The HDO/H2O Ratio in Gas in the Inner Regions of a Low-mass Protostar

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Standard

The HDO/H2O Ratio in Gas in the Inner Regions of a Low-mass Protostar. / Jørgensen, Jes Kristian; van Dishoeck, Ewine F.

In: Astrophysics Journal Letters, Vol. 725, No. 2, 01.12.2010, p. 172.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Jørgensen, JK & van Dishoeck, EF 2010, 'The HDO/H2O Ratio in Gas in the Inner Regions of a Low-mass Protostar', Astrophysics Journal Letters, vol. 725, no. 2, pp. 172. https://doi.org/10.1088/2041-8205/725/2/L172

APA

Jørgensen, J. K., & van Dishoeck, E. F. (2010). The HDO/H2O Ratio in Gas in the Inner Regions of a Low-mass Protostar. Astrophysics Journal Letters, 725(2), 172. https://doi.org/10.1088/2041-8205/725/2/L172

Vancouver

Jørgensen JK, van Dishoeck EF. The HDO/H2O Ratio in Gas in the Inner Regions of a Low-mass Protostar. Astrophysics Journal Letters. 2010 Dec 1;725(2):172. https://doi.org/10.1088/2041-8205/725/2/L172

Author

Jørgensen, Jes Kristian ; van Dishoeck, Ewine F. / The HDO/H2O Ratio in Gas in the Inner Regions of a Low-mass Protostar. In: Astrophysics Journal Letters. 2010 ; Vol. 725, No. 2. pp. 172.

Bibtex

@article{5a47ead74c694cf39f4730565e319141,
title = "The HDO/H2O Ratio in Gas in the Inner Regions of a Low-mass Protostar",
abstract = "The HDO/H2O abundance ratio is thought to be a key diagnostic for the evolution of water during the star and planet formation process and thus for its origin on Earth. We here present millimeter-wavelength high angular resolution observations of the deeply embedded protostar NGC 1333-IRAS4B from the Submillimeter Array targeting the 312-221 transition of HDO at 225.6 GHz (Eu = 170 K). We do not (or only very tentatively) detect the HDO line toward the central protostar, contrasting the previous prominent detection of a line from another water isotopologue, H18 2O, with similar excitation properties using the IRAM Plateau de Bure Interferometer. The non-detection of the HDO line provides a direct, model-independent, upper limit to the HDO/H2O abundance ratio of 6 × 10-4 (3s) in the warm gas associated with the central protostar. This upper limit suggests that the HDO/H2O abundance ratio is not significantly enhanced in the inner ˜50 AU around the protostar relative to what is seen in comets and Earth's oceans and does not support previous suggestions of a generally enhanced HDO/H2O ratio in these systems.",
author = "J{\o}rgensen, {Jes Kristian} and {van Dishoeck}, {Ewine F.}",
year = "2010",
month = dec,
day = "1",
doi = "10.1088/2041-8205/725/2/L172",
language = "English",
volume = "725",
pages = "172",
journal = "The Astrophysical Journal Letters",
issn = "2041-8205",
publisher = "IOP Publishing",
number = "2",

}

RIS

TY - JOUR

T1 - The HDO/H2O Ratio in Gas in the Inner Regions of a Low-mass Protostar

AU - Jørgensen, Jes Kristian

AU - van Dishoeck, Ewine F.

PY - 2010/12/1

Y1 - 2010/12/1

N2 - The HDO/H2O abundance ratio is thought to be a key diagnostic for the evolution of water during the star and planet formation process and thus for its origin on Earth. We here present millimeter-wavelength high angular resolution observations of the deeply embedded protostar NGC 1333-IRAS4B from the Submillimeter Array targeting the 312-221 transition of HDO at 225.6 GHz (Eu = 170 K). We do not (or only very tentatively) detect the HDO line toward the central protostar, contrasting the previous prominent detection of a line from another water isotopologue, H18 2O, with similar excitation properties using the IRAM Plateau de Bure Interferometer. The non-detection of the HDO line provides a direct, model-independent, upper limit to the HDO/H2O abundance ratio of 6 × 10-4 (3s) in the warm gas associated with the central protostar. This upper limit suggests that the HDO/H2O abundance ratio is not significantly enhanced in the inner ˜50 AU around the protostar relative to what is seen in comets and Earth's oceans and does not support previous suggestions of a generally enhanced HDO/H2O ratio in these systems.

AB - The HDO/H2O abundance ratio is thought to be a key diagnostic for the evolution of water during the star and planet formation process and thus for its origin on Earth. We here present millimeter-wavelength high angular resolution observations of the deeply embedded protostar NGC 1333-IRAS4B from the Submillimeter Array targeting the 312-221 transition of HDO at 225.6 GHz (Eu = 170 K). We do not (or only very tentatively) detect the HDO line toward the central protostar, contrasting the previous prominent detection of a line from another water isotopologue, H18 2O, with similar excitation properties using the IRAM Plateau de Bure Interferometer. The non-detection of the HDO line provides a direct, model-independent, upper limit to the HDO/H2O abundance ratio of 6 × 10-4 (3s) in the warm gas associated with the central protostar. This upper limit suggests that the HDO/H2O abundance ratio is not significantly enhanced in the inner ˜50 AU around the protostar relative to what is seen in comets and Earth's oceans and does not support previous suggestions of a generally enhanced HDO/H2O ratio in these systems.

U2 - 10.1088/2041-8205/725/2/L172

DO - 10.1088/2041-8205/725/2/L172

M3 - Journal article

VL - 725

SP - 172

JO - The Astrophysical Journal Letters

JF - The Astrophysical Journal Letters

SN - 2041-8205

IS - 2

ER -

ID: 35114119