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What are the benefits of delisting endangered species and who receives them?: Lessons from the gray wolf recovery in Greater Yellowstone 期刊论文
ECOLOGICAL ECONOMICS, 2020, 174
作者:  Sims, Charles;  Aadland, David;  Finnoff, David;  Hochard, Jacob
收藏  |  浏览/下载:15/0  |  提交时间:2020/08/18
Endangered Species Act  Conservation  Gray wolf  Yellowstone National Park  Livestock depredation  
Molecular hydrogen in minerals as a clue to interpret partial derivative D variations in the mantle 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Moine, B. N.;  Bolfan-Casanova, N.;  Radu, I. B.;  Ionov, D. A.;  Costin, G.;  Korsakov, A., V;  Golovin, A., V;  Oleinikov, O. B.;  Deloule, E.;  Cottin, J. Y.
收藏  |  浏览/下载:12/0  |  提交时间:2020/07/21
Low thermal conductivity of iron-silicon alloys at Earth's core conditions with implications for the geodynamo 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Hsieh, Wen-Pin;  Goncharov, Alexander F.;  Labrosse, Stephane;  Holtgrewe, Nicholas;  Lobanov, Sergey S.;  Chuvashova, Irina;  Deschamps, Frederic;  Lin, Jung-Fu
收藏  |  浏览/下载:12/0  |  提交时间:2020/07/06
A remnant planetary core in the hot-Neptune desert 期刊论文
NATURE, 2020, 583 (7814) : 39-+
作者:  David J. Armstrong;  Thé;  o A. Lopez;  Vardan Adibekyan;  Richard A. Booth;  Edward M. Bryant;  Karen A. Collins;  Magali Deleuil;  Alexandre Emsenhuber;  Chelsea X. Huang;  George W. King;  Jorge Lillo-Box;  Jack J. Lissauer;  Elisabeth Matthews;  Olivier Mousis;  Louise D. Nielsen;  Hugh Osborn;  Jon Otegi;  Nuno C. Santos;  ;  rgio G. Sousa;  Keivan G. Stassun;  Dimitri Veras;  Carl Ziegler;  Jack S. Acton;  Jose M. Almenara;  David R. Anderson;  David Barrado;  Susana C. C. Barros;  Daniel Bayliss;  Claudia Belardi;  Francois Bouchy;  ;  sar Briceñ;  o;  Matteo Brogi;  David J. A. Brown;  Matthew R. Burleigh;  Sarah L. Casewell;  Alexander Chaushev;  David R. Ciardi;  Kevin I. Collins;  Knicole D. Coló;  n;  Benjamin F. Cooke;  Ian J. M. Crossfield;  Rodrigo F. Dí;  az;  Elisa Delgado Mena;  Olivier D. S. Demangeon;  Caroline Dorn;  Xavier Dumusque;  Philipp Eigmü;  ller;  Michael Fausnaugh;  Pedro Figueira;  Tianjun Gan;  Siddharth Gandhi;  Samuel Gill;  Erica J. Gonzales;  Michael R. Goad;  Maximilian N. Gü;  nther;  Ravit Helled;  Saeed Hojjatpanah;  Steve B. Howell;  James Jackman;  James S. Jenkins;  Jon M. Jenkins;  Eric L. N. Jensen;  Grant M. Kennedy;  David W. Latham;  Nicholas Law;  Monika Lendl;  Michael Lozovsky;  Andrew W. Mann;  Maximiliano Moyano;  James McCormac;  Farzana Meru;  Christoph Mordasini;  Ares Osborn;  Don Pollacco;  Didier Queloz;  Liam Raynard;  George R. Ricker;  Pamela Rowden;  Alexandre Santerne;  Joshua E. Schlieder;  Sara Seager;  Lizhou Sha;  Thiam-Guan Tan;  Rosanna H. Tilbrook;  Eric Ting;  Sté;  phane Udry;  Roland Vanderspek;  Christopher A. Watson;  Richard G. West;  Paul A. Wilson;  Joshua N. Winn;  Peter Wheatley;  Jesus Noel Villasenor;  Jose I. Vines;  Zhuchang Zhan
收藏  |  浏览/下载:20/0  |  提交时间:2020/07/06

The interiors of giant planets remain poorly understood. Even for the planets in the Solar System, difficulties in observation lead to large uncertainties in the properties of planetary cores. Exoplanets that have undergone rare evolutionary processes provide a route to understanding planetary interiors. Planets found in and near the typically barren hot-Neptune '  desert'  (1,2)(a region in mass-radius space that contains few planets) have proved to be particularly valuable in this regard. These planets include HD149026b(3), which is thought to have an unusually massive core, and recent discoveries such as LTT9779b(4)and NGTS-4b(5), on which photoevaporation has removed a substantial part of their outer atmospheres. Here we report observations of the planet TOI-849b, which has a radius smaller than Neptune'  s but an anomalously large mass of39.1-2.6+2.7Earth masses and a density of5.2-0.8+0.7grams per cubic centimetre, similar to Earth'  s. Interior-structure models suggest that any gaseous envelope of pure hydrogen and helium consists of no more than3.9-0.9+0.8 per cent of the total planetary mass. The planet could have been a gas giant before undergoing extreme mass loss via thermal self-disruption or giant planet collisions, or it could have avoided substantial gas accretion, perhaps through gap opening or late formation(6). Although photoevaporation rates cannot account for the mass loss required to reduce a Jupiter-like gas giant, they can remove a small (a few Earth masses) hydrogen and helium envelope on timescales of several billion years, implying that any remaining atmosphere on TOI-849b is likely to be enriched by water or other volatiles from the planetary interior. We conclude that TOI-849b is the remnant core of a giant planet.


Observations of TOI-849b reveal a radius smaller than Neptune'  s but a large mass of about 40 Earth masses, indicating that the planet is the remnant core of a gas giant.


  
Geometry of the ideal free distribution: individual behavioural variation and annual reproductive success in aggregations of a social ungulate 期刊论文
ECOLOGY LETTERS, 2020
作者:  Bonar, Maegwin;  Lewis, Keith P.;  Webber, Quinn M. R.;  Dobbin, Maria;  Laforge, Michel P.;  Vander Wal, Eric
收藏  |  浏览/下载:10/0  |  提交时间:2020/07/06
Aggregation  calf survival  caribou  geometry of the selfish herd  ideal free distribution  nearest neighbour  repeatability  reproductive success  social environment  
Amplified Madden-Julian oscillation impacts in the Pacific-North America region 期刊论文
NATURE CLIMATE CHANGE, 2020, 10 (7) : 654-+
作者:  Zhou, Wenyu;  Yang, Da;  Xie, Shang-Ping;  Ma, Jing
收藏  |  浏览/下载:9/0  |  提交时间:2020/07/06
Were changes in stress state responsible for the 2019 Ridgecrest, California, earthquakes? 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Nanjo, K. Z.
收藏  |  浏览/下载:5/0  |  提交时间:2020/06/22
A seawater throttle on H-2 production in Precambrian serpentinizing systems 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (26) : 14756-14763
作者:  Tutolo, Benjamin M.;  Seyfried, William E., Jr.;  Tosca, Nicholas J.
收藏  |  浏览/下载:9/0  |  提交时间:2020/06/22
serpentinization  Precambrian  atmosphere redox state  origins of life  
Understanding rate effects in injection-induced earthquakes 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Alghannam, Maryam;  Juanes, Ruben
收藏  |  浏览/下载:6/0  |  提交时间:2020/06/22
Massive formation of early diagenetic dolomite in the Ediacaran ocean: Constraints on the "dolomite problem" 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (25) : 14005-14014
作者:  Chang, Biao;  Li, Chao;  Liu, Deng;  Foster, Ian;  Tripati, Aradhna;  Lloyd, Max K.;  Maradiaga, Ingrid;  Luo, Genming;  An, Zhihui;  She, Zhenbing;  Xie, Shucheng;  Tong, Jinnan;  Huang, Junhua;  Algeo, Thomas J.;  Lyons, Timothy W.;  Immenhauser, Adrian
收藏  |  浏览/下载:17/0  |  提交时间:2020/06/16
Doushantuo Formation  clumped isotope  early diagenesis  carbonate geochemistry  early oceans