2018AJ....156...68F

Query : 2018AJ....156...68F

2018AJ....156...68F - Astron. J., 156, 68-68 (2018/August-0)

The volatile composition of comet C/2017 E4 (Lovejoy) before its disruption, as revealed by high-resolution infrared spectroscopy with iSHELL at the NASA/IRTF.

FAGGI S., VILLANUEVA G.L., MUMMA M.J. and PAGANINI L.

Abstract (from CDS):

In 2017 April, we acquired comprehensive high-resolution spectra of newly discovered comet C/2017 E4 (Lovejoy) as it approached perihelion, and before its disintegration. We detected many cometary emission lines in the range (2.8-5.3) µm, in four customized instrument settings (L1-c, L3, Lp1-c, and M1) of iSHELL-the new near-IR high-resolution immersion echelle spectrograph at NASA/IRTF (Maunakea, Hawaii). We identified 12 molecular species: nine primary volatiles (H2O, HCN, NH3, CO, C2H2, C2H6, CH4, CH3OH, H2CO) and three product species (CN, NH2, OH). We detected 85 H2O emission lines from 12 water vibrational bands across L1-c and M1 settings. The many detected water emission lines enabled retrieval of accurate measures for ortho- and para-H2O independently, thereby reducing systematic uncertainty in the derived ortho-para ratio and nuclear spin temperature. Excitation analyses and emission profile analyses were performed for all species, and molecular abundance ratios relative to water are compared with values found for other Oort Cloud comets in our infrared database. Abundance ratios are consistent for most species, with the exception of underabundant methanol and overabundant ammonia in E4.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrobiology - comets: individual: (C,2017 E4 (Lovejoy)) - infrared: general - molecular data - planetary systems - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/AJ/156/68): table3.dat table4.dat>

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 - 2026 		#notes
1 * alf Cyg sg* 20 41 25.91514 +45 16 49.2197 1.11 1.34 1.25 1.14 1.04 A2Ia 778 0

Query : 2018AJ....156...68F

Basic data :
* alf Cyg -- Evolved Supergiant
Other object types: otypes_help 		* (*,AG,...), ** (ADS,CCDM,...), Em* (EM*,[KW97]), UV (CEL,TD1), IR (IRC,RAFGL), sg* (1943MKAtl), Pu* (2009yCat), V* (V*), NIR (2MASS)
ICRS coord. (ep=J2000) : 		20 41 25.91514 +45 16 49.2197 (Optical) [ 2.99 2.38 90 ] A 2007A&A...474..653V
FK4 coord. (ep=B1950 eq=1950) : 		20 39 43.53618 +45 06 03.0639 [ 2.99 2.38 90 ]
Gal coord. (ep=J2000) : 		084.28473664 +01.99754611 [ 2.99 2.38 90 ]
Proper motions mas/yr : 		2.01 1.85 [0.34 0.27 0] A 2007A&A...474..653V
Radial velocity / Redshift / cz : 		V(km/s) -4.90 [0.3] / z(~) -0.000016 [0.000001] / cz -4.90 [0.30]
   A 2006AstL...32..759G
Parallaxes (mas): 		2.31 [0.32] A 2007A&A...474..653V
Spectral type: 		A2Ia C 2024A&A...690A.176N
Fluxes (8) :
U 1.11 [~] C 2002yCat.2237....0D
B 1.34 [~] C 2002yCat.2237....0D
V 1.25 [~] C 2002yCat.2237....0D
R 1.14 [~] C 2002yCat.2237....0D
I 1.04 [~] C 2002yCat.2237....0D
J 0.95 [~] C 2002yCat.2237....0D
H 0.87 [~] C 2002yCat.2237....0D
K 0.88 [~] C 2002yCat.2237....0D
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Identifiers (47) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

* alf Cyg GCRV 12971 MCW 940 TD1 27159
* 50 Cyg GEN# +1.00197345 N30 4579 TIC 195554360
ADS 14172 A GSC 03574-03347 NAME Deneb TYC 3574-3347-1
AG+45 1730 HD 197345 PLX 4935 UBV 17953
ALS 11488 HIC 102098 PLX 4935.00 UBV M 25099
BD+44 3541 HIP 102098 PMC 90-93 546 uvby98 100197345
CCDM J20415+4517A HR 7924 PPM 60323 V* alf Cyg
CEL 5144 IDS 20380+4455 A RAFGL 2633 WDS J20414+4517A
CSI+44 3541 1 IRC +50337 ROT 3019 WEB 18466
EM* MWC 351 JP11 3264 SAO 49941 [HFE83] 1387
FK5 777 LS III +45 15 SKY# 39204 [KW97] 48-33
GC 28846 2MASS J20412592+4516491 SV* ZI 1938

References (778 between 1850 and 2026) (Total 778)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 18    Rot : 7    Fe/H : 8    Plx : 2    PM : 4    SpT : 25   

   

Observing logs
ISO : 23    IUE : 40   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Link by name to the catalogue in VizieR :

AG+45 1730 ALS 11488 BD+44 3541 CCDM J20415+4517A CEL 5144
FK5 777 GSC 03574-03347 HD 197345 HIC 102098 HIP 102098
HR 7924 IRC +50337 LS III +45 15 2MASS J20412592+4516491 PLX 4935
PPM 60323 RAFGL 2633 SAO 49941 TD1 27159 TYC 3574-3347-1
uvby98 100197345 V* alf Cyg WDS J20414+4517A

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