Water deuterium fractionation in the high-mass star-forming region G34.26+0.15 based on Herschel/HIFI data

Understanding water deuterium fractionation is important for constraining the mechanisms of water formation in interstellar clouds. Observations of HDO and H182O transitions were carried out towards the high-mass star-forming region G34.26+0.15 with the Heterodyne Instrument for the Far-Infrared (HIFI) instrument onboard the Herschel Space Observatory, as well as with ground-based single-dish telescopes. 10 HDO lines and three H182O lines covering a broad range of upper energy levels (22–204 K) were detected. We used a non-local thermal equilibrium 1D analysis to determine the HDO/H2O ratio as a function of radius in the envelope. Models with different water abundance distributions were considered in order to reproduce the observed line profiles. The HDO/H2O ratio is found to be lower in the hot core (∼3.5 × 10−4–7.5 × 10−4) than in the colder envelope (∼1.0 × 10−3–2.2 × 10−3). This is the first time that a radial variation of the HDO/H2O ratio has been found to occur in a high-mass source. The chemical evolution of this source was modelled as a function of its radius and the observations are relatively well reproduced. The comparison between the chemical model and the observations leads to an age of ∼105 yr after the infrared dark cloud stage.

[1]  S. Charnley,et al.  MULTILAYER FORMATION AND EVAPORATION OF DEUTERATED ICES IN PRESTELLAR AND PROTOSTELLAR CORES , 2014, 1405.3268.

[2]  T. Henning,et al.  FIRST TIME-DEPENDENT STUDY OF H2 AND H ORTHO–PARA CHEMISTRY IN THE DIFFUSE INTERSTELLAR MEDIUM: OBSERVATIONS MEET THEORETICAL PREDICTIONS , 2014, 1403.6533.

[3]  E. Dishoeck,et al.  The deuterium fractionation of water on solar-system scales in deeply-embedded low-mass protostars , 2014, 1402.1398.

[4]  T. Henning,et al.  Chemical evolution in the early phases of massive star formation - II. Deuteration , 2015, 1503.06594.

[5]  D. Teyssier,et al.  Localized sources of water vapour on the dwarf planet (1) Ceres , 2014, Nature.

[6]  Eric Herbst,et al.  Interstellar water chemistry: from laboratory to observations. , 2013, Chemical reviews.

[7]  C. Vastel,et al.  Deuterated water in the solar-type protostars NGC 1333 IRAS 4A and IRAS 4B , 2013, 1310.7365.

[8]  Tie Liu,et al.  UNIFORM INFALL TOWARD THE COMETARY H ii REGION IN THE G34.26+0.15 COMPLEX? , 2013, 1309.6365.

[9]  M. Hogerheijde,et al.  Waterfalls around protostars: Infall motions towards Class 0/I envelopes as probed by water , 2013, 1308.5119.

[10]  Miguel de Val-Borro,et al.  A HERSCHEL STUDY OF D/H IN WATER IN THE JUPITER-FAMILY COMET 45P/HONDA–MRKOS–PAJDUŠÁKOVÁ AND PROSPECTS FOR D/H MEASUREMENTS WITH CCAT , 2013, 1307.6869.

[11]  E. Bergin,et al.  THE ABUNDANCE OF H2O AND HDO IN ORION KL FROM HERSCHEL/HIFI , 2013, 1305.2247.

[12]  P. Caselli,et al.  HD depletion in starless cores , 2013, 1304.4031.

[13]  F. D. Tak,et al.  Water in star-forming regions with Herschel (WISH) - IV. A survey of low-J H2O line profiles toward high-mass protostars , 2013, 1304.2949.

[14]  S. Cazaux,et al.  Heavy water stratification in a low-mass protostar , 2013, 1304.2890.

[15]  Qizhou Zhang,et al.  Water deuterium fractionation in the high-mass hot core G34.26+0.15 , 2013 .

[16]  D. Lis,et al.  THE ABUNDANCE, ORTHO/PARA RATIO, AND DEUTERATION OF WATER IN THE HIGH-MASS STAR-FORMING REGION NGC 6334 I , 2012, 1212.5169.

[17]  E. Dishoeck,et al.  Warm water deuterium fractionation in IRAS 16293-2422 - the high-resolution ALMA and SMA view , 2012, 1211.6605.

[18]  Baltimore,et al.  WATER ABSORPTION IN GALACTIC TRANSLUCENT CLOUDS: CONDITIONS AND HISTORY OF THE GAS DERIVED FROM HERSCHEL/HIFI PRISMAS OBSERVATIONS , 2012, 1211.0367.

[19]  C. Ceccarelli,et al.  Water ice deuteration: a tracer of the chemical history of protostars , 2012, 1211.0514.

[20]  R. Garrod,et al.  FROM PRESTELLAR TO PROTOSTELLAR CORES. II. TIME DEPENDENCE AND DEUTERIUM FRACTIONATION , 2012, 1210.2476.

[21]  P. Caselli,et al.  FIRST DETECTION OF WATER VAPOR IN A PRE-STELLAR CORE , 2012, 1208.5998.

[22]  R. Bowden,et al.  The Provenances of Asteroids, and Their Contributions to the Volatile Inventories of the Terrestrial Planets , 2012, Science.

[23]  Miguel de Val-Borro,et al.  Herschel measurements of the D/H and 16O/18O ratios in water in the Oort-cloud comet C/2009 P1 (Garradd) , 2012, 1207.7180.

[24]  V. Wakelam,et al.  CHEMISTRY IN THE FIRST HYDROSTATIC CORE STAGE BY ADOPTING THREE-DIMENSIONAL RADIATION HYDRODYNAMIC SIMULATIONS , 2012, 1207.6693.

[25]  S. Bontemps,et al.  The massive protostar W43-MM1 as seen by Herschel-HIFI water spectra : High turbulence and accretion luminosity , 2012, 1204.0397.

[26]  P. Caselli,et al.  Water in star-forming regions with Herschel (WISH). II. Evolution of 557 GHz 110-101 emission in low-mass protostars , 2012, 1204.0009.

[27]  E. Dishoeck,et al.  Subarcsecond resolution observations of warm water toward three deeply embedded low-mass protostars , 2012, 1203.4969.

[28]  B. Klein,et al.  Terahertz ammonia absorption as a probe of infall in high-mass star forming clumps , 2012, 1203.3406.

[29]  C. Ceccarelli,et al.  Rotational excitation of mono- and doubly-deuterated water by hydrogen molecules , 2012 .

[30]  C. Vastel,et al.  A study of deuterated water in the low-mass protostar IRAS 16293-2422 , 2012, 1201.1785.

[31]  M. Dubernet,et al.  Rotational excitation of 45 levels of ortho/para-H2O by excited ortho/para-H2 from 5 K to 1500 K: state-to-state, effective, and thermalized rate coefficients , 2011 .

[32]  S. Maret,et al.  Nitrogen hydrides and the H2 ortho-to-para ratio in dark clouds , 2011, 1111.1572.

[33]  John C. Pearson,et al.  Detection of the Water Reservoir in a Forming Planetary System , 2011, Science.

[34]  L. Pagani,et al.  Quantum mechanical study of the proton exchange in the ortho-para H2 conversion reaction at low temperature. , 2011, Physical chemistry chemical physics : PCCP.

[35]  Paul Hartogh,et al.  Ocean-like water in the Jupiter-family comet 103P/Hartley 2 , 2011, Nature.

[36]  T. Henning,et al.  NEW EXTENDED DEUTERIUM FRACTIONATION MODEL: ASSESSMENT AT DENSE ISM CONDITIONS AND SENSITIVITY ANALYSIS , 2011, 1110.2644.

[37]  P. Caselli,et al.  INTERSTELLAR ICES AS WITNESSES OF STAR FORMATION: SELECTIVE DEUTERATION OF WATER AND ORGANIC MOLECULES UNVEILED , 2011, 1107.1984.

[38]  L. Pagani,et al.  Ortho-Para H2 Conversion by Proton Exchange at Low Temperature: An Accurate Quantum Mechanical Study , 2011 .

[39]  W. Goss,et al.  A VERY LARGE ARRAY STUDY OF ULTRACOMPACT AND HYPERCOMPACT H ii REGIONS FROM 0.7 TO 3.6 cm , 2011, 1105.1107.

[40]  V. Wakelam,et al.  Oxygen depletion in dense molecular clouds: a clue to a low O_2 abundance? , 2011, 1104.1530.

[41]  E. Dishoeck,et al.  Water deuterium fractionation in the low-mass protostar NGC1333-IRAS2A , 2011, 1101.3880.

[42]  Stephan Ott,et al.  The Herschel Data Processing System - HIPE and Pipelines - Up and Running Since the Start of the Mission , 2010, 1011.1209.

[43]  P. Hennebelle,et al.  Interstellar CH absorption in the diffuse interstellar medium along the sight-lines to G10.6-0.4 (W31C), W49N, and W51 , 2010 .

[44]  K. Menten,et al.  Herschel observations of deuterated water towards Sgr B2(M) , 2010, 1007.5128.

[45]  G. Chattopadhyay,et al.  Reversal of infall in SgrB2(M) revealed by Herschel/HIFI observations of HCN lines at THz frequencies , 2010, 1007.5131.

[46]  A. Giorgio,et al.  Water in massive star-forming regions: HIFI observations of W3 IRS5 , 2010, 1007.3986.

[47]  A. Giorgio,et al.  Water in low-mass star-forming regions with Herschel . HIFI spectroscopy of NGC 1333 , 2010, 1007.3031.

[48]  T. Henning,et al.  Chemistry in Disks. IV. Benchmarking gas-grain chemical models with surface reactions , 2010, 1007.2302.

[49]  P. Hennebelle,et al.  Herschel/HIFI measurements of the ortho/para ratio in water towards Sagittarius B2(M) and W31C , 2010, 1007.1466.

[50]  S. Ott,et al.  Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy , 2010, 1005.5331.

[51]  J. L. Bourlot,et al.  Sensitivity analyses of dense cloud chemical models , 2010, 1004.1902.

[52]  Julie Ziffer,et al.  Water ice and organics on the surface of the asteroid 24 Themis , 2010, Nature.

[53]  E. Dishoeck,et al.  WATER VAPOR IN THE INNER 25 AU OF A YOUNG DISK AROUND A LOW-MASS PROTOSTAR , 2010, 1001.1532.

[54]  Daniel Durand,et al.  Astronomical Data Analysis Software and Systems XI , 2009 .

[55]  M. Accolla,et al.  EXPERIMENTAL EVIDENCE FOR WATER FORMATION VIA OZONE HYDROGENATION ON DUST GRAINS AT 10 K , 2009, 0907.5173.

[56]  A. Kouchi,et al.  FORMATION OF COMPACT AMORPHOUS H2O ICE BY CODEPOSITION OF HYDROGEN ATOMS WITH OXYGEN MOLECULES ON GRAIN SURFACES , 2009 .

[57]  S. Schlemmer,et al.  H3(+) + H2 isotopic system at low temperatures: microcanonical model and experimental study. , 2009, The Journal of chemical physics.

[58]  V. Pirronello,et al.  Experimental evidence for water formation on interstellar dust grains by hydrogen and oxygen atoms , 2009, 0903.3120.

[59]  E. V. van Dishoeck,et al.  PHOTODESORPTION OF ICES. II. H2O AND D2O , 2008, 0812.1918.

[60]  V. Wakelam,et al.  Cold CO in circumstellar disks - On the effects of photodesorption and vertical mixing , 2008, 0812.1714.

[61]  A. Kouchi,et al.  Ice surface reactions : A key to chemical evolution in space , 2008 .

[62]  C. Vastel,et al.  Chemical modeling of L183 (= L134N) : an estimate of the ortho/para H2 ratio , 2008, 0810.1861.

[63]  D. Hollenbach,et al.  WATER, O2, AND ICE IN MOLECULAR CLOUDS , 2008, 0809.1642.

[64]  E. F. Dishoeck,et al.  Laboratory Evidence for Efficient Water Formation in Interstellar Ices , 2008, 0807.0129.

[65]  A. Kouchi,et al.  Formation of hydrogen peroxide and water from the reaction of cold hydrogen atoms with solid oxygen at 10 K , 2008, 0805.0055.

[66]  P. Bernath,et al.  A spectral line survey of Orion KL in the bands 486-492 and 541-577 GHz with the Odin satellite II. Data analysis , 2007, 0910.1815.

[67]  C. Greene,et al.  Dissociative recombination of H3+ in the ground and excited vibrational states , 2007, 0708.2715.

[68]  H. Zinnecker,et al.  Toward Understanding Massive Star Formation , 2007, 0707.1279.

[69]  Urbana,et al.  Kinematics and Chemistry of the Hot Molecular Core in G34.26+0.15 at High Resolution , 2007, astro-ph/0701827.

[70]  Durham,et al.  The abundances of nitrogen-containing molecules during pre-protostellar collapse , 2006, astro-ph/0607114.

[71]  G. P. Forêts,et al.  The importance of the ortho:para H2 ratio for the deuteration of molecules during pre-protostellar collapse , 2006, astro-ph/0601429.

[72]  C. Kramer,et al.  The Herschel-Heterodyne Instrument for the Far-Infrared (HIFI) , 2005, Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004..

[73]  C. Ceccarelli,et al.  Water in the envelopes and disks around young high-mass stars , 2005, astro-ph/0510640.

[74]  P. Schilke,et al.  High-Mass Starless Cores , 2005, astro-ph/0508421.

[75]  Holger S. P. Müller,et al.  The Cologne Database for Molecular Spectroscopy, CDMS: a useful tool for astronomers and spectroscopists , 2005 .

[76]  G. P. Forêts,et al.  Multiply-deuterated species in prestellar cores. , 2004 .

[77]  R. Saykally,et al.  Dissociative recombination of rotationally cold H3 , 2004 .

[78]  A. Tielens,et al.  HDO abundance in the envelope of the solar-type protostar IRAS 16293–2422 , 2004, astro-ph/0410619.

[79]  W. Goss,et al.  Broad Radio Recombination Lines from Hypercompact H II Regions , 2004 .

[80]  G. P. Forêts,et al.  Complete depletion in prestellar cores , 2004, astro-ph/0402493.

[81]  J. Greenberg,et al.  Cosmic ray induced explosive chemical desorption in dense clouds , 2004 .

[82]  R. Piña,et al.  A Search for Mid-Infrared Emission from Hot Molecular Core Candidates , 2003, astro-ph/0307155.

[83]  E. Herbst,et al.  The abundance of gaseous H$_{\mathsf 2}$O and O$_{\mathsf 2}$ in cores of dense interstellar clouds , 2002 .

[84]  J. Cernicharo,et al.  Deuterium Enhancement in Water toward Orion IRc2 Deduced from HDO Lines above 800 GHz , 2001 .

[85]  David A. Williams,et al.  Thermal desorption of water ice in the interstellar medium , 2001, astro-ph/0107487.

[86]  G. Fuller,et al.  SiO in G34.26: Outflows and shocks in a high mass star forming region , 2001 .

[87]  Holger S. P. Müller,et al.  THE COLOGNE DATABASE FOR MOLECULAR SPECTROSCOPY, CDMS , 2001 .

[88]  L. H. Andersen,et al.  Dissociative Recombination of H3O+, HD2O+, and D3O+ , 2000 .

[89]  L. Mundy,et al.  Molecular Environments of Young Massive Stars: G34.26+0.15, G11.94–0.62, G33.92+0.11, and IRAS 18511+0146 , 1999 .

[90]  P. Goldsmith,et al.  Population Diagram Analysis of Molecular Line Emission , 1999 .

[91]  T. Wilson.  Isotopes in the interstellar medium and circumstellar envelopes , 1999 .

[92]  E. Bergin,et al.  Formation of Interstellar Ices behind Shock Waves , 1998, astro-ph/9811228.

[93]  J. Hatchell,et al.  A survey of molecular line emission towards ultracompact HII regions , 1998 .

[94]  Alwyn Wootten,et al.  Deuterated Water in Comet C/1996 B2 (Hyakutake) and Its Implications for the Origin of Comets☆ , 1998 .

[95]  P. Caselli,et al.  A Proposed Modification of the Rate Equations for Reactions on Grain Surfaces , 1998 .

[96]  T. Millar,et al.  A 330-360 GHz spectral survey of G 34.3+0.15. I. Data and physical analysis , 1996 .

[97]  P. Caselli,et al.  The Line Width--Size Relation in Massive Cloud Cores , 1995 .

[98]  T. Bania,et al.  Kinematic Distances of Galactic H II Regions from H i Absorption Studies , 1994 .

[99]  M. Claussen,et al.  VLA RECOMBINATION LINE OBSERVATIONS OF THE COMETARY H II REGION G34.3+0.2 : DYNAMICS AND PHYSICAL PROPERTIES , 1994 .

[100]  E. Herbst,et al.  New gas–grain chemical models of quiescent dense interstellar clouds: the effects of H2 tunnelling reactions and cosmic ray induced desorption , 1993 .

[101]  E. Herbst,et al.  Models of gas-grain chemistry in dense interstellar clouds with complex organic molecules , 1992 .

[102]  E. Churchwell,et al.  The morphologies and physical properties of ultracompact H II regions , 1989 .

[103]  B. Rowe,et al.  Reactions of N+(3P) ions with normal, para, and deuterated hydrogens at low temperatures , 1988 .

[104]  G. Garay,et al.  Rotating and Expanding Ultracompact H II Regions , 1986 .

[105]  H. Müller,et al.  Submillimeter, millimeter, and microwave spectral line catalog. , 1985, Applied optics.

[106]  G. Garay,et al.  Compact H II regions: hydrogen recombination and OH maser lines , 1985 .

[107]  S. Prasad,et al.  UV radiation field inside dense clouds: its possible existence and chemical implications , 1983 .

[108]  B. Balick,et al.  Fine structure in H II regions. II , 1974 .

[109]  Michael Olberg,et al.  In-orbit performance of Herschel-HIFI , 2012 .

[110]  E. Dishoeck,et al.  Subarcsecond resolution observations of warm water toward three deeply embedded low-mass protostars , 2012, 1203.4969.

[111]  Robert Mann,et al.  Astronomical Data Analysis Software and Systems XXI , 2012 .

[112]  M. Reid,et al.  G34.3 + 0.2 - A 'cometary' H II region , 1985 .