J/A+A/648/A49 Comet 46P/Wirtanen millimetre-wave spectra (Biver+, 2021)
Molecular composition of comet 46P/Wirtanen from millimetre-wave spectroscopy.
Biver N., Bockelee-Morvan D., Boissier J., Moreno R., Crovisier J.,
Lis D.C., Colom P., Cordiner M., Milam S., Roth N.X., Bonev B.P.,
Dello Russo N., Vervack R.J.Jr, DiSanti M.A.
<Astron. Astrophys. 648, A49 (2021)>
=2021A&A...648A..49B 2021A&A...648A..49B (SIMBAD/NED BibCode)
ADC_Keywords: Solar system ; Comets ; Radio lines ; Spectra, millimetric/submm
Keywords: comets: general, individual: 46P/Wirtanen -
radio lines: planetary system - submillimeter: planetary system
Abstract:
We present the results of a molecular survey of comet 46P/Wirtanen
undertaken with the IRAM 30-m and NOEMA radio telescopes in December
2018. Observations at IRAM 30-m during the 12-18 Dec. period comprise
a 2mm spectral survey, which covers 25GHz, and a 1mm survey which
covers 62GHz.
The gas outflow velocity and kinetic temperature have been accurately
constrained by the observations. We derive abundances of 11 molecules,
some being identified remotely for the first time in a Jupiter-family
comet, including complex organic molecules such as formamide, ethylene
glycol, acetaldehyde or ethanol. Sensitive upper limits on the
abundances of 24 other molecules are obtained.
The comet is found to be relatively rich in methanol (3.4% relative to
water) but relatively depleted in CO, CS, HNC, HNCO or HCOOH.
Description:
Individual, time averaged, IRAM 30m telescope spectra as presented in
Figs. 2, 3, 4, 5, 13 and wide band spectra of Figs. B.1 and C.1. One
fits file per spectrum, fits output from class.
(http://www.iram.fr/IRAMFR/GILDAS/).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 149 30 List of fits spectra
fits/* . 30 Individual fits spectra
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 25 I6 --- Nx Number of pixels along X-axis
27- 49 A23 "datime" Obs.date Observation date
51- 62 E12.6 Hz bFREQ Lower value of frequency interval
64- 74 E11.6 Hz BFREQ Upper value of frequency interval
76- 83 F8.1 Hz dFREQ Frequency resolution
85- 88 I4 Kibyte size Size of FITS file
90-101 A12 --- FileName Name of FITS file, in subdirectory fits
103-149 A47 --- Title Title of the FITS file
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Acknowledgements:
Nicolas Biver, nicolas.biver(at)obspm.fr
(End) Patricia Vannier [CDS] 19-Feb-2021