Detection of the hydroperoxyl radical HO2 toward ρ Ophiuchi A - Additional constraints on the water chemical network
@article{Parise2012DetectionOT, title={Detection of the hydroperoxyl radical HO2 toward $\rho$ Ophiuchi A - Additional constraints on the water chemical network}, author={B{\'e}reng{\`e}re Parise and Per Bergman and Fujun Du}, journal={Astronomy and Astrophysics}, year={2012}, volume={541} }
Context. Hydrogen peroxide (HOOH) was recently detected toward ρ Oph A. Subsequent astrochemical modeling that included reactions in the gas phase and on the surface of dust grains was able to explain the observed abundance, and highlighted the importance of grain chemistry in the formation of HOOH as an intermediate product in water formation. This study also predicted that the hydroperoxyl radical HO2, the precursor of HOOH, should be detectable.
Aims. We aim at detecting the hydroperoxyl…
28 Citations
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A search for HOOH in a diverse sample of sources in different environments, including low-mass protostars and regions with very high column densities, such as Infrared Dark Clouds (IRDCs), which does not detect the molecule in any other source than Oph A, and derive 3sigma upper limits for the abundance of HooH relative to H2 lower than that in OPH A for most sources.
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The observations indicate that the O2/H2O ratio is isotropic in the coma and does not change systematically with heliocentric distance, which suggests that primordial O2 was incorporated into the nucleus during the comet’s formation, which is unexpected given the low upper limits from remote sensing observations.
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The elusive O2H+ has been characterized for the first time by high-resolution rovibrational spectroscopy via its ν1 OH-stretching band and the rotational spectrum is predicted, but not yet detected.
References
SHOWING 1-10 OF 28 REFERENCES
Production of interstellar hydrogen peroxide (H2O2) on the surface of dust grains
- Geology, Physics
- 2012
Context. The formation of water on the dust grains in the interstellar medium may proceed with hydrogen peroxide (H2O2) as an intermediate. Recently gas-phase H2O2 has been detected in ρ Oph A with…
Deuterated formaldehyde in rho Ophiuchi A
- Physics, Chemistry
- 2010
Context. Formaldehyde is an organic molecule that is abundant in the interstellar medium. High deuterium fractionation is a common feature in low-mass star-forming regions. Observing several…
Water formation at low temperatures by surface O2 hydrogenation II: The reaction network.
- PhysicsPhysical chemistry chemical physics : PCCP
- 2010
The full reaction scheme for O(2) surface hydrogenation is derived and several reaction steps prove to be much more efficient or less efficient than originally thought.
Multi-line detection of O2 toward rho Oph A
- Physics
- 2012
Models of pure gas-phase chemistry in well-shielded regions of molecular clouds predict relatively high levels of molecular oxygen, O2, and water, H2O. Contrary to expectation, the space missions…
Water formation at low temperatures by surface O2 hydrogenation I: Characterization of ice penetration.
- PhysicsPhysical chemistry chemical physics : PCCP
- 2010
It is shown that the proposed O(2) hydrogenation scheme is incomplete, suggesting that additional surface reactions should be considered, and the competition between reaction and diffusion of the H atoms into the O( 2) ice explains the unexpected H(2).
FORMATION OF COMPACT AMORPHOUS H2O ICE BY CODEPOSITION OF HYDROGEN ATOMS WITH OXYGEN MOLECULES ON GRAIN SURFACES
- Physics
- 2009
Formation of H2O molecules through the codeposition of oxygen molecules and hydrogen atoms is examined in situ using IR spectroscopy at 10–40 K under various O2 and H fluxes. It is found that H2O and…
Discovery of interstellar CF
- Physics
- 2006
We discuss the first astronomical detection of the CF + (fluoromethylidynium) ion, obtained by observations of the J = 1− 0 (102.6 GHz), J = 2− 1 (205.2 GHz) and J = 3− 2 (307.7 GHz) rotational…
THE COLOGNE DATABASE FOR MOLECULAR SPECTROSCOPY, CDMS
- Physics
- 1997
The unambiguous assignment of atomic or molecular lines in the interstellar or circumstellar medium (ISM or CSM) depends critically on the availability of laboratory data with appropriate accuracy.…
Detection of the Water Reservoir in a Forming Planetary System
- Physics, GeologyScience
- 2011
The Heterodyne Instrument for the Far-Infrared on board the Herschel Space Observatory has detected emission lines from both spin isomers of cold water vapor from the disk around the young star TW Hydrae, hinting at a water ice reservoir equivalent to several thousand Earth oceans in mass.