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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.


  
Global airborne sampling reveals a previously unobserved dimethyl sulfide oxidation mechanism in the marine atmosphere 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (9) : 4505-4510
作者:  Veres, Patrick R.;  Neuman, J. Andrew;  Bertram, Timothy H.;  Assaf, Emmanuel;  Wolfe, Glenn M.;  Williamson, Christina J.;  Weinzierl, Bernadett;  Tilmes, Simone;  Thompson, Chelsea R.;  Thames, Alexander B.;  Schroder, Jason C.;  Saiz-Lopez, Alfonso;  Rollins, Andrew W.;  Roberts, James M.;  Price, Derek;  Peischl, Jeff;  Nault, Benjamin A.;  Moller, Kristian H.;  Miller, David O.;  Meinardi, Simone;  Li, Qinyi;  Lamarque, Jean-Francois;  Kupc, Agnieszka;  Kjaergaard, Henrik G.;  Kinnison, Douglas;  Jimenez, Jose L.;  Jernigan, Christopher M.;  Hornbrook, Rebecca S.;  Hills, Alan;  Dollner, Maximilian;  Day, Douglas A.;  Cuevas, Carlos A.;  Campuzano-Jost, Pedro;  Burkholder, James;  Bui, T. Paul;  Brune, William H.;  Brown, Steven S.;  Brock, Charles A.;  Bourgeois, Ilann;  Blake, Donald R.;  Apel, Eric C.;  Ryerson, Thomas B.
收藏  |  浏览/下载:23/0  |  提交时间:2020/05/13
dimethyl sulfide  marine sulfur  autoxidation  marine aerosols  aerosol sulfate  
Wintertime spatial distribution of ammonia and its emission sources in the Great Salt Lake region 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2019, 19 (24) : 15691-15709
作者:  Moravek, Alexander;  Murphy, Jennifer G.;  Hrdina, Amy;  Lin, John C.;  Pennell, Christopher;  Franchin, Alessandro;  Middlebrook, Ann M.;  Fibiger, Dorothy L.;  Womack, Caroline C.;  McDuffie, Erin E.;  Martin, Randal;  Moore, Kori;  Baasandorj, Munkhbayar;  Brown, Steven S.
收藏  |  浏览/下载:10/0  |  提交时间:2020/02/17
On the contribution of nocturnal heterogeneous reactive nitrogen chemistry to particulate matter formation during wintertime pollution events in Northern Utah 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2019, 19 (14) : 9287-9308
作者:  McDuffie, Erin E.;  Womack, Caroline C.;  Fibiger, Dorothy L.;  Dube, William P.;  Franchin, Alessandro;  Middlebrook, Ann M.;  Goldberger, Lexie;  Lee, Ben H.;  Thornton, Joel A.;  Moravek, Alexander;  Murphy, Jennifer G.;  Baasandorj, Munkhbayar;  Brown, Steven S.
收藏  |  浏览/下载:14/0  |  提交时间:2019/11/27
Airborne and ground-based observations of ammonium-nitrate-dominated aerosols in a shallow boundary layer during intense winter pollution episodes in northern Utah 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2018, 18 (23) : 17259-17276
作者:  Franchin, Alessandro;  Fibiger, Dorothy L.;  Goldberger, Lexie;  McDuffie, Erin E.;  Moravek, Alexander;  Womack, Caroline C.;  Crosman, Erik T.;  Docherty, Kenneth S.;  Dube, William P.;  Hoch, Sebastian W.;  Lee, Ben H.;  Long, Russell;  Murphy, Jennifer G.;  Thornton, Joel A.;  Brown, Steven S.;  Baasandorj, Munkhbayar;  Middlebrook, Ann M.
收藏  |  浏览/下载:10/0  |  提交时间:2019/04/09
Minimal functional driver gene heterogeneity among untreated metastases 期刊论文
SCIENCE, 2018, 361 (6406) : 1033-1037
作者:  Reiter, Johannes G.;  Makohon-Moore, Alvin P.;  Gerold, Jeffrey M.;  Heyde, Alexander;  Attiyeh, Marc A.;  Kohutek, Zachary A.;  Tokheim, Collin J.;  Brown, Alexia;  DeBlasio, Rayne M.;  Niyazov, Juliana;  Zucker, Amanda;  Karchin, Rachel;  Kinzler, Kenneth W.;  Iacobuzio-Donahue, Christine A.;  Vogelstein, Bert;  Nowak, Martin A.
收藏  |  浏览/下载:14/0  |  提交时间:2019/11/27
Half the story: Thermal effects on within-host infectious disease progression in a warming climate 期刊论文
GLOBAL CHANGE BIOLOGY, 2018, 24 (1) : 371-386
作者:  Stewart, Alexander;  Hablutzel, Pascal I.;  Brown, Martha;  Watson, Hayley V.;  Parker-Norman, Sophie;  Tober, Anya V.;  Thomason, Anna G.;  Friberg, Ida M.;  Cable, Joanne;  Jackson, Joseph A.
收藏  |  浏览/下载:10/0  |  提交时间:2019/04/09
disease  ectothermic  Gasterosteus aculeatus  immunity  infection  parasite  phenology  systems analysis  teleost  vertebrate  
Exploring the impact of energy efficiency as a carbon mitigation strategy in the U.S 期刊论文
ENERGY POLICY, 2017, 109
作者:  Brown, Marilyn A.;  Kim, Gyungwon;  Smith, Alexander M.;  Southworth, Katie
收藏  |  浏览/下载:4/0  |  提交时间:2019/04/09
Energy efficiency  Carbon caps  Climate change  Local air pollutants  CO2 emissions  Greenhouse gases  
Nitrate radicals and biogenic volatile organic compounds: oxidation, mechanisms, and organic aerosol 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2017, 17 (3)
作者:  Ng, Nga Lee;  Brown, Steven S.;  Archibald, Alexander T.;  Atlas, Elliot;  Cohen, Ronald C.;  Crowley, John N.;  Day, Douglas A.;  Donahue, Neil M.;  Fry, Juliane L.;  Fuchs, Hendrik;  Griffin, Robert J.;  Guzman, Marcelo I.;  Herrmann, Hartmut;  Hodzic, Alma;  Iinuma, Yoshiteru;  Jimenez, Jose L.;  Kiendler-Scharr, Astrid;  Lee, Ben H.;  Luecken, Deborah J.;  Mao, Jingqiu;  McLaren, Robert;  Mutzel, Anke;  Osthoff, Hans D.;  Ouyang, Bin;  Picquet-Varrault, Benedicte;  Platt, Ulrich;  Pye, Havala O. T.;  Rudich, Yinon;  Schwantes, Rebecca H.;  Shiraiwa, Manabu;  Stutz, Jochen;  Thornton, Joel A.;  Tilgner, Andreas;  Williams, Brent J.;  Zaveri, Rahul A.
收藏  |  浏览/下载:11/0  |  提交时间:2019/04/09