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Abundance of HOCO+ and CO2 in the outer layers of the L1544 prestellar core

Abstract : 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.
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C. Vastel, C. Ceccarelli, B. Lefloch, R. Bachiller. Abundance of HOCO+ and CO2 in the outer layers of the L1544 prestellar core. Astronomy & Astrophysics, 2016, 591, ⟨10.1051/0004-6361/201628427⟩. ⟨insu-03670227⟩

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