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Crater Gradation in Gusev Crater and Meridiani Planum, Mars J
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 111, E02S08, doi:10.1029/2005JE002465, 2006 Crater gradation in Gusev crater and Meridiani Planum, Mars J. A. Grant,1 R. E. Arvidson,2 L. S. Crumpler,3 M. P. Golombek,4 B. Hahn,5 A. F. C. Haldemann,4 R. Li,6 L. A. Soderblom,7 S. W. Squyres,8 S. P. Wright,9 and W. A. Watters10 Received 19 April 2005; revised 21 June 2005; accepted 27 June 2005; published 6 January 2006. [1] The Mars Exploration Rovers investigated numerous craters in Gusev crater and Meridiani Planum during the first 400 sols of their missions. Craters vary in size and preservation state but are mostly due to secondary impacts at Gusev and primary impacts at Meridiani. Craters at both locations are modified primarily by eolian erosion and infilling and lack evidence for modification by aqueous processes. Effects of gradation on crater form are dependent on size, local lithology, slopes, and availability of mobile sediments. At Gusev, impacts into basaltic rubble create shallow craters and ejecta composed of resistant rocks. Ejecta initially experience eolian stripping, which becomes weathering-limited as lags develop on ejecta surfaces and sediments are trapped within craters. Subsequent eolian gradation depends on the slow production of fines by weathering and impacts and is accompanied by minor mass wasting. At Meridiani the sulfate-rich bedrock is more susceptible to eolian erosion, and exposed crater rims, walls, and ejecta are eroded, while lower interiors and low-relief surfaces are increasingly infilled and buried by mostly basaltic sediments. Eolian processes outpace early mass wasting, often produce meters of erosion, and mantle some surfaces. -
Echo Exoplanet Characterisation Observatory
Exp Astron (2012) 34:311–353 DOI 10.1007/s10686-012-9303-4 ORIGINAL ARTICLE EChO Exoplanet characterisation observatory G. Tinetti · J. P. Beaulieu · T. Henning · M. Meyer · G. Micela · I. Ribas · D. Stam · M. Swain · O. Krause · M. Ollivier · E. Pace · B. Swinyard · A. Aylward · R. van Boekel · A. Coradini · T. Encrenaz · I. Snellen · M. R. Zapatero-Osorio · J. Bouwman · J. Y-K. Cho · V. Coudé du Foresto · T. Guillot · M. Lopez-Morales · I. Mueller-Wodarg · E. Palle · F. Selsis · A. Sozzetti · P. A. R. Ade · N. Achilleos · A. Adriani · C. B. Agnor · C. Afonso · C. Allende Prieto · G. Bakos · R. J. Barber · M. Barlow · V. Batista · P. Bernath · B. Bézard · P. Bordé · L. R. Brown · A. Cassan · C. Cavarroc · A. Ciaravella · C. Cockell · A. Coustenis · C. Danielski · L. Decin · R. De Kok · O. Demangeon · P. Deroo · P. Doel · P. Drossart · L. N. Fletcher · M. Focardi · F. Forget · S. Fossey · P. Fouqué · J. Frith · M. Galand · P. Gaulme · J. I. González Hernández · O. Grasset · D. Grassi · J. L. Grenfell · M. J. Griffin · C. A. Griffith · U. Grözinger · M. Guedel · P. Guio · O. Hainaut · R. Hargreaves · P. H. Hauschildt · K. Heng · D. Heyrovsky · R. Hueso · P. Irwin · L. Kaltenegger · P. Kervella · D. Kipping · T. T. Koskinen · G. Kovács · A. La Barbera · H. Lammer · E. Lellouch · G. Leto · M. A. Lopez Valverde · M. Lopez-Puertas · C. Lovis · A. Maggio · J. P. Maillard · J. Maldonado Prado · J. B. Marquette · F. J. Martin-Torres · P. Maxted · S. Miller · S. Molinari · D. Montes · A. Moro-Martin · J. I. Moses · O. Mousis · N. Nguyen Tuong · R. -
Amphipod Newsletter 39 (2015)
AMPHIPOD NEWSLETTER 39 2015 Interviews BIBLIOGRAPHY THIS NEWSLETTER PAGE 19 FEATURES INTERVIEWS WITH ALICJA KONOPACKA AND KRZYSZTOF JAŻDŻEWSKI PAGE 2 MICHEL LEDOYER WORLD AMPHIPODA IN MEMORIAM DATABASE PAGE 14 PAGE 17 AMPHIPOD NEWSLETTER 39 Dear Amphipodologists, Statistics from We are delighted to present to you Amphipod Newsletter 39! this Newsletter This issue includes interviews with two members of our amphipod family – Alicja Konopacka and Krzysztof Jazdzewski. Both tell an amazing story of their lives and work 2 new subfamilies as amphipodologists. Sadly we lost a member of our amphipod 21 new genera family – Michel Ledoyer. Denise Bellan-Santini provides us with a fitting memorial to his life and career. Shortly many 145 new species members of the amphipod family will gather for the 16th ICA in 5 new subspecies Aveiro, Portugal. And plans are well underway for the 17th ICA in Turkey (see page 64 for more information). And, as always, we provide you with a Bibliography and index of amphipod publications that includes citations of 376 papers that were published in 2013-2015 (or after the publication of Amphipod Newsletter 38). Again, what an amazing amount of research that has been done by you! Please continue to notify us when your papers are published. We hope you enjoy your Amphipod Newsletter! Best wishes from your AN Editors, Wim, Adam, Miranda and Anne Helene !1 AMPHIPOD NEWSLETTER 39 2015 Interview with two prominent members of the “Polish group”. The group of amphipod workers in Poland has always been a visible and valued part of the amphipod society. They have organised two of the Amphipod Colloquia and have steadily provided important results in the world of amphipod science. -
In-System'' Fission-Events: an Insight Into Puzzles of Exoplanets and Stars?
universe Review “In-System” Fission-Events: An Insight into Puzzles of Exoplanets and Stars? Elizabeth P. Tito 1,* and Vadim I. Pavlov 2,* 1 Scientific Advisory Group, Pasadena, CA 91125, USA 2 Faculté des Sciences et Technologies, Université de Lille, F-59000 Lille, France * Correspondence: [email protected] (E.P.T.); [email protected] (V.I.P.) Abstract: In expansion of our recent proposal that the solar system’s evolution occurred in two stages—during the first stage, the gaseous giants formed (via disk instability), and, during the second stage (caused by an encounter with a particular stellar-object leading to “in-system” fission- driven nucleogenesis), the terrestrial planets formed (via accretion)—we emphasize here that the mechanism of formation of such stellar-objects is generally universal and therefore encounters of such objects with stellar-systems may have occurred elsewhere across galaxies. If so, their aftereffects may perhaps be observed as puzzling features in the spectra of individual stars (such as idiosyncratic chemical enrichments) and/or in the structures of exoplanetary systems (such as unusually high planet densities or short orbital periods). This paper reviews and reinterprets astronomical data within the “fission-events framework”. Classification of stellar systems as “pristine” or “impacted” is offered. Keywords: exoplanets; stellar chemical compositions; nuclear fission; origin and evolution Citation: Tito, E.P.; Pavlov, V.I. “In-System” Fission-Events: An 1. Introduction Insight into Puzzles of Exoplanets As facilities and techniques for astronomical observations and analyses continue to and Stars?. Universe 2021, 7, 118. expand and gain in resolution power, their results provide increasingly detailed information https://doi.org/10.3390/universe about stellar systems, in particular, about the chemical compositions of stellar atmospheres 7050118 and structures of exoplanets. -
Mineralogy of Super-Earth Planets
This article was originally published in Treatise on Geophysics, Second Edition, published by Elsevier, and the attached copy is provided by Elsevier for the author's benefit and for the benefit of the author's institution, for non-commercial research and educational use including without limitation use in instruction at your institution, sending it to specific colleagues who you know, and providing a copy to your institution’s administrator. All other uses, reproduction and distribution, including without limitation commercial reprints, selling or licensing copies or access, or posting on open internet sites, your personal or institution’s website or repository, are prohibited. For exceptions, permission may be sought for such use through Elsevier's permissions site at: http://www.elsevier.com/locate/permissionusematerial Duffy T., Madhusudhan N. and Lee K.K.M Mineralogy of Super-Earth Planets. In: Gerald Schubert (editor-in-chief) Treatise on Geophysics, 2nd edition, Vol 2. Oxford: Elsevier; 2015. p. 149-178. Author's personal copy 2.07 Mineralogy of Super-Earth Planets T Duffy, Princeton University, Princeton, NJ, USA N Madhusudhan, University of Cambridge, Cambridge, UK KKM Lee, Yale University, New Haven, CT, USA ã 2015 Elsevier B.V. All rights reserved. 2.07.1 Introduction 149 2.07.2 Overview of Super-Earths 150 2.07.2.1 What Is a Super-Earth? 150 2.07.2.2 Observations of Super-Earths 151 2.07.2.3 Interior Structure and Mass–Radius Relationships 151 2.07.2.4 Selected Super-Earths 154 2.07.2.5 Super-Earth Atmospheres 155 2.07.3 Theoretical -
A Preliminary Report on Expeditions Monsoon And
A Preliminary Report on Expeditions Monsoon and Lusiad 1960 - 1963 University of California, San Diego Scripps Institution of Oceanography Cruises to the Indian Ocean By The Members of the Expedition Edited by Robert L. Fisher S. I. O. Reference 64-19 ― i ― FOREWORD Field participation in the International Indian Ocean Expedition by scientists and research vessels of the University of California's Scripps Institution of Oceanography comprises three multi- program investigations: MONSOON (1960-1), LUSIAD (1962-3) and DODO (1964). All three expeditions, though first broadly outlined in 1959, lie within the cooperative international exploration of the Indian Ocean being sponsored by the Scientific Committee on Oceanic Research and UNESCO. Therefore, though original schedules have to date been met, the programs have in fact been influenced and modified by the plans, interests and findings of other agencies and laboratories, and direct participation by marine scientists, students and trainees from other areas has been welcomed. Although the final SIO IIOE cruise, DODO, is just underway, a preliminary report on some generalized results of the first two expeditions seems appropriate now, with the clear understanding that many conclusions stated here may indeed be premature. Final analyses, syntheses and results will appear in more specialized formal publications and in the proposed SCOR-sponsored atlases which eventually will summarize Indian Ocean Expedition findings. At Scripps Institution, it is customary to give names, rather than number designations, to the major expeditions. The 1960-1 investigation, 3 ½ months in the Indian Ocean, embraced the first SIO field work in the "monsoon seas". It was funded primarily by the Office of Naval Research of the Navy Department, with auxiliary support for personnel and special equipment from the Bureau of Ships and the National Science Foundation. -
From Dust to Dust: Protoplanetary Disk Accretion, Hot Jupiter Climates, and the Evaporation of Rocky Planets
UC Berkeley UC Berkeley Electronic Theses and Dissertations Title From Dust to Dust: Protoplanetary Disk Accretion, Hot Jupiter Climates, and the Evaporation of Rocky Planets Permalink https://escholarship.org/uc/item/9jq3136f Author Perez-Becker, Daniel Alonso Publication Date 2013 Peer reviewed|Thesis/dissertation eScholarship.org Powered by the California Digital Library University of California From Dust to Dust: Protoplanetary Disk Accretion, Hot Jupiter Climates, and the Evaporation of Rocky Planets By Daniel Alonso Perez-Becker A dissertation submitted in partial satisfaction of the requirements for the degree of Doctor of Philosophy in Physics in the Graduate Division of the University of California, Berkeley Committee in charge: Professor Eugene Chiang, Co-chair Professor Christopher McKee, Co-chair Professor Eliot Quataert Professor Geoffrey Marcy Fall 2013 From Dust to Dust: Protoplanetary Disk Accretion, Hot Jupiter Climates, and the Evaporation of Rocky Planets Copyright 2013 by Daniel Alonso Perez-Becker 1 Abstract From Dust to Dust: Protoplanetary Disk Accretion, Hot Jupiter Climates, and the Evaporation of Rocky Planets by Daniel Alonso Perez-Becker Doctor of Philosophy in Physics University of California, Berkeley Professor Eugene Chiang, Co-chair Professor Christopher McKee, Co-chair This dissertation is composed of three independent projects in astrophysics concerning phenomena that are concurrent with the birth, life, and death of planets. In Chapters 1 & 2, we study surface layer accretion in protoplanetary disks driven stellar X-ray and far-ultraviolet (FUV) radiation. In Chapter 3, we identify the dynamical mechanisms that control atmospheric heat redistribution on hot Jupiters. Finally, in Chapter 4, we characterize the death of low-mass, short-period rocky planets by their evaporation into a dusty wind. -
Arxiv:1711.02098V2 [Astro-Ph.EP] 13 Jan 2018
Draft version January 16, 2018 Typeset using LATEX twocolumn style in AASTeX61 SIMULATED JWST/NIRISS TRANSIT SPECTROSCOPY OF ANTICIPATED TESS PLANETS COMPARED TO SELECT DISCOVERIES FROM SPACE-BASED AND GROUND-BASED SURVEYS Dana R. Louie,1 Drake Deming,1, 2 Loic Albert,3 L. G. Bouma,4 Jacob Bean,5, 2 and Mercedes Lopez-Morales6, 2 1Department of Astronomy, University of Maryland, College Park, MD 20742, USA 2TESS Atmospheric Characterization Working Group 3Institut de recherche sur les exoplanetes (iREx), Universite de Montreal, Montreal, Quebec, Canada 4Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08540, USA 5Department of Astronomy and Astrophysics, University of Chicago, IL 60637, USA 6Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA Submitted to PASP ABSTRACT The Transiting Exoplanet Survey Satellite (TESS) will embark in 2018 on a 2-year wide-field survey mission, discov- ering over a thousand terrestrial, super-Earth and sub-Neptune-sized exoplanets (Rpl ≤ 4R⊕) potentially suitable for follow-up observations using the James Webb Space Telescope (JWST). This work aims to understand the suitability of anticipated TESS planet discoveries for atmospheric characterization by JWST's Near InfraRed Imager and Slitless Spectrograph (NIRISS) by employing a simulation tool to estimate the signal-to-noise (S/N) achievable in transmission spectroscopy. We applied this tool to Monte Carlo predictions of the TESS expected planet yield and then compared the S/N for anticipated TESS discoveries to our estimates of S/N for 18 known exoplanets. We analyzed the sensitivity of our results to planetary composition, cloud cover, and presence of an observational noise floor. -
Part 1: the 1.7 and 3.9 Earth Radii Rule
Hi this is Steve Nerlich from Cheap Astronomy www.cheapastro.com and this is What are exoplanets made of? Part 1: The 1.7 and 3.9 earth Radii rule. As of August 2016, the current count of confirmed exoplanets is up around 3,400 in 2,617 systems – with 590 of those systems confirmed to be multiplanet systems. And the latest thinking is that if you want to understand what exoplanets are made of you need to appreciate the physical limits of planet-hood, which are defined by the boundaries of 1.7 and 3.9 Earth radii . Consider that the make-up of an exoplanet is largely determined by the elemental make up of its protoplanetary disk. While most material in the Universe is hydrogen and helium – these are both tenuous gases. In order to generate enough gravity to hang on to them, you need a lot of mass to start with. So, if you’re Earth, or anything up to 1.7 times the radius of Earth – you’ve got no hope of hanging onto more than a few traces of elemental hydrogen and helium. Indeed, any exoplanet that’s less than 1.7 Earth radii has to be primarily composed of non-volatiles – that is, things that don’t evaporate or blow away easily – to have any chance of gravitationally holding together. A non-volatile exoplanet might be made of rock – which for our Solar System is a primarily silicon/oxygen based mineral matrix, but as we’ll hear, small sub-1.7 Earth radii exoplanets could be made of a whole range of other non-volatile materials. -
Super-Dense Remnants of Gas Giant Exoplanets
EPSC Abstracts Vol. 8, EPSC2013-986-1, 2013 European Planetary Science Congress 2013 EEuropeaPn PlanetarSy Science CCongress c Author(s) 2013 Super-dense remnants of gas giant exoplanets A. Mocquet (1), O. Grasset (1) and C. Sotin (2) (1) Laboratoire de Planétologie et Géodynamique UMR 6112, Nantes University, France ([email protected] / Fax:+33-2-51125268, (2) Jet Propulsion Laboratory, Caltech, Pasadena, California, USA Abstract of metallic materials is performed through the Mie- Grüneisen-Debye theory, which provides comparable The masses that have been observed for three large results to both ANEOS and Thomas-Fermi-Dirac exoplanets, Kepler-52b, Kepler-52c, and Kepler-57b, formulations up to a few tens of TPa [2]. The are between 30 and 100 times the Earth mass, which mechanical effects induced by the loss of the massive implies densities higher than iron planets of the same atmosphere are described by a pressure unloading of sizes. We propose that these planets could represent the solid core surface, and by a consequent increase the naked solid cores of gas giants that would have of volume and decrease of the density. Following the lost their atmospheres, for instance during their methods employed to investigate the deformation of migration towards their star, and investigate the the Earth’s mantle by surface loads [4], the evolution conditions under which the density of these cores of the unloading and associated decompression could remain close to their initial highly pressurized processes, is assessed by the convolution of a time- state. dependent source, the extensive surface stress, with the time varying viscoelastic response of the 1. -
Composition and Fate of Short-Period Super-Earths: the Case of Corot-7B
Astronomy & Astrophysics manuscript no. corot7b_Rv7pdf c ESO 2018 November 12, 2018 Composition and fate of short-period super-Earths The case of CoRoT-7b D. Valencia1, M. Ikoma1;2, T. Guillot1, and N. Nettelmann3 1 Observatoire de la C^oted'Azur, Universit´ede Nice-Sophia Antipolis, CNRS UMR 6202, BP 4229, F-06304 Nice Cedex 4, France 2 Dept. of Earth and Planetary Sciences, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8551, Japan 3 Institut f¨urPhysik, Universit¨atRostock, D-18051 Rostock, Germany Preprint online version: November 12, 2018 ABSTRACT Context. The discovery of CoRoT-7b, a planet of radius 1:68 ± 0:09 R⊕, mass 4:8 ± 0:8; M⊕ and orbital period of 0:854 days demonstrates that small planets can orbit extremely close to their star. Aims. Several questions arise concerning this planet, in particular concerning its possible composition, and fate. Methods. We use knowledge of hot Jupiters, mass loss estimates and models for the interior structure and evolution of planets to understand its composition, structure and evolution. Results. The inferred mass and radius of CoRoT-7b are consistent with a rocky planet that would be significantly depleted in iron relative to the Earth. However, a one sigma increase in mass (5:6 M⊕) and one sigma decrease in size (1:59 R⊕) would make the planet compatible with an Earth-like composition (33% iron, 67% silicates). Alternatively, it is possible that CoRoT-7b contains a significant amount of volatiles. For a planet made of an Earth-like interior and an outer volatile-rich vapor envelope, an equally good fit to the measured mass and radius is found for a mass of the vapor envelope equal to 3% (and up to 10% at most) of the planetary mass. -
The Kongolese Atlantic: Central African Slavery & Culture From
The Kongolese Atlantic: Central African Slavery & Culture from Mayombe to Haiti by Christina Frances Mobley Department of History Duke University Date:_______________________ Approved: ___________________________ Laurent Dubois, Supervisor ___________________________ Bruce Hall ___________________________ Janet J. Ewald ___________________________ Lisa Lindsay ___________________________ James Sweet Dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of History in the Graduate School of Duke University 2015 i v ABSTRACT The Kongolese Atlantic: Central African Slavery & Culture from Mayombe to Haiti by Christina Frances Mobley Department of History Duke University Date:_______________________ Approved: ___________________________ Laurent Dubois, Supervisor ___________________________ Bruce Hall ___________________________ Janet J. Ewald ___________________________ Lisa Lindsay ___________________________ James Sweet An abstract of a dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of History in the Graduate School of Duke University 2015 Copyright by Christina Frances Mobley 2015 Abstract In my dissertation, “The Kongolese Atlantic: Central African Slavery & Culture from Mayombe to Haiti,” I investigate the cultural history of West Central African slavery at the height of the trans-Atlantic slave trade, the late eighteenth century. My research focuses on the Loango Coast, a region that has received