Matches in SemOpenAlex for { <https://semopenalex.org/work/W1968998429> ?p ?o ?g. }
- W1968998429 abstract "Aims. Our aim is to determine the critical parameters in water chemistry and the contribution of water to the oxygen budget by observing and modelling water gas and ice for a sample of eleven low-mass protostars, for which both forms of water have been observed.Methods. A simplified chemistry network, which is benchmarked against more sophisticated chemical networks, is developed that includes the necessary ingredients to determine the water vapour and ice abundance profiles in the cold, outer envelope in which the temperature increases towards the protostar. Comparing the results from this chemical network to observations of water emission lines and previously published water ice column densities, allows us to probe the influence of various agents (e.g., far-ultraviolet (FUV) field, initial abundances, timescales, and kinematics).Results. The observed water ice abundances with respect to hydrogen nuclei in our sample are 30–80 ppm, and therefore contain only 10–30% of the volatile oxygen budget of 320 ppm. The keys to reproduce this result are a low initial water ice abundance after the pre-collapse phase together with the fact that atomic oxygen cannot freeze-out and form water ice in regions with T dust ≳ 15 K. This requires short prestellar core lifetimes ≲0.1 Myr. The water vapour profile is shaped through the interplay of FUV photodesorption, photodissociation, and freeze-out. The water vapour line profiles are an invaluable tracer for the FUV photon flux and envelope kinematics.Conclusions. The finding that only a fraction of the oxygen budget is locked in water ice can be explained either by a short pre-collapse time of ≲0.1 Myr at densities of n H ~ 104 cm-3 , or by some other process that resets the initial water ice abundance for the post-collapse phase. A key for the understanding of the water ice abundance is the binding energy of atomic oxygen on ice." @default.
- W1968998429 created "2016-06-24" @default.
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- W1968998429 date "2014-12-01" @default.
- W1968998429 modified "2023-09-26" @default.
- W1968998429 title "Water in low-mass star-forming regions with Herschel - The link between water gas and ice in protostellar envelopes" @default.
- W1968998429 cites W1602634446 @default.
- W1968998429 cites W1967340141 @default.
- W1968998429 cites W1968850479 @default.
- W1968998429 cites W1972568324 @default.
- W1968998429 cites W1976280860 @default.
- W1968998429 cites W1979340021 @default.
- W1968998429 cites W1982716624 @default.
- W1968998429 cites W1983532783 @default.
- W1968998429 cites W1985462719 @default.
- W1968998429 cites W1987546210 @default.
- W1968998429 cites W1990776584 @default.
- W1968998429 cites W1998408542 @default.
- W1968998429 cites W1999260198 @default.
- W1968998429 cites W1999352618 @default.
- W1968998429 cites W2004266795 @default.
- W1968998429 cites W2011301426 @default.
- W1968998429 cites W2012531773 @default.
- W1968998429 cites W2013375339 @default.
- W1968998429 cites W2014771079 @default.
- W1968998429 cites W2016500630 @default.
- W1968998429 cites W2018294124 @default.
- W1968998429 cites W2019579421 @default.
- W1968998429 cites W2024389974 @default.
- W1968998429 cites W2027278985 @default.
- W1968998429 cites W2028252412 @default.
- W1968998429 cites W2028938532 @default.
- W1968998429 cites W2038084437 @default.
- W1968998429 cites W2040511327 @default.
- W1968998429 cites W2041493420 @default.
- W1968998429 cites W2043386810 @default.
- W1968998429 cites W2045657296 @default.
- W1968998429 cites W2047978696 @default.
- W1968998429 cites W2049005368 @default.
- W1968998429 cites W2050474352 @default.
- W1968998429 cites W2052303152 @default.
- W1968998429 cites W2055147184 @default.
- W1968998429 cites W2057973863 @default.
- W1968998429 cites W2058921445 @default.
- W1968998429 cites W2060661779 @default.
- W1968998429 cites W2072682516 @default.
- W1968998429 cites W2078495797 @default.
- W1968998429 cites W2079412086 @default.
- W1968998429 cites W2081670553 @default.
- W1968998429 cites W2083679708 @default.
- W1968998429 cites W2092615110 @default.
- W1968998429 cites W2093605424 @default.
- W1968998429 cites W2101084302 @default.
- W1968998429 cites W2102403192 @default.
- W1968998429 cites W2104604189 @default.
- W1968998429 cites W2108502952 @default.
- W1968998429 cites W2111573944 @default.
- W1968998429 cites W2112309441 @default.
- W1968998429 cites W2125144908 @default.
- W1968998429 cites W2126700402 @default.
- W1968998429 cites W2127675995 @default.
- W1968998429 cites W2129165978 @default.
- W1968998429 cites W2129395676 @default.
- W1968998429 cites W2130265299 @default.
- W1968998429 cites W2131287406 @default.
- W1968998429 cites W2131345495 @default.
- W1968998429 cites W2131938748 @default.
- W1968998429 cites W2133991519 @default.
- W1968998429 cites W2135394641 @default.
- W1968998429 cites W2135625048 @default.
- W1968998429 cites W2146411165 @default.
- W1968998429 cites W2146581497 @default.
- W1968998429 cites W2150900999 @default.
- W1968998429 cites W2155969501 @default.
- W1968998429 cites W2158740307 @default.
- W1968998429 cites W2163097250 @default.
- W1968998429 cites W2165964407 @default.
- W1968998429 cites W2166886821 @default.
- W1968998429 cites W2170249007 @default.
- W1968998429 cites W2172028936 @default.
- W1968998429 cites W2785978357 @default.
- W1968998429 cites W3099508568 @default.
- W1968998429 cites W3101068406 @default.
- W1968998429 cites W3102692320 @default.
- W1968998429 cites W3103691168 @default.
- W1968998429 cites W3103695928 @default.
- W1968998429 cites W3104225280 @default.
- W1968998429 cites W3105430319 @default.
- W1968998429 cites W3121358514 @default.
- W1968998429 cites W3122913394 @default.
- W1968998429 hasPublicationYear "2014" @default.
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