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Program Accretion: Building New Worlds Conference August 15–18, 2017 • Houston, Texas Institutional Support Lunar and Planetary Institute Universities Space Research Association Conveners Jeff Cuzzi NASA Ames Research Center Christine Floss Washington University Harold Levison Southwest Research Institute Justin Simon NASA Johnson Space Center Allan Treiman Lunar and Planetary Institute Science Organizing Committee Hans-Peter Gail University of Heidelberg Levke Kööp University of Chicago Sebastiaan Krijt University of Chicago Ryan Ogliore Washington University, Saint Louis Cristina Thomas Planetary Science Institute Lunar and Planetary Institute 3600 Bay Area Boulevard Houston TX 77058-1113 Abstracts for this conference are available via the conference website at www.hou.usra.edu/meetings/accretion2017/ Abstracts can be cited as Author A. B. and Author C. D. (2017) Title of abstract. In Accretion: Building New Worlds Conference, Abstract #XXXX. LPI Contribution No. 2043, Lunar and Planetary Institute, Houston. Guide to Sessions Tuesday, August 15, 2017 8:30 a.m. Great Room Registration 9:00 a.m. Lecture Hall Early Protoplanetary Disks: Gas and Dust 2:00 p.m. Lecture Hall Growth and Motion of Larger Particles: CAIs and Chondrules Wednesday, August 16, 2017 9:00 a.m. Lecture Hall Environment and Timing of Planetesimal Formation: Isotopic Constraints 2:00 p.m. Lecture Hall Asteroidal Constraints on Planetesimal Formation 5:00 p.m. Great Room Poster Session Thursday, August 17, 2017 9:00 a.m. Lecture Hall Mechanisms of Planetesimal Formation 2:00 p.m. Lecture Hall Dynamics of Planetesimals: Mixing and Segregation Friday, August 18, 2017 9:00 a.m. Lecture Hall Accretion of Terrestrial Planets Program Tuesday, August 15, 2017 EARLY PROTOPLANETARY DISKS: GAS AND DUST 9:00 a.m. Lecture Hall Chair: Jeff Cuzzi 9:00 a.m. Treiman A. Kiefer W. * Welcome and Introduction 9:15 a.m. Cleeves L. I. * Zooming in on the Physics and Chemistry of Protoplanetary Disks with ALMA [#2052] During the protoplanetary disk phase, the physical environment and spatial composition of the disk play a direct role in the outcome of planet formation, both in the types of planets formed and their composition. 9:45 a.m. Banzatti A. * Pontoppidan K. M. Salyk C. van Dishoeck E. F. Herczeg G. J. Blake G. A. Garufi A. Kama M. Pascucci I. Edwards S. Revealing the Physical and Thermo-Chemical Evolution of Planet-Forming Disk Regions [#2016] We report results of a large campaign to reveal the evolving structure of planet-forming disks at 0.05– 20 au: cavities are formed in the terrestrial-planet zone, inner disks dry out within the snow line, while dust accretes and winds disperse. 10:05 a.m. Umurhan O. M. * Estrada P. R. Cuzzi J. N. Turbulence in Protoplanetary Disk Dead Zones — Recent Advances [#2044] In this talk I will review recent developments in our understanding of turbulence in planet forming accretion disks. 10:25 a.m. Hu Z. W. * Winarski R. P. Insights into Aggregation of Submicron Grains from 3-D Structure of a Primitive Fine-Grained Cosmic Dust Particle [#2042] We present new findings of the pristine structure and morphologies of an intact fine-grained cosmic dust particle in 3-D ~ 10 nm detail, which yield new insights into grain accretion in the outer protoplanetary disk. 10:40 a.m. Coffee Break 10:55 a.m. Garcia A. J. L. * Gonzalez J.-F. Growing Porous Grains in 3D SPH Simulations [#2003] In protoplanetary discs, grains grow through 13 orders of magnitude from submicrons to kilometers. In this work, we investigate growth and drift of grains with a changing porosity model in order to overcome the radial-drift barrier. 11:10 a.m. Brisset J. * Colwell J. E. Dove A. Maukonen D. Using Orbital Platforms to Study Planet Formation [#2002] We will present results from the ISS NanoRocks experiment as well as the design of the Q-PACE CubeSat to demonstrate how orbital miniaturized payloads can be used to collect unprecedented amounts of data on the collision behavior of PPD dust grains. 11:25 a.m. Wetteland C. J. * Crespillo M. Keffer D. J. Sickafus K. E. Taylor L. A. McSween H. Y. Jr. Experimental and Theoretical Considerations for Proton Processing of Early Solar System Solids [#2018] Developing stars variably discharge energetic particles over the course of their evolution. Experimental and theoretical approaches have been examined to explore how energetic particles may process early solar materials in the first billion years. 11:40 a.m. Ogliore R. C. * Cometary Dust and the Young Solar System [#2041] Precise microanalyses of cometary dust have yielded insight into the early history and far outer reaches of our solar system. 12:10 p.m. GENERAL DISCUSSION 12:30 p.m. Lunch Tuesday, August 15, 2017 GROWTH AND MOTION OF LARGER PARTICLES: CAIs AND CHONDRULES 2:00 p.m. Lecture Hall Chair: Levke Kööp 2:00 p.m. Estrada P. R. * Cuzzi J. N. Growth and Drift of Solids in Protoplanetary Nebulae [#2047] The earliest stages of planetary formation are still poorly understood. The growth from dust-to- planetesimals remains the roadblock in our interpretation of how planetary systems form and their architecture. We discuss the current state of the field. 2:30 p.m. Krijt S. * Schwarz K. Ciesla F. J. Bergin E. A. Connecting CO Abundances Before, During, and After Pebble Migration [#2043] Pebbles form, sink, drift / Moving ices back and forth / Where does CO go? 3:00 p.m. Desch S. J. * How Chondrules and Calcium-Rich, Aluminum-Rich Inclusions Constrain Disk Processes and Planet Formation [#2046] I review how chondrules and CAIs constrain the disk processes and planet formation. 3:30 p.m. Coffee Break 3:45 p.m. Perez A. M. * Desch S. J. Schrader D. L. Till C. B. Determining the Relative Timing of Formation of Chondrules vs. Planetary Embryos Through Experiments [#2037] We have conducted vertical furnace experiments to investigate cooling rates consistent with the planetary embryo bow shock model to determine the relative timing of formation of chondrules versus planetary embryos. 4:00 p.m. Hanna R. D. * Ketcham R. A. Evidence for Accretion of Fine-Grained Rims in a Turbulent Nebula for CM Murchison [#2012] The 3D morphology of FGRs and enclosed chondrules indicate that FGRs formed in a weakly turbulent nebula and that chondrule surface morphology influenced the amount of dust accreted to the chondrule. 4:15 p.m. Xiang C. * Matthews L. S. Carballido A. Morris M. A. Hyde T. W. Modeling the Growth of Chondrule Dust Rims with Molecular Dynamics [#2048] We present a method to investigate the structure of dust rims formed around chondrules as the latter sweep up dust in the nebula gas, by using an N-body code to model the collision processes of micron sized aggregates with a mm-sized spherical body. 4:30 p.m. Simon J. I. * McCain K. A. Cato M. J. Christoffersen P. A. Fisher K. R. Srinivasan P. Tait A. W. Cuzzi J. N. Broad Size-Dependent Particle Populations in Chondritic Meteorites: Implications for Planetary Accretion [#2009] Instead of the relatively narrow size-frequency distributions often used in astrophysical models to simulate the dynamics of protoplanetary disks, we observe broad size-frequency distributions across all particle types in primitive meteorites. 4:45 p.m. GENERAL DISCUSSION Wednesday, August 16, 2017 ENVIRONMENT AND TIMING OF PLANETESIMAL FORMATION: ISOTOPIC CONSTRAINTS 9:00 a.m. Lecture Hall Chair: Allan Treiman 9:00 a.m. Dwarkadas V. V. * Dauphas N. Meyer B. S. Boyajian P. H. Bojazi M. Abundances of Short-Lived Radionuclides and the Implications for the Formation of the Solar System [#2004] Analysis of primordial meteorites shows a high abundance of 26Al, accompanied by low 60Fe. This indicates that our solar system originated within a Wolf-Rayet bubble formed by stellar mass-loss from a massive star that was the main source of 26Al. 9:15 a.m. Wadhwa M. * Meteoritic Constraints on Timescales of Planetesimal Accretion in the Early Solar System [#2053] The details of the physical processes involved in the accretion of planetesimals in the early solar system are not well understood, and have been the focus of several recent theoretical modeling investigations. 9:45 a.m. Simon J. I. * Utilizing Stable Isotopes and Isotopic Anomalies to Study Early Solar System Formation Processes [#2023] Invited talk on stable isotope record of early formed planetary materials. 10:15 a.m. Kita N. T. * Tenner T. J. Ushikubo T. Nakashima D. Defouilloy C. Hertwig A. T. Chaumard N. Rudraswami N. G. Weisberg M. K. Kimura M. Nagahara H. Bischoff A. Oxygen Isotope Systematics in Chondrules from Multiple Chondrite Groups: Implication to the Isotope Reservoirs in the Protoplanetary Disk [#2020] SIMS O-isotope analyses of ~600 chondrules show systematics variability among chondrite groups that are related to Fe redox states. Inner disk might be homogenized in O-isotopes, while outer disk might have 16O-rich dry dust and 16O-poor water ice. 10:35 a.m. Coffee Break 10:50 a.m. Kööp L. * Davis A. M. Accretion and Processing of Presolar Components as Recorded by Nebular Materials [#2035] We review the 26Al-26Mg, Ca, Ti, and O isotopic systematics of different generations of nebular materials in order to trace the arrival, processing, and origin of different stellar components in the solar nebula. 11:10 a.m. Goodrich C. A. * The Carbonaceous - Non-Carbonaceous Chondrite Reservoir Dichotomy and the Challenge of Ureilites [#2013] Solar system materials are strongly divided into CC (carbonaceous chondrite) and NCC (non-CC) groups in terms of nucleosynthetic isotope anomalies. Ureilites are in the NCC group but seem to have had volatile-rich precursors. How could this be? 11:25 a.m. Keller L. P.
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