Infrared OH prompt emission as a proxy of water production in comets: Quantitative analysis of the multiplet near 3046 cm-1 in comets C/1999 H1 (Lee) and C/2001 A2 (LINEAR)

Boncho P. Bonev; Michael J. Mumma; Neil Dello Russo; Erika L. Gibb; Michael A. DiSanti; Karen Magee-Sauer

doi:10.1086/424587

Infrared OH prompt emission as a proxy of water production in comets: Quantitative analysis of the multiplet near 3046 cm^-1 in comets C/1999 H1 (Lee) and C/2001 A2 (LINEAR)

Boncho P. Bonev, Michael J. Mumma, Neil Dello Russo, Erika L. Gibb, Michael A. DiSanti, Karen Magee-Sauer

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Abstract

We report quantitative measurements of OH vibrational prompt emission in comets C/1999 H1 (Lee) and C/2001 A2 (LINEAR) based on high-dispersion infrared spectra acquired at the Keck Observatory atop Mauna Kea, Hawaii. Effective g-factors for four OH lines near 3046 cm^-1 (in the 1-0 band) were obtained from simultaneous detections of OH and H₂O. The measured spatial distribution of this OH "quadruplet" traces that of H ₂O, as expected if the excited OH is produced directly by water photolysis. These results establish OH prompt emission as an alternative (and convenient) proxy for water in comets. Possible limitations to the approach are discussed. Extension to other OH multiplets in the L band will permit direct comparison with theoretical models for the rotational population distribution of the free OH radicals produced by H₂O photolysis in cometary atmospheres.

Original language	English (US)
Pages (from-to)	1048-1053
Number of pages	6
Journal	Astrophysical Journal
Volume	615
Issue number	2 I
DOIs	https://doi.org/10.1086/424587
State	Published - Nov 10 2004

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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title = "Infrared OH prompt emission as a proxy of water production in comets: Quantitative analysis of the multiplet near 3046 cm-1 in comets C/1999 H1 (Lee) and C/2001 A2 (LINEAR)",

abstract = "We report quantitative measurements of OH vibrational prompt emission in comets C/1999 H1 (Lee) and C/2001 A2 (LINEAR) based on high-dispersion infrared spectra acquired at the Keck Observatory atop Mauna Kea, Hawaii. Effective g-factors for four OH lines near 3046 cm-1 (in the 1-0 band) were obtained from simultaneous detections of OH and H2O. The measured spatial distribution of this OH {"}quadruplet{"} traces that of H 2O, as expected if the excited OH is produced directly by water photolysis. These results establish OH prompt emission as an alternative (and convenient) proxy for water in comets. Possible limitations to the approach are discussed. Extension to other OH multiplets in the L band will permit direct comparison with theoretical models for the rotational population distribution of the free OH radicals produced by H2O photolysis in cometary atmospheres.",

author = "Bonev, {Boncho P.} and Mumma, {Michael J.} and Russo, {Neil Dello} and Gibb, {Erika L.} and DiSanti, {Michael A.} and Karen Magee-Sauer",

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month = nov,

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doi = "10.1086/424587",

language = "English (US)",

volume = "615",

pages = "1048--1053",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

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Infrared OH prompt emission as a proxy of water production in comets : Quantitative analysis of the multiplet near 3046 cm^-1 in comets C/1999 H1 (Lee) and C/2001 A2 (LINEAR). / Bonev, Boncho P.; Mumma, Michael J.; Russo, Neil Dello; Gibb, Erika L.; DiSanti, Michael A.; Magee-Sauer, Karen.

In: Astrophysical Journal, Vol. 615, No. 2 I, 10.11.2004, p. 1048-1053.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Infrared OH prompt emission as a proxy of water production in comets

T2 - Quantitative analysis of the multiplet near 3046 cm-1 in comets C/1999 H1 (Lee) and C/2001 A2 (LINEAR)

AU - Bonev, Boncho P.

AU - Mumma, Michael J.

AU - Russo, Neil Dello

AU - Gibb, Erika L.

AU - DiSanti, Michael A.

AU - Magee-Sauer, Karen

PY - 2004/11/10

Y1 - 2004/11/10

N2 - We report quantitative measurements of OH vibrational prompt emission in comets C/1999 H1 (Lee) and C/2001 A2 (LINEAR) based on high-dispersion infrared spectra acquired at the Keck Observatory atop Mauna Kea, Hawaii. Effective g-factors for four OH lines near 3046 cm-1 (in the 1-0 band) were obtained from simultaneous detections of OH and H2O. The measured spatial distribution of this OH "quadruplet" traces that of H 2O, as expected if the excited OH is produced directly by water photolysis. These results establish OH prompt emission as an alternative (and convenient) proxy for water in comets. Possible limitations to the approach are discussed. Extension to other OH multiplets in the L band will permit direct comparison with theoretical models for the rotational population distribution of the free OH radicals produced by H2O photolysis in cometary atmospheres.

AB - We report quantitative measurements of OH vibrational prompt emission in comets C/1999 H1 (Lee) and C/2001 A2 (LINEAR) based on high-dispersion infrared spectra acquired at the Keck Observatory atop Mauna Kea, Hawaii. Effective g-factors for four OH lines near 3046 cm-1 (in the 1-0 band) were obtained from simultaneous detections of OH and H2O. The measured spatial distribution of this OH "quadruplet" traces that of H 2O, as expected if the excited OH is produced directly by water photolysis. These results establish OH prompt emission as an alternative (and convenient) proxy for water in comets. Possible limitations to the approach are discussed. Extension to other OH multiplets in the L band will permit direct comparison with theoretical models for the rotational population distribution of the free OH radicals produced by H2O photolysis in cometary atmospheres.

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Infrared OH prompt emission as a proxy of water production in comets: Quantitative analysis of the multiplet near 3046 cm^-1 in comets C/1999 H1 (Lee) and C/2001 A2 (LINEAR)

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