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Nightside condensation of iron in an ultrahot giant exoplanet 期刊论文
NATURE, 2020, 580 (7805) : 597-+
作者:  Lu, Zhihao;  Zou, Jianling;  Li, Shuang;  Topper, Michael J.;  Tao, Yong;  Zhang, Hao;  Jiao, Xi;  Xie, Wenbing;  Kong, Xiangqian;  Vaz, Michelle;  Li, Huili;  Cai, Yi;  Xia, Limin;  Huang, Peng;  Rodgers, Kristen;  Lee, Beverly;  Riemer, Joanne B.;  Day, Chi-Ping;  Yen, Ray-Whay Chiu;  Cui, Ying;  Wang, Yujiao;  Wang, Yanni;  Zhang, Weiqiang;  Easwaran, Hariharan;  Hulbert, Alicia;  Kim, KiBem;  Juergens, Rosalyn A.;  Yang, Stephen C.;  Battafarano, Richard J.;  Bush, Errol L.;  Broderick, Stephen R.;  Cattaneo, Stephen M.;  Brahmer, Julie R.;  Rudin, Charles M.;  Wrangle, John;  Mei, Yuping;  Kim, Young J.;  Zhang, Bin;  Wang, Ken Kang-Hsin;  Forde, Patrick M.;  Margolick, Joseph B.;  Nelkin, Barry D.;  Zahnow, Cynthia A.;  Pardoll, Drew M.;  Housseau, Franck;  Baylin, Stephen B.;  Shen, Lin;  Brock, Malcolm V.
收藏  |  浏览/下载:98/0  |  提交时间:2020/07/03

Ultrahot giant exoplanets receive thousands of times Earth'  s insolation(1,2). Their high-temperature atmospheres (greater than 2,000 kelvin) are ideal laboratories for studying extreme planetary climates and chemistry(3-5). Daysides are predicted to be cloud-free, dominated by atomic species(6) and much hotter than nightsides(5,7,8). Atoms are expected to recombine into molecules over the nightside(9), resulting in different day and night chemistries. Although metallic elements and a large temperature contrast have been observed(10-14), no chemical gradient has been measured across the surface of such an exoplanet. Different atmospheric chemistry between the day-to-night ('  evening'  ) and night-to-day ('  morning'  ) terminators could, however, be revealed as an asymmetric absorption signature during transit(4,7,15). Here we report the detection of an asymmetric atmospheric signature in the ultrahot exoplanet WASP-76b. We spectrally and temporally resolve this signature using a combination of high-dispersion spectroscopy with a large photon-collecting area. The absorption signal, attributed to neutral iron, is blueshifted by -11 +/- 0.7 kilometres per second on the trailing limb, which can be explained by a combination of planetary rotation and wind blowing from the hot dayside(16). In contrast, no signal arises from the nightside close to the morning terminator, showing that atomic iron is not absorbing starlight there. We conclude that iron must therefore condense during its journey across the nightside.


Absorption lines of iron in the dayside atmosphere of an ultrahot giant exoplanet disappear after travelling across the nightside, showing that the iron has condensed during its travel.


  
Marine Boundary Layer Clouds Associated with Coastally Trapped Disturbances: Observations and Model Simulations 期刊论文
JOURNAL OF THE ATMOSPHERIC SCIENCES, 2019, 76 (9) : 2963-2993
作者:  Juliano, Timothy W.;  Coggon, Matthew M.;  Thompson, Gregory;  Rahn, David A.;  Seinfeld, John H.;  Sorooshian, Armin;  Lebo, Zachary J.
收藏  |  浏览/下载:28/0  |  提交时间:2019/11/27
North Pacific Ocean  Marine boundary layer  Stratiform clouds  Cloud parameterizations  Numerical analysis  modeling  Marine chemistry  
A Mesocosm Double Feature: Insights into the Chemical Makeup of Marine Ice Nucleating Particles 期刊论文
JOURNAL OF THE ATMOSPHERIC SCIENCES, 2018, 75 (7) : 2405-2423
作者:  McCluskey, Christina S.;  Hill, Thomas C. J.;  Sultana, Camille M.;  Laskina, Olga;  Trueblood, Jonathan;  Santander, Mitchell V.;  Beall, Charlotte M.;  Michaud, Jennifer M.;  Kreidenweis, Sonia M.;  Prather, Kimberly A.;  Grassian, Vicki;  DeMott, Paul J.
收藏  |  浏览/下载:41/0  |  提交时间:2019/04/09
Chemistry  atmospheric  Aerosol indirect effect  Aerosol-cloud interaction  Marine chemistry  
ESM'2017 - 31st European Simulation and Modelling Conference 会议
Lisbon, Portugal, 会议类型: Conference, 2017