| Name | OT1_rmoreno_1 |
| Title | Confirmation of the first detection of HNC on Titan |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342237614&instrument_name=HIFI&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-rb4o2cr |
| Author | moreno, r. |
| Description | Observations of Titan were performed on June 14, 2010 with Herschel/HIFI, as part of the Herschel guaranteed time key programme Water and related chemistry in the Solar System (PI: P. Hartogh). These measurements, targetted to the H2O 556.935 GHz line, have shown in addition an unanticipated line at 543.897 GHz. We attribute this emission to HNC(6-5), which would represent the first detection of HNC in Titans atmosphere. Preliminary interpretation of the data suggests that HNC is confined to the upper atmosphere (above at least 300 km, and may be even higher). HNC is a plausible species in Titans atmosphere, expected to be produced by dissociative recombination reaction of the ionospheric ion HCNH+ at altitudes above 1000 km. The loss process considered is HNC protonation by reaction with H-bearing ions and H atoms, yielding HCN. An accurate knowledge of the vertical distribution of HNC and HCN at altitudes above 800 km would provide a major constraint for the photochemical formation scheme of HNC.The goal of this proposal are (i) to spectroscopically confirm the presence of HNC in the upper atmosphere of Titan by observing another transition at 906 GHz (ii) to measure the narrow component of HCN at 532 GHz, in order to retrieve its abundance abundance profile over 400-800 km. The so-constrained HNC/HCN ratio in the upper atmosphere will permit us to discriminate between the different possible formation/loss schemes of HNC. |
| Publication | |
| Instrument | HIFI_HifiPoint_pos |
| Temporal Coverage | 2012-01-18T17:18:10Z/2012-01-19T06:45:47Z |
| Version | SPG v14.1.0 |
| Mission Description | Herschel was launched on 14 May 2009! It is the fourth cornerstone mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities. |
| Creator Contact | https://support.cosmos.esa.int/h®erschel/ |
| Date Published | 2012-07-18T22:10:32Z |
| Last Update | 2026-03-02 |
| Keywords | Herschel Space Observatory data, ESA Herschel mission dataset, far-infrared astronomy observations, submillimeter astronomy data, infrared space telescope observations, PACS photometer data, PACS spectrometer data, SPIRE photometer data, SPIRE Fourier transform spectrometer data, HIFI heterodyne spectroscopy data, far-infrared spectroscopy dataset, submillimeter spectral line observations, cold universe observations dataset, star formation infrared data, molecular cloud far-infrared observations, interstellar medium spectroscopy data, protoplanetary disk infrared observations, galaxy evolution far-infrared data, dust emission submillimeter observations, cosmic infrared background measurements, extragalactic infrared survey data, calibrated level 2 data products, FITS files astronomy, spectral cubes far-infrared, flux-calibrated maps, continuum photometry data, spectral energy distribution measurements, ESA Herschel Science Archive data |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, moreno et al., 2012, 'Confirmation of the first detection of HNC on Titan', SPG v14.1.0, European Space Agency, https://doi.org/10.5270/esa-rb4o2cr |