2018A&A...611A..35T


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET10:15:41

2018A&A...611A..35T - Astronomy and Astrophysics, volume 611A, 35-35 (2018/3-1)

Infrared spectra of complex organic molecules in astronomically relevant ice matrices. I. Acetaldehyde, ethanol, and dimethyl ether.

TERWISSCHA VAN SCHELTINGA J., LIGTERINK N.F.W., BOOGERT A.C.A., VAN DISHOECK E.F. and LINNARTZ H.

Abstract (from CDS):


Context. The number of identified complex organic molecules (COMs) in inter- and circumstellar gas-phase environments is steadily increasing. Recent laboratory studies show that many such species form on icy dust grains. At present only smaller molecular species have been directly identified in space in the solid state. Accurate spectroscopic laboratory data of frozen COMs, embedded in ice matrices containing ingredients related to their formation scheme, are still largely lacking. Aim. This work provides infrared reference spectra of acetaldehyde (CH3CHO), ethanol (CH3CH2OH), and dimethyl ether (CH3OCH3) recorded in a variety of ice environments and for astronomically relevant temperatures, as needed to guide or interpret astronomical observations, specifically for upcoming James Webb Space Telescope observations.
Methods. Fourier transform transmission spectroscopy (500-4000cm–1/20-2.5µm, 1.0cm–1 resolution) was used to investigate solid acetaldehyde, ethanol and dimethyl ether, pure or mixed with water, CO, methanol, or CO:methanol. These species were deposited on a cryogenically cooled infrared transmissive window at 15K. A heating ramp was applied, during which IR spectra were recorded until all ice constituents were thermally desorbed.
Results. We present a large number of reference spectra that can be compared with astronomical data. Accurate band positions and band widths are provided for the studied ice mixtures and temperatures. Special efforts have been put into those bands of each molecule that are best suited for identification. For acetaldehyde the 7.427 and 5.803µm bands are recommended, for ethanol the 11.36 and 7.240µm bands are good candidates, and for dimethyl ether bands at 9.141 and 8.011µm can be used. All spectra are publicly available in the Leiden Database for Ice.

Abstract Copyright: © ESO 2018

Journal keyword(s): astrochemistry - methods: laboratory: molecular - techniques: spectroscopic - molecular processes

Simbad objects: 1

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Number of rows : 1

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 W 33a Y*O 18 14 39.0 -17 52 03           ~ 589 0

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET10:15:41

Available data : Basic data  •  Identifiers  •  Plot & images  •  Bibliography  •  Measurements  •  External archives  •  Notes  •  Annotations


Basic data :
W 33a -- Young Stellar Object
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
HII (1996A&AS,[BNM96],...), Rad (GRS,Kes,...), IR (IRAS,MSX6C,...), Y*O (2015MNRAS), out (2015MNRAS), Mas (2011MNRAS)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
18 14 39.0 -17 52 03 [ ] D 2004ApJS..154..553S
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
18 11 43.7 -17 53 01 [ ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
012.9069 -00.2589 [ ]
Velocity of Local System : VSLR Vmin Vmax [error] (wavelength) bibcode
VLSR :
36.6 32.3 40.9 [0.13] (Rad) 1996A&AS..115...81B
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Identifiers (11) :
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GAL 012.91-00.26 Kes 64 RAFGL 2090 [WBH98] 18117-1753
GRS G012.90 -00.30 MSH 18-1-04 W 33a [WHR97] 18117-1753
IRAS 18117-1753 MSX6C G012.9090-00.2607 [BNM96] 012.907-0.259

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References (589 between 1850 and 2021) (Total 589)
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Observing logs


ISO : 14    herschel : 156   

   


External archives :

Data at NED - NASA/IPAC Extragalactic Database : W 33a

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IRAS 18117-1753 MSX6C G012.9090-00.2607 RAFGL 2090

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2020.11.25-10:15:41

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