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Cassini RADAR Images at Hotei Arcus and Western Xanadu, Titan: Evidence for Geologically Recent Cryovolcanic Activity S
GEOPHYSICAL RESEARCH LETTERS, VOL. 36, L04203, doi:10.1029/2008GL036415, 2009 Click Here for Full Article Cassini RADAR images at Hotei Arcus and western Xanadu, Titan: Evidence for geologically recent cryovolcanic activity S. D. Wall,1 R. M. Lopes,1 E. R. Stofan,2 C. A. Wood,3 J. L. Radebaugh,4 S. M. Ho¨rst,5 B. W. Stiles,1 R. M. Nelson,1 L. W. Kamp,1 M. A. Janssen,1 R. D. Lorenz,6 J. I. Lunine,5 T. G. Farr,1 G. Mitri,1 P. Paillou,7 F. Paganelli,2 and K. L. Mitchell1 Received 21 October 2008; revised 5 January 2009; accepted 8 January 2009; published 24 February 2009. [1] Images obtained by the Cassini Titan Radar Mapper retention age comparable with Earth or Venus (500 Myr) (RADAR) reveal lobate, flowlike features in the Hotei [Lorenz et al., 2007]). Arcus region that embay and cover surrounding terrains and [4] Most putative cryovolcanic features are located at mid channels. We conclude that they are cryovolcanic lava flows to high northern latitudes [Elachi et al., 2005; Lopes et al., younger than surrounding terrain, although we cannot reject 2007]. They are characterized by lobate boundaries and the sedimentary alternative. Their appearance is grossly relatively uniform radar properties, with flow features similar to another region in western Xanadu and unlike most brighter than their surroundings. Cryovolcanic flows are of the other volcanic regions on Titan. Both regions quite limited in area compared to the more extensive dune correspond to those identified by Cassini’s Visual and fields [Radebaugh et al., 2008] or lakes [Hayes et al., Infrared Mapping Spectrometer (VIMS) as having variable 2008]. -
A 5-Micron-Bright Spot on Titan: Evidence for Surface Diversity
R EPORTS coated SiN lines corresponds to voids at SiN- surface imaging in physical sciences, engi- 19. R. E. Geer, O. V. Kolosov, G. A. D. Briggs, G. S. polymer interfaces (i.e., voiding underneath the neered systems, and biology. Shekhawat, J. Appl. Phys. 91, 4549 (2002). 20. O. Kolosov, R. M. Castell, C. D. Marsh, G. A. D. Briggs, contact). The contrast is due to the distinct Phys. Rev. Lett. 81, 1046 (1998). viscoelastic response from the specimen acous- References and Notes 21. D. C. Hurley, K. Shen, N. M. Jennett, J. A. Turner, J. tic wave from the voids. Interestingly, a notable 1. H. N. Lin, Appl. Phys. Lett. 74, 2785 (1999). Appl. Phys. 94, 2347 (2003). 2. M. R. VanLandingham et al., in Interfacial Engineering 22. O. Hirotsugu, T. Jiayong, T. Toyokazu, H. Masahiko, hardening of the polymer in the trench and its for Optimized Properties,C.L.Briant,C.B.Carter, Appl. Phys. Lett. 83, 464 (2003). sidewall is also evident in the phase image, E. L. Hall, Eds., vol. 458 of Materials Research Society 23. L. Muthuswami, R. E. Geer, Appl. Phys. Lett. 84, 5082 which results from thermal annealing and pos- Proceedings (Materials Research Society, Pittsburgh, (2004). PA, 1997), pp. 313–318. 24. M. T. Cuberes, H. E. Assender, G. A. D. Briggs, O. V. sibly poor adhesion with SOD. Because it is 3. M. R. VanLandingham et al., J. Adhesion 64, 31 (1997). Kolosov, J. Phys. D 33, 2347 (2000). nondestructive, SNFUH may be an ideal tool- 4. B. Bhushan, L. Huiwen, Nanotechnology 15,1785 25. -
Surface of Ligeia Mare, Titan, from Cassini Altimeter and Radiometer Analysis Howard Zebker, Alex Hayes, Mike Janssen, Alice Le Gall, Ralph Lorenz, Lauren Wye
Surface of Ligeia Mare, Titan, from Cassini altimeter and radiometer analysis Howard Zebker, Alex Hayes, Mike Janssen, Alice Le Gall, Ralph Lorenz, Lauren Wye To cite this version: Howard Zebker, Alex Hayes, Mike Janssen, Alice Le Gall, Ralph Lorenz, et al.. Surface of Ligeia Mare, Titan, from Cassini altimeter and radiometer analysis. Geophysical Research Letters, American Geophysical Union, 2014, 41 (2), pp.308-313. 10.1002/2013GL058877. hal-00926152 HAL Id: hal-00926152 https://hal.archives-ouvertes.fr/hal-00926152 Submitted on 19 Jul 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. PUBLICATIONS Geophysical Research Letters RESEARCH LETTER Surface of Ligeia Mare, Titan, from Cassini 10.1002/2013GL058877 altimeter and radiometer analysis Key Points: Howard Zebker1, Alex Hayes2, Mike Janssen3, Alice Le Gall4, Ralph Lorenz5, and Lauren Wye6 • Ligeia Mare, like Ontario Lacus, is flat with no evidence of ocean waves or wind 1Departments of Geophysics and Electrical Engineering, Stanford University, Stanford, California, USA, 2Department of • The -
The Science Case for a Titan Flagship-Class Orbiter with Probes (White Paper for the NRC Decadal Survey for Planetary Science and Astrobiology) Conor A
The Science Case for a Titan Flagship-class Orbiter with Probes (White paper for the NRC Decadal Survey for Planetary Science and Astrobiology) Conor A. Nixon, James Abshire, Andrew Ashton, Jason W. Barnes, Nathalie Carrasco, Mathieu Choukroun, Athena Coustenis, Louis-Alexandre Couston, Niklas Edberg, Alexander Gagnon, et al. To cite this version: Conor A. Nixon, James Abshire, Andrew Ashton, Jason W. Barnes, Nathalie Carrasco, et al.. The Science Case for a Titan Flagship-class Orbiter with Probes (White paper for the NRC Decadal Survey for Planetary Science and Astrobiology). 2020. hal-03085250 HAL Id: hal-03085250 https://hal.archives-ouvertes.fr/hal-03085250 Preprint submitted on 21 Dec 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. The Science Case for a Titan Flagship-class Orbiter with Probes Authors: Conor A. Nixon, NASA Goddard Space Flight Center, USA Planetary Systems Laboratory, 8800 Greenbelt Road, Greenbelt, MD 20771 (301) 286-6757 [email protected] James Abshire, University oF Maryland, USA Andrew Ashton, Woods Hole Oceanographic Institution, USA Jason W. Barnes, University oF Idaho, USA Nathalie Carrasco, Université Paris-Saclay, France, Mathieu Choukroun, Jet Propulsion Laboratory, Caltech, USA Athena Coustenis, Paris Observatory, CNRS, PSL, France Louis-Alexandre Couston, British Antarctic Survey, UK Niklas Edberg, Swedish Institute oF Space Physics, Sweden Alexander Gagnon, University oF Washington, USA Jason D. -
Cassini Reveals Earth-Like Land on Titan 20 July 2006
Cassini Reveals Earth-like Land on Titan 20 July 2006 at the University of Arizona, Tucson. "Surprisingly, this cold, faraway region has geological features remarkably like Earth." Titan is a place of twilight, dimmed by a haze of hydrocarbons surrounding it. Cassini's radar instrument can see through the haze by bouncing radio signals off the surface and timing their return. In the radar images bright regions indicate rough or scattering material, while a dark region might be smoother or more absorbing material, possibly liquid. Xanadu was first discovered by NASA's Hubble Space Telescope in 1994 as a striking bright spot This radar image shows a network of river channels at seen in infrared imaging. When Cassini's radar Xanadu, the continent-sized region on Saturn's moon system viewed Xanadu on April 30, 2006, it found a Titan. Image credit: NASA/JPL surface modified by winds, rain, and the flow of liquids. At Titan's frigid temperatures, the liquid cannot be water; it is almost certainly methane or ethane. New radar images from NASA's Cassini spacecraft revealed geological features similar to Earth on "Although Titan gets far less sunlight and is much Xanadu, an Australia-sized, bright region on smaller and colder than Earth, Xanadu is no longer Saturn's moon Titan. just a mere bright spot, but a land where rivers flow down to a sunless sea," Lunine said. These radar images, from a strip more than 2,796 miles long, show Xanadu is surrounded by darker Observations by the European Space Agency's terrain, reminiscent of a free-standing landmass. -
Strategies for Detecting Biological Molecules on Titan
ASTROBIOLOGY Volume 18, Number 5, 2018 ª Mary Ann Liebert, Inc. DOI: 10.1089/ast.2017.1758 Strategies for Detecting Biological Molecules on Titan Catherine D. Neish,1 Ralph D. Lorenz,2 Elizabeth P. Turtle,2 Jason W. Barnes,3 Melissa G. Trainer,4 Bryan Stiles,5 Randolph Kirk,6 Charles A. Hibbitts,2 and Michael J. Malaska5 Abstract Saturn’s moon Titan has all the ingredients needed to produce ‘‘life as we know it.’’ When exposed to liquid water, organic molecules analogous to those found on Titan produce a range of biomolecules such as amino acids. Titan thus provides a natural laboratory for studying the products of prebiotic chemistry. In this work, we examine the ideal locales to search for evidence of, or progression toward, life on Titan. We determine that the best sites to identify biological molecules are deposits of impact melt on the floors of large, fresh impact craters, specifically Sinlap, Selk, and Menrva craters. We find that it is not possible to identify biomolecules on Titan through remote sensing, but rather through in situ measurements capable of identifying a wide range of biological molecules. Given the nonuniformity of impact melt exposures on the floor of a weathered impact crater, the ideal lander would be capable of precision targeting. This would allow it to identify the locations of fresh impact melt deposits, and/or sites where the melt deposits have been exposed through erosion or mass wasting. Determining the extent of prebiotic chemistry within these melt deposits would help us to understand how life could originate on a world very different from Earth. -
The Spectral Nature of Titan's Major Geomorphological Units
PUBLICATIONS Journal of Geophysical Research: Planets RESEARCH ARTICLE The Spectral Nature of Titan’s Major Geomorphological 10.1002/2017JE005477 Units: Constraints on Surface Composition Key Points: A. Solomonidou1,2,3 , A. Coustenis3, R. M. C. Lopes4 , M. J. Malaska4 , S. Rodriguez5, • ’ The spectral nature of some of Titan s 3 1 6 6 4 7 4 4 major geomorphological units at P. Drossart , C. Elachi , B. Schmitt , S. Philippe , M. Janssen , M. Hirtzig , S. Wall , C. Sotin , 4 2 8 9 10 11 12 midlatitudes is described using a K. Lawrence , N. Altobelli , E. Bratsolis , J. Radebaugh , K. Stephan , R. H. Brown , S. Le Mouélic , radiative transfer code A. Le Gall13, E. V. Villanueva4, J. F. Brossier10 , A. A. Bloom4 , O. Witasse14 , C. Matsoukas15, and • Three main categories of albedo 16 govern Titan’s low-midlatitude surface A. Schoenfeld regions, and its surface composition 1 2 has a latitudinal dependence California Institute of Technology, Pasadena, CA, USA, European Space Astronomy Centre, European Space Agency, Madrid, 3 • The surface albedo differences and Spain, LESIA-Observatoire de Paris, Paris Sciences and Letters Research University, CNRS, Sorbonne Université, Université similarities among the RoIs set Paris-Diderot, Meudon, France, 4Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA, 5Institut de constraints on possible formation Physique du Globe de Paris, CNRS-UMR 7154, Université Paris-Diderot, USPC, Paris, France, 6Institut de Planétologie et and/or evolution processes d’Astrophysique de Grenoble, Université Grenoble Alpes, CNRS, Grenoble, France, 7Fondation “La main à la pâte”, Montrouge, France, 8Department of Physics, University of Athens, Athens, Greece, 9Department of Geological Sciences, Brigham Young University, Provo, UT, USA, 10Institute of Planetary Research, DLR, Berlin, Germany, 11Lunar and Planetary Laboratory, University Correspondence to: of Arizona, Tucson, AZ, USA, 12Laboratoire de Planétologie et Géodynamique, CNRS UMR 6112, Université de Nantes, Nantes, A. -
The Lakes and Seas of Titan • Explore Related Articles • Search Keywords Alexander G
EA44CH04-Hayes ARI 17 May 2016 14:59 ANNUAL REVIEWS Further Click here to view this article's online features: • Download figures as PPT slides • Navigate linked references • Download citations The Lakes and Seas of Titan • Explore related articles • Search keywords Alexander G. Hayes Department of Astronomy and Cornell Center for Astrophysics and Planetary Science, Cornell University, Ithaca, New York 14853; email: [email protected] Annu. Rev. Earth Planet. Sci. 2016. 44:57–83 Keywords First published online as a Review in Advance on Cassini, Saturn, icy satellites, hydrology, hydrocarbons, climate April 27, 2016 The Annual Review of Earth and Planetary Sciences is Abstract online at earth.annualreviews.org Analogous to Earth’s water cycle, Titan’s methane-based hydrologic cycle This article’s doi: supports standing bodies of liquid and drives processes that result in common 10.1146/annurev-earth-060115-012247 Annu. Rev. Earth Planet. Sci. 2016.44:57-83. Downloaded from annualreviews.org morphologic features including dunes, channels, lakes, and seas. Like lakes Access provided by University of Chicago Libraries on 03/07/17. For personal use only. Copyright c 2016 by Annual Reviews. on Earth and early Mars, Titan’s lakes and seas preserve a record of its All rights reserved climate and surface evolution. Unlike on Earth, the volume of liquid exposed on Titan’s surface is only a small fraction of the atmospheric reservoir. The volume and bulk composition of the seas can constrain the age and nature of atmospheric methane, as well as its interaction with surface reservoirs. Similarly, the morphology of lacustrine basins chronicles the history of the polar landscape over multiple temporal and spatial scales. -
Titan's Cold Case Files
Titan’s cold case files - Outstanding questions after Cassini-Huygens C.A. Nixon, R.D. Lorenz, R.K. Achterberg, A. Buch, P. Coll, R.N. Clark, R. Courtin, A. Hayes, L. Iess, R.E. Johnson, et al. To cite this version: C.A. Nixon, R.D. Lorenz, R.K. Achterberg, A. Buch, P. Coll, et al.. Titan’s cold case files - Out- standing questions after Cassini-Huygens. Planetary and Space Science, Elsevier, 2018, 155, pp.50-72. 10.1016/j.pss.2018.02.009. insu-03318440 HAL Id: insu-03318440 https://hal-insu.archives-ouvertes.fr/insu-03318440 Submitted on 10 Aug 2021 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Distributed under a Creative Commons Attribution| 4.0 International License Planetary and Space Science 155 (2018) 50–72 Contents lists available at ScienceDirect Planetary and Space Science journal homepage: www.elsevier.com/locate/pss Titan's cold case files - Outstanding questions after Cassini-Huygens C.A. Nixon a,*, R.D. Lorenz b, R.K. Achterberg c, A. Buch d, P. Coll e, R.N. Clark f, R. Courtin g, A. Hayes h, L. Iess i, R.E. -
Composition, Seasonal Change and Bathymetry of Ligeia Mare, Titan, Derived from Its Microwave Thermal Emission Alice Le Gall, M.J
Composition, seasonal change and bathymetry of Ligeia Mare, Titan, derived from its microwave thermal emission Alice Le Gall, M.J. Malaska, R.D. Lorenz, M.A. Janssen, T. Tokano, A.G. Hayes, M. Mastrogiuseppe, J.I. Lunine, G. Veyssière, P. Encrenaz, et al. To cite this version: Alice Le Gall, M.J. Malaska, R.D. Lorenz, M.A. Janssen, T. Tokano, et al.. Composition, seasonal change and bathymetry of Ligeia Mare, Titan, derived from its microwave thermal emission. Journal of Geophysical Research. Planets, Wiley-Blackwell, 2016, 121 (2), pp.233-251. 10.1002/2015JE004920. hal-01259869 HAL Id: hal-01259869 https://hal.archives-ouvertes.fr/hal-01259869 Submitted on 8 Mar 2016 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. PUBLICATIONS Journal of Geophysical Research: Planets RESEARCH ARTICLE Composition, seasonal change, and bathymetry 10.1002/2015JE004920 of Ligeia Mare, Titan, derived from its Key Points: microwave thermal emission • Radiometry observations of Ligeia Mare support a liquid composition A. Le Gall1, M. J. Malaska2, R. D. Lorenz3, M. A. Janssen2, T. Tokano4, A. G. Hayes5, M. Mastrogiuseppe5, dominated by methane 5 6 7 8 • The seafloor of Ligeia Mare probably J. -
Production and Global Transport of Titan's Sand Particles
Barnes et al. Planetary Science (2015) 4:1 DOI 10.1186/s13535-015-0004-y ORIGINAL RESEARCH Open Access Production and global transport of Titan’s sand particles Jason W Barnes1*,RalphDLorenz2, Jani Radebaugh3, Alexander G Hayes4,KarlArnold3 and Clayton Chandler3 *Correspondence: [email protected] Abstract 1Department of Physics, University Previous authors have suggested that Titan’s individual sand particles form by either of Idaho, Moscow, Idaho, 83844-0903 USA sintering or by lithification and erosion. We suggest two new mechanisms for the Full list of author information is production of Titan’s organic sand particles that would occur within bodies of liquid: available at the end of the article flocculation and evaporitic precipitation. Such production mechanisms would suggest discrete sand sources in dry lakebeds. We search for such sources, but find no convincing candidates with the present Cassini Visual and Infrared Mapping Spectrometer coverage. As a result we propose that Titan’s equatorial dunes may represent a single, global sand sea with west-to-east transport providing sources and sinks for sand in each interconnected basin. The sand might then be transported around Xanadu by fast-moving Barchan dune chains and/or fluvial transport in transient riverbeds. A river at the Xanadu/Shangri-La border could explain the sharp edge of the sand sea there, much like the Kuiseb River stops the Namib Sand Sea in southwest Africa on Earth. Future missions could use the composition of Titan’s sands to constrain the global hydrocarbon cycle. We chose to follow an unconventional format with respect to our choice of section head- ings compared to more conventional practice because the multifaceted nature of our work did not naturally lend itself to a logical progression within the precribed system. -
THE SURFACE AGE of TITAN. Introduction
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Institute of Transport Research:Publications 40th Lunar and Planetary Science Conference (2009) 1641.pdf THE SURFACE AGE OF TITAN. Ralf Jaumann1,2,* and Gerhard Neukum2. 1DLR, Institute of Planetary Research. Rutherfordstrasse 2, 12489 Berlin, Germany; 2Dept. of Earth Sciences, Inst. of Geosciences, Freie Universität Berlin, Germany; Email address: [email protected] Introduction: Since its arrival at the Saturnian system, Titan’s surface with a slight increase on the trailing site the Cassini spacecraft has made about 100 Titan fly- (Fig.1). This observation appears to coincide with the bys. The surface of Titan has been revealed almost impactor model of Korycansky and Zahnle (2005) [10] globally by the Cassini observations in the infrared and who suggest that the leading hemisphere should have a regionally to about 25% in radar wavelengths [1,2,3] crater frequency about 5 times higher than the trailing as well as locally by the Huygens optical instruments side assuming Titan has been in synchronous rotation [4]. Extended dune fields, lakes, distinct landscapes of throughout its history. However, this observation may volcanic and tectonic origin, dendritic erosion patterns change in the course of the mission with increasing and deposited erosional remnants exhibit a high-resolution coverage which is so far poorer on the geologically active surface indicating significant leading site. The cumulative crater frequency is shown endogenic and exogenic processes leading to dynamic in Fig. 2 for both the confirmed five craters and the surface alteration. Consequently, impact craters are total of the putative craters.