Updated Radiative Transfer Model for Titan in the Near-infrared Wavelength Range: Validation against Huygens Atmospheric and Surface Measurements and Application to the Cassini/VIMS Observations of the Dragonfly Landing Area

被引：2

作者：

Es-sayeh, M. ^{[1
]}

Rodriguez, S. ^{[1
]}

Coutelier, M. ^{[2
]}

Rannou, P. ^{[3
]}

Bezard, B. ^{[4
]}

Maltagliati, L. ^{[5
]}

Cornet, T. ^{[6
]}

Grieger, B. ^{[6
]}

Karkoschka, E. ^{[7
]}

Le Mouelic, S. ^{[8
]}

Le Gall, A. ^{[9
]}

Neish, C. ^{[10
]}

MacKenzie, S. ^{[11
]}

Solomonidou, A. ^{[12
]}

Sotin, C. ^{[8
]}

Coustenis, A. ^{[4
]}

机构：

[1] Univ Paris Cite, IPGP, CNRS, Paris, France

[2] Sorbonne Univ, UVSQ Univ Paris Saclay, LATMOS, IPSL,CNRS, Guyancourt, France

[3] Univ Reims, Grp Spectrometrie Mol & Atmospher, UMR CNRS 7331, Reims, France

[4] Univ Paris Cite, Univ PSL, Sorbonne Univ, LESIA,CNRS,Observ Paris, 5 Pl Jules Janssen, F-92195 Meudon, France

[5] Springer Nat, Nat Astron, 4 Crinan St, London N1 9XW, England

[6] ESAC, Aurora Technol BV ESA European Space Agcy, Camino Bajo Castillo S-N,Urb Villafranca Castillo, E-28692 Madrid, Spain

[7] Lunar & Planetary Lab, 1629 E Univ Blvd, Tucson, AZ 85721 USA

[8] Univ Mans, Nantes Univ, Univ Angers, Lab Planetol & Geosci,CNRS UMR 6112, Nantes, France

[9] IUF, Lab Atmospheres Milieux Observat Spatiales LATMOS, UVSQ, CNRS,Paris 6,UMR 8190, F-78280 Paris, France

[10] Univ Western Ontario, Dept Earth Sci, London, ON N6A 5B7, Canada

[11] Johns Hopkins Univ Appl Phys Lab, 11100 Johns Hopkins Rd, Laurel, MD 20723 USA

[12] Hellen Space Ctr, Athens, Greece

来源：

PLANETARY SCIENCE JOURNAL | 2023年 / 4卷 / 03期

关键词：

MU-M REGION; ISOTOPIC-RATIOS; RAYLEIGH-SCATTERING; SPECTRAL PROPERTIES; SELK CRATER; METHANE; AEROSOLS; STRATOSPHERE; CO; EVOLUTION;

D O I：

10.3847/PSJ/acbd37

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present an analysis of Titan data acquired by the Cassini Visual and Infrared Mapping Spectrometer (VIMS) at the landing site of the Dragonfly mission, using a new version of our radiative transfer model for Titan, with significant updates for the spectroscopic parameters of atmospheric gases and photochemical aerosols. Our updated radiative transfer model is validated against the in situ spectroscopic measurements of the Huygens probe during its descent and once landed. We confirm that aerosols with a fractal dimension of 2.3-2.4 provide the best fit to the observations. We apply our radiative transfer model to four VIMS data cubes over the Selk crater region including the Dragonfly landing and exploration areas, further validating our model by producing consistent aerosol population and surface albedo maps. These infrared albedo maps, further corrected from the photometry, enable us to study the Selk crater region in terms of surface composition, landscape formation, and evolution. Our results suggest that the Selk crater is in an intermediate state of degradation and that the mountainous terrains of the area (including the crater rim and ejecta) are likely to be dominated by fine grains of tholin-like sediment. This organic sediment would be transported to the lowlands (crater floor and surrounding plains), possibly with water ice particles, by rivers, and further deposited and processed to form the sand particles that feed the neighboring dune fields. These results provide information for the operational and scientific preparation of the Dragonfly mission, paving the way for future exploration of Titan's surface composition and geology.

引用

页数：27