%0 Journal Article
%T Abundance of HOCO+ and CO2 in the outer layers of the L1544 prestellar core
%+ Institut de recherche en astrophysique et planétologie (IRAP)
%+ Institut de Planétologie et d'Astrophysique de Grenoble (IPAG)
%A Vastel, C.
%A Ceccarelli, C.
%A Lefloch, B.
%A Bachiller, R.
%< avec comité de lecture
%@ 0004-6361
%J Astronomy and Astrophysics - A&A
%I EDP Sciences
%V 591
%8 2016
%D 2016
%Z 1605.08318
%Z 2016A&A...591L...2V
%R 10.1051/0004-6361/201628427
%K astrochemistry
%K line: identification
%K molecular data
%K radiative transfer
%Z Sciences of the Universe [physics]
%Z Sciences of the Universe [physics]/Astrophysics [astro-ph]Journal articles
%X The L1544 prestellar core has been observed as part of the ASAI IRAM Large Program at 3 mm. These observations led to the detection of many complex molecules. In this Letter, we report the detection of two lines, at 85.5 GHz (40,4-30,3) and 106.9 GHz (50,5-40,4), respectively, of the protonated carbon dioxide ion, HOCO+. We also report the tentative detection of the line at 100.4 GHz (50,5-40,4) of DOCO+. The non-LTE analysis of the detected lines shows that the HOCO+ emission originates in the external layer where non-thermal desorption of other species has previously been observed. Its abundance is (5 ± 2) × 10-11. Modelling of the chemistry involved in the formation and destruction of HOCO+ provides a gaseous CO2 abundance of 2 × 10-7 (with respect to H2) with an upper limit of 2 × 10-6.
%G English
%2 https://insu.hal.science/insu-03670227/document
%2 https://insu.hal.science/insu-03670227/file/aa28427-16.pdf
%L insu-03670227
%U https://insu.hal.science/insu-03670227
%~ IRD
%~ INSU
%~ METEO
%~ UNIV-SAVOIE
%~ UNIV-TLSE3
%~ UGA
%~ CNRS
%~ INPG
%~ IRSTEA
%~ CNES
%~ OSUG
%~ OMP
%~ OMP-IRAP
%~ IPAG
%~ AGREENIUM
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%~ UGA-COMUE
%~ USMB-COMUE
%~ UNIV-UT3
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%~ TEST3-HALCNRS