A dataset provided by the European Space Agency

Name OT2_dneufeld_6
Title Probing the mystery of water vapour in carbon-rich stars: a search for the H2-17O and H2-18O isotopologues of water toward IRC+10216


DOI https://doi.org/10.5270/esa-0mbmaa2
Author neufeld, d.
Description Using the HIFI instrument, we propose to investigate further the puzzling - but widespread appearance of water vapour in carbon-rich stars. Following up on our discovery that water vapour is present in the warm inner envelope of the carbon rich AGB star IRC+10216, we will carry out a sensitive search for the minor isotopologues, H2-17O and H2-18O. The abundances of these species will provide a critical test of competing models for the origin of the water vapour present in the inner envelope. If the production of water vapor is initiated by the photodissociation of CO by UV radiation, as proposed by Decin et al. (2010) and Agndez et al. (2010), then enhancements in the H2-17O-H2-16O and H2-18O-H2-16O ratios are expected; however, if non-equilibrium chemistry initiated by pulsationally-driven shock waves is responsible - an alternative mechanism proposed recently by Cherchneff (2011) - then no such enhancement will be observed.
Publication Discovery of Time Variation of the Intensity of Molecular Lines in IRC+10216 in the Submillimeter and Far-Infrared Domains . Cernicharo J. et al. . The Astrophysical Journal Letters, Volume 796, Issue 1, article id. L21, 6 pp. (2014). . 796 . 10.1088/2041-8205/796/1/L21 . 2014ApJ...796L..21C ,
Herschel-HIFI Search for H_2^{17}O and H_2^{18}O in IRC+10216: Constraints on Models for the Origin of Water Vapor . Neufeld David A. et al. . The Astrophysical Journal Letters, Volume 767, Issue 1, article id. L3, 5 pp. (2013). . 767 . 10.1088/2041-8205/767/1/L3 . 2013ApJ...767L...3N ,
Instrument HIFI_HifiPoint_dbs
Temporal Coverage 2012-05-17T21:58:51Z/2012-05-18T10:13:44Z
Version SPG v14.1.0
Mission Description Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/h®erschel/
Date Published 2012-11-18T10:11:03Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2012-11-18T10:11:03Z, OT2_dneufeld_6, SPG v14.1.0. https://doi.org/10.5270/esa-0mbmaa2