Herschel/HIFI Search For H2-17O And H2-18O In IRC+10216 ... - ArXiv

Astrophysics > Astrophysics of Galaxies arXiv:1302.6233 (astro-ph) [Submitted on 25 Feb 2013] Title:Herschel/HIFI search for H2-17O and H2-18O in IRC+10216: constraints on models for the origin of water vapor Authors:David A. Neufeld (JHU), Volker Tolls (CfA), Marcelino Agúndez (Bordeaux), Eduardo González-Alfonso (Alcalá de Henares), Leen Decin (KU Leuven & Amsterdam), Fabien Daniel (CAB), José Cernicharo (CAB), Gary J. Melnick (CfA), Miroslaw Schmidt (N. Copernicus), Ryszard Szczerba (N. Copernicus) View a PDF of the paper titled Herschel/HIFI search for H2-17O and H2-18O in IRC+10216: constraints on models for the origin of water vapor, by David A. Neufeld (JHU) and 8 other authors View PDF

Abstract:We report the results of a sensitive search for the minor isotopologues of water, H2-17O and H2-18O, toward the carbon-rich AGB star IRC+10216 (a.k.a. CW Leonis) using the HIFI instrument on the Herschel Space Observatory. This search was motivated by the fact that any detection of isotopic enhancement in the H2-17O and H2-18O abundances would have strongly implicated CO photodissociation as the source of the atomic oxygen needed to produce water in a carbon-rich circumstellar envelope. Our observations place an upper limit of 1/470 on the H2-17O/H2-16O abundance ratio. Given the isotopic 17O/16O ratio of 1/840 inferred previously for the photosphere of IRC+10216, this result places an upper limit of a factor 1.8 on the extent of any isotope-selective enhancement of H2-17O in the circumstellar material, and provides an important constraint on any model that invokes CO photodissociation as the source of O for H2O production. In the context of the clumpy photodissociation model proposed previously for the origin of water in IRC+10216, our limit implies that 12C-16O (not 13C-16O or SiO) must be the dominant source of 16O for H2O production, and that the effects of self-shielding can only have reduced the 12C-16O photodissociation rate by at most a factor ~ 2.

Comments:	14 pages, 4 figures, accepted for publication in ApJ Letters
Subjects:	Astrophysics of Galaxies (astro-ph.GA)
Cite as:	arXiv:1302.6233 [astro-ph.GA]
(or arXiv:1302.6233v1 [astro-ph.GA] for this version)
https://doi.org/10.48550/arXiv.1302.6233 Focus to learn more arXiv-issued DOI via DataCite
Related DOI:	https://doi.org/10.1088/2041-8205/767/1/L3 Focus to learn more DOI(s) linking to related resources

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From: David Neufeld [view email] [v1] Mon, 25 Feb 2013 21:00:00 UTC (23 KB) Full-text links:

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