J/A+A/573/A21 Extinction of Titan haze at 3 micron (Courtin+, 2015)
Three-micron extinction of the Titan haze in the 250-700km altitude range:
Possible evidence of a particle-aging process.
Courtin R., Kim S.J., Bar-Nun A.
<Astron. Astrophys. 573, A21 (2015)>
=2015A&A...573A..21C 2015A&A...573A..21C
ADC_Keywords: Solar system ; Planets ; Extinction
Keywords: planets and satellites: individual: Titan -
techniques: spectroscopic - infrared: planetary systems
Abstract:
The chemical nature of the Titan haze is poorly understood. The
investigation carried out by the Cassini-Huygens suite of instruments
is bringing new insights into this question.
This work aims at deriving the vertical variation of the spectral
structure of the 3.3-3.4um absorption feature of the Titan haze
from Cassini VIMS solar occultation data recorded between 250 and
700km altitude.
Description:
We computed the transmittance of Titan's atmosphere using a
spherical shell model and a radiative transfer code including the
influence of CH4, CH3D, and C2H6, as well as the effects of
absorption and scattering by the haze particles. We derived the haze
extinction from a comparison of the synthetic spectra with the VIMS
solar occultation spectra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
vimsdata.dat 168 771 VIMS transmission spectra of Titan haze (fig1)
models.dat 168 6289 Model transmission spectra (fig1)
fig2.dat 114 49 Haze extinction coefficient spectra (fig2)
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Byte-by-byte Description of file: vimsdata.dat
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Bytes Format Units Label Explanations
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1- 7 F7.4 um lambda [3/3.8] Wavelength λ
8- 14 F7.4 --- t1 [0/1.03] Transmission at altitude z1=258km
15- 21 F7.4 --- t2 [0/1.03] Transmission at altitude z2=272km
22- 28 F7.4 --- t3 [0/1.03] Transmission at altitude z3=286km
29- 35 F7.4 --- t4 [0/1.03] Transmission at altitude z4=315km
36- 42 F7.4 --- t5 [0/1.03] Transmission at altitude z5=345km
43- 49 F7.4 --- t6 [0/1.03] Transmission at altitude z6=390km
50- 56 F7.4 --- t7 [0/1.03] Transmission at altitude z7=422km
57- 63 F7.4 --- t8 [0/1.03] Transmission at altitude z8=437km
64- 70 F7.4 --- t9 [0/1.03] Transmission at altitude z9=453km
71- 77 F7.4 --- t10 [0/1.03] Transmission at altitude z10=469km
78- 84 F7.4 --- t11 [0/1.03] Transmission at altitude z11=486km
85- 91 F7.4 --- t12 [0/1.03] Transmission at altitude z12=502km
92- 98 F7.4 --- t13 [0/1.03] Transmission at altitude z13=518km
99-105 F7.4 --- t14 [0/1.03] Transmission at altitude z14=535km
106-112 F7.4 --- t15 [0/1.03] Transmission at altitude z15=552km
113-119 F7.4 --- t16 [0/1.03] Transmission at altitude z16=569km
120-126 F7.4 --- t17 [0/1.03] Transmission at altitude z17=586km
127-133 F7.4 --- t18 [0/1.03] Transmission at altitude z18=603km
134-140 F7.4 --- t19 [0/1.03] Transmission at altitude z19=620km
141-147 F7.4 --- t20 [0/1.03] Transmission at altitude z20=637km
148-154 F7.4 --- t21 [0/1.03] Transmission at altitude z21=655km
155-161 F7.4 --- t22 [0/1.03] Transmission at altitude z22=672km
162-168 F7.4 --- t23 [0/1.03] Transmission at altitude z23=690km
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Byte-by-byte Description of file: models.dat
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Bytes Format Units Label Explanations
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1- 7 F7.4 um lambda [3/3.8] Wavelength λ
8- 14 F7.4 --- t1 [0/1] Modeled transmission at altitude z1=258km
15- 21 F7.4 --- t2 [0/1] Modeled transmission at altitude z2=272km
22- 28 F7.4 --- t3 [0/1] Modeled transmission at altitude z3=286km
29- 35 F7.4 --- t4 [0/1] Modeled transmission at altitude z4=315km
36- 42 F7.4 --- t5 [0/1] Modeled transmission at altitude z5=345km
43- 49 F7.4 --- t6 [0/1] Modeled transmission at altitude z6=390km
50- 56 F7.4 --- t7 [0/1] Modeled transmission at altitude z7=422km
57- 63 F7.4 --- t8 [0/1] Modeled transmission at altitude z8=437km
64- 70 F7.4 --- t9 [0/1] Modeled transmission at altitude z9=453km
71- 77 F7.4 --- t10 [0/1] Modeled transmission at altitude z10=469km
78- 84 F7.4 --- t11 [0/1] Modeled transmission at altitude z11=486km
85- 91 F7.4 --- t12 [0/1] Modeled transmission at altitude z12=502km
92- 98 F7.4 --- t13 [0/1] Modeled transmission at altitude z13=518km
99-105 F7.4 --- t14 [0/1] Modeled transmission at altitude z14=535km
106-112 F7.4 --- t15 [0/1] Modeled transmission at altitude z15=552km
113-119 F7.4 --- t16 [0/1] Modeled transmission at altitude z16=569km
120-126 F7.4 --- t17 [0/1] Modeled transmission at altitude z17=586km
127-133 F7.4 --- t18 [0/1] Modeled transmission at altitude z18=603km
134-140 F7.4 --- t19 [0/1] Modeled transmission at altitude z19=620km
141-147 F7.4 --- t20 [0/1] Modeled transmission at altitude z20=637km
148-154 F7.4 --- t21 [0/1] Modeled transmission at altitude z21=655km
155-161 F7.4 --- t22 [0/1] Modeled transmission at altitude z22=672km
162-168 F7.4 --- t23 [0/1] Modeled transmission at altitude z23=690km
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Byte-by-byte Description of file: fig2.dat
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Bytes Format Units Label Explanations
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1- 6 F6.4 um lambda [3/3.8] Wavelength λ
8- 16 E9.3 km-1 k1 Extinction coefficient at altitude z1=258km
17- 25 E9.3 km-1 k3 Extinction coefficient at altitude z3=286km
26- 34 E9.3 km-1 k5 Extinction coefficient at altitude z5=345km
35- 43 E9.3 km-1 k7 Extinction coefficient at altitude z7=422km
44- 52 E9.3 km-1 k9 Extinction coefficient at altitude z9=453km
53- 61 E9.3 km-1 k11 Extinction coefficient at altitude z11=486km
62- 70 E9.3 km-1 k13 Extinction coefficient at altitude z13=518km
71- 79 E9.3 km-1 k15 Extinction coefficient at altitude z15=552km
80- 88 E9.3 km-1 k17 Extinction coefficient at altitude z17=586km
89- 97 E9.3 km-1 k19 Extinction coefficient at altitude z19=620km
98-106 E9.3 km-1 k21 Extinction coefficient at altitude z21=655km
107-114 E8.3 km-1 k23 Extinction coefficient at altitude z23=690km
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Acknowledgements:
Regis Courtin, regis.courtin(at)obspm.fr
(End) Regis Courtin [LESIA - Obs. Paris], Patricia Vannier [CDS] 05-Nov-2014