.; White, G. J. and Barrado, D. (2012). Detection of warm water vapour in Taurus protoplanetary discs by Herschel. Astronomy & Astrophysics, 538, article no. L3.

Full text available as:
[img]
Preview
PDF (Version of Record) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (290Kb)
DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1051/0004-6361/201118448
Google Scholar: Look up in Google Scholar

Abstract

Line spectra of 68 Taurus T Tauri stars were obtained with the Herschel-PACS (Photodetector Array Camera and Spectrometer) instrument as part of the GASPS (GAS evolution in Protoplanetary Systems) survey of protoplanetary discs. A careful examination of the linescans centred on the [OI] 63.18 μm fine-structure line unveiled a line at 63.32 μm in some of these spectra. We identify this line with the 818 → 707 transition of ortho-water. It is detected confidently (i.e., >3σ) in eight sources, i.e., ~24% of the sub-sample with gas-rich discs. Several statistical tests were used to search for correlations with other disc and stellar parameters such as line fluxes of [O I] 6300 Å and 63.18 μm; X-ray luminosity and continuum levels at 63 μm and 850 μm. Correlations are found between the water line fluxes and the [O I] 63.18 μm line luminosity, the dust continuum, and possibly with the stellar X-ray luminosity. This is the first time that this line of warm water vapour has been detected in protoplanetary discs. We discuss its origins, in particular whether it comes from the inner disc and/or disc surface or from shocks in outflows and jets. Our analysis favours a disc origin, with the observed water vapour line produced within 2–3 AU from the central stars, where the gas temperature is of the order of 500–600 K.

Item Type: Journal Article
Copyright Holders: 2012 ESO
ISSN: 1432-0746
Extra Information: 5 pp.
Keywords: astrochemistry; star formation; protoplanetary disks; astrobiology; molecular data
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 32538
Depositing User: Glenn White
Date Deposited: 13 Feb 2012 10:27
Last Modified: 24 Oct 2014 17:36
URI: http://oro.open.ac.uk/id/eprint/32538
Share this page:

Altmetrics

Scopus Citations

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk