2018MNRAS.474.3714M

Query : 2018MNRAS.474.3714M

2018MNRAS.474.3714M - Mon. Not. R. Astron. Soc., 474, 3714-3719 (2018/March-1)

The quest for H_3^+ at Neptune: deep burn observations with NASA IRTF iSHELL.

MELIN H., FLETCHER L.N., STALLARD T.S., JOHNSON R.E., O'DONOGHUE J., MOORE L. and DONNELLY P.T.

Abstract (from CDS):

Emission from the molecular ion H_3^+ is a powerful diagnostic of the upper atmosphere of Jupiter, Saturn, and Uranus, but it remains undetected at Neptune. In search of this emission, we present near-infrared spectral observations of Neptune between 3.93 and 4.00 µm taken with the newly commissioned iSHELL instrument on the NASA Infrared Telescope Facility in Hawaii, obtained 2017 August 17-20. We spent 15.4 h integrating across the disc of the planet, yet were unable to unambiguously identify any H_3^+ line emissions. Assuming a temperature of 550 K, we derive an upper limit on the column integrated density of 1.0+1.2–0.8×1013 m–2, which is an improvement of 30 per cent on the best previous observational constraint. This result means that models are overestimating the density by at least a factor of 5, highlighting the need for renewed modelling efforts. A potential solution is strong vertical mixing of polyatomic neutral species from Neptune's upper stratosphere to the thermosphere, reacting with H_3^+, thus greatly reducing the column integrated H_3^+ densities. This upper limit also provide constraints on future attempts at detecting H_3^+ using the James Webb Space Telescope.

Abstract Copyright: © The Author(s) 2017. Published by Oxford University Press on behalf of The Royal Astronomical Society.

Journal keyword(s): techniques: spectroscopic - planets and satellites: atmospheres - planets and satellites: aurorae - planets and satellites: composition - planets and satellites: individual: Neptune - planets and satellites: individual: Uranus

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 V* VZ Ari a2* 02 48 45.9032570928 +25 11 16.988042760 5.710 5.850 5.890     A0V 51 0

Query : 2018MNRAS.474.3714M

Basic data :
V* VZ Ari -- alpha2 CVn Variable
Other object types: otypes_help 		a2* (), * (*,AG,...), PM* (2018yCat), V* (V*), UV (TD1), NIR (2MASS)
ICRS coord. (ep=J2000) : 		02 48 45.9032570928 +25 11 16.988042760 (Optical) [ 0.1677 0.1298 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		02 45 51.0778514406 +24 58 50.351644880 [ 0.1677 0.1298 90 ]
Gal coord. (ep=J2000) : 		153.9064614478625 -30.5341786595374 [ 0.1677 0.1298 90 ]
Proper motions mas/yr : 		60.139 -2.475 [0.170 0.155 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 13.8 [2] / z(~) 0.000046 [0.000007] / cz 13.80 [2.00]
   E 1953GCRV..C......0W
Parallaxes (mas): 		6.2922 [0.1856] A 2020yCat.1350....0G
Spectral type: 		A0V C ~
Fluxes (7) :
U 5.710 [0.010] C 1991A&AS...89..415O
B 5.850 [0.007] C 1991A&AS...89..415O
V 5.890 [0.009] C 1991A&AS...89..415O
G 5.883260 [0.002849] C 2020yCat.1350....0G
J 5.892 [0.023] C 2003yCat.2246....0C
H 5.912 [0.018] C 2003yCat.2246....0C
K 5.909 [0.018] C 2003yCat.2246....0C
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Identifiers (28) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

* 16 Tri HD 17471 SAO 75588 uvby98 100017471
AG+24 241 HIC 13121 SKY# 4219 V* VZ Ari
BD+24 396 HIP 13121 TD1 1679 WEB 2643
GC 3373 HR 830 TIC 436868126 YPAC 303
GCRV 1579 2MASS J02484589+2511170 TYC 1785-603-1 YZ 24 838
GEN# +1.00017471 PPM 91996 UBV 2747 Gaia DR2 114312345585489792
GSC 01785-00603 Renson 4380 UBV M 9161 Gaia DR3 114312345585489792

References (51 between 1850 and 2026) (Total 51)
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 : 4    Distance : 2    Rot : 7    Fe/H : 2    Plx : 4    PM : 4    SpT : 3   

   

External archives :

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

Link by name to the catalogue in VizieR :

AG+24 241 BD+24 396 GSC 01785-00603 HD 17471 HIC 13121
HIP 13121 HR 830 2MASS J02484589+2511170 PPM 91996 SAO 75588
TD1 1679 TYC 1785-603-1 uvby98 100017471 V* VZ Ari Gaia DR2 114312345585489792
Gaia DR3 114312345585489792

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