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J/other/SciA/1.9    C/2014 Q2 (Lovejoy) spectra                 (Biver+, 2015)

Ethyl alcohol and sugar in comet C/2014 Q2 (Lovejoy). Biver N., Bockelee-Morvan D., Moreno R., Crovisier J., Colom P., Lis D.C., Sandqvist Aa., Boissier J., Despois D., Milam S.N. <Science Advances, 1, 9, e1500863 (2015)> =2015SciA....1....9B (SIMBAD/NED BibCode)
ADC_Keywords: Comets ; Radio lines ; Spectra, millimetric/submm Keywords: astrobiology - astrochemistry - comets: general, individual: C/2014 Q2 (Lovejoy) - radio lines: solar system - submillimetre Abstract: The presence of numerous complex organic molecules (COMs; defined as those containing 6 or more atoms) around protostars shows that star formation is accompanied by an increase of molecular complexity. These COMs may be part of the material from which planetesimals and ultimately planets formed. Comets sample some of the oldest and most primitive material in the solar system, including ices, and are thus our best window into the volatile composition of the solar proto-planetary disk. Molecules identified to be present in cometary ices include water, simple hydrocarbons, oxygen, sulfur and nitrogen-bearing species, as well as a few COMs, such as ethylene glycol and glycine. Here, we report the detection of 21 molecules in comet C/2014 Q2 (Lovejoy), including the first identification of ethyl alcohol (ethanol, C2H5OH) and the simplest monosaccharide sugar glycolaldehyde (CH2OHCHO) in a comet. The abundances of ethanol and glycolaldehyde, respectively 5 and 0.8% relative to methanol (0.12 and 0.02% relative to water), are somewhat higher than values measured in solar-type protostars. Overall, the high abundance of COMs in cometary ices supports formation through grain-surface reactions in the solar system protoplanetary disk. Description: Individual, time averaged, spectra of the glycoladehyde and ethanol lines listed in Table S1; Sum spectra (spectra resampled and aligned in the Doppler velocity frame) of the 8 molecules as shown in Fig. 1; Spectra of Fig. S3. The spectrum for isocyanic acid, HNCO is for the single line at 241.774GHz and provides also most of the methanol lines used for the diagram in Fig. S2. One fits file per spectrum, fits output from class ( Objects.dat : -------------------------------------------------------------------------------- Code Name Elem q e i H1 d AU deg mag -------------------------------------------------------------------------------- C/2013 R1 Lovejoy 2456651.5 0.8118182 0.9983297 64.040457 11.66 File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 154 28 List of FITS spectra sp/* 0 28 Individual FITS spectra
See also: J/A+A/564/L2 : CH3OH line parameters in comets ISON & Lovejoy (Agundez+, 2014) J/A+A/566/L5 : C/2012 F6 (Lemmon) & C/2013 R1 spectra (Lovejoy) (Biver+, 2014) Byte-by-byte Description of file: list.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Name Comet name 9- 31 A23 --- Date Observation date (YYYY-MM-DDThh:mm:ss.sss) 33- 36 I4 --- Nx Number of channels 38- 49 E12.6 Hz Df0 Lower value of frequency interval 51- 62 E12.6 Hz Df1 Upper value of frequency interval 63- 72 F10.3 Hz df Frequency resolution 74- 89 E16.10 Hz Freq Rest frequency of the transition 91- 92 I2 Kibyte size [8-11] Size of FITS file 94-105 A12 --- FileName Name of the fits file in subdirectory sp 107-154 A48 --- Title Title of the file
Acknowledgements: Nicolas Biver, Nicolas.Biver(at)
(End) Patricia Vannier [CDS] 15-Oct-2015
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