Characterizing the chemical pathways for water formation -- A deep search for hydrogen peroxide

Abstract

In 2011, hydrogen peroxide (HOOH) was observed for the first time outside the solar system (Bergman et al., A&A, 2011, 531, L8). This detection appeared a posteriori quite natural, as HOOH is an intermediate product in the formation of water on the surface of dust grains. Following up on this detection, we present 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). We do not detect the molecule in any other source than Oph A, and derive 3$\sigma$ upper limits for the abundance of HOOH relative to H${}_2$ lower than in Oph A for most sources. This result sheds a different light on our understanding of the detection of HOOH in Oph A, and shifts the puzzle to why this source seems to be special. Therefore we rediscuss the detection of HOOH in Oph A, as well as the implications of the low abundance of HOOH, and its similarity with the case of O${}_2$. Our chemical models show that the production of HOOH is extremely sensitive to the temperature, and favored only in the range 20$-$30 K. The relatively high abundance of HOOH observed in Oph A suggests that the bulk of the material lies at a temperature in the range 20$-$30 K.

18 pages, 3 figures, invited refereed paper at the Faraday Discussion 168

References in corpus (12)

• Laboratory evidence for efficient water formation in interstellar ices
• First detection of water vapor in a pre-stellar core
• Formation of hydrogen peroxide and water from the reaction of cold hydrogen atoms with solid oxygen at 10K
• Molecular oxygen in the rho Ophiuchi cloud
• Detection of interstellar hydrogen peroxide
• A SCUBA imaging survey of ultracompact HII regions: The environments of massive star formation
• Probing the initial conditions of High Mass Star formation -- I. Deuteration and depletion in high mass pre/protocluster clumps
• Deep observations of O2 toward a low-mass protostar with Herschel-HIFI
• Detection of the hydroperoxyl radical HO2 toward ρOph A: Additional constraints on the water chemical network
• Hot ammonia in NGC6334I & I(N)
• Strong irradiation of protostellar cores in Corona Australis
• Low-mass star formation in R Coronae Australis: Observations of organic molecules with the APEX telescope

Cited by in corpus (4)

• Quantum tunneling during interstellar surface-catalyzed formation of water: the reaction H + H${}_2$O${}_2$ $\to$ H${}_2$O + OH
• Influence of surface and bulk water ice on the reactivity of a water-forming reaction
• Search for HOOH in Orion
• Deep search for hydrogen peroxide toward pre- and protostellar objects -- Testing the pathway of grain surface water formation