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Sökning: WFRF:(Greenhill J.) > (2011-2014)

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1.
  • Gould, A., et al. (författare)
  • MOA-2010-BLG-523:" Failed Planet"= RS CVn Star
  • 2013
  • Ingår i: Astrophysical Journal. - 0004-637X. ; 763:2
  • Tidskriftsartikel (refereegranskat)abstract
    • The Galactic bulge source MOA-2010-BLG-523S exhibited short-term deviations from a standard microlensing light curve near the peak of an A(max) similar to 265 high-magnification microlensing event. The deviations originally seemed consistent with expectations for a planetary companion to the principal lens. We combine long-term photometric monitoring with a previously published high-resolution spectrum taken near peak to demonstrate that this is an RS CVn variable, so that planetary microlensing is not required to explain the light-curve deviations. This is the first spectroscopically confirmed RS CVn star discovered in the Galactic bulge.
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2.
  • Bouckaert, Remco, et al. (författare)
  • Mapping the Origins and Expansion of the Indo-European Language Family
  • 2012
  • Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 337:6097, s. 957-960
  • Tidskriftsartikel (refereegranskat)abstract
    • There are two competing hypotheses for the origin of the Indo-European language family. The conventional view places the homeland in the Pontic steppes about 6000 years ago. An alternative hypothesis claims that the languages spread from Anatolia with the expansion of farming 8000 to 9500 years ago. We used Bayesian phylogeographic approaches, together with basic vocabulary data from 103 ancient and contemporary Indo-European languages, to explicitly model the expansion of the family and test these hypotheses. We found decisive support for an Anatolian origin over a steppe origin. Both the inferred timing and root location of the Indo-European language trees fit with an agricultural expansion from Anatolia beginning 8000 to 9500 years ago. These results highlight the critical role that phylogeographic inference can play in resolving debates about human prehistory.
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  • Resultat 1-4 av 4

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