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Non-sinusoidal transit timing variations for the exoplanet HAT-P-12b

Research in Astronomy and Astrophysics 2021年第4期21卷 253-263页

作者： Devesh P.Sanya Ing-Guey Jiang Li-Hsin Su Li-Chin Yeh Tze-En Chang V.V.Moskvin a.a.shlyapnikov V.Ignatov David Mkrtichian Evgeny Griv Vineet Kumar Mannaday Parijat Thakur D.K.Sahu Swadesh Chand D.Bisht Zhao Sun Jianghui Ji Department of Physics and Institute of Astronomy “National Tsing-Hua University”HsinChu 30013China Institute of Computational and Modeling Science “National Tsing-Hua University”HsinChu 30013China Crimean Astrophysical Observatory 298409NauchnyCrimea National Astronomical Research Institute of Thailand(NARIT) Siripanich Building191 Huaykaew RoadMuang DistrictChiangmaiThailand Department of Physics Ben-Gurion UniversityBeer-Sheva 84105Israel Department of Pure&Applied Physics Guru Ghasidas Vishwavidyalaya(A Central University)Bilaspur(C.G.)-495009India Indian Institute of Astrophysics Bangalore 560034India Key Laboratory for Researches in Galaxies and Cosmology University of Science and Technology of ChinaChinese Academy of Sciences Purple Mountain Observatory Chinese Academy of SciencesNanjing 210008China

Considering the importance of investigating the transit timing variations(TTVs)of transiting exoplanets,we present a follow-up study of HAT-P-12 *** include six new light curves observed between2011 and 2015 from three different observatories,in association with 25 light curves taken from the published *** sample of the data used thus covers a time span of~10.2 years with a large coverage of epochs(1160)for the transiting events of the exoplanet HAT-P-12 *** light curves are utilized to determine the orbital parameters and conduct an investigation of possible *** new linear ephemeris shows a large value of reducedχ^(2),i.e.X_(red)^(2)(23)=7.93,and the sinusoidal fitting using the prominent frequency coming from a periodogram shows a reducedχ^(2) around *** on these values and the corresponding O-C diagrams,we suspect the presence of a possible non-sinusoidal TTV in this planetary ***,we find that a scenario with an additional non-transiting exoplanet could explain this TTV with an even smaller reducedχ^(2) value of around 2.

关键词： planetary systems techniques photometric

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Relations between mercury fractions and microbial community components in seawater under the presence and absence of probable phosphorus limitation conditions

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Journal of Environmental Sciences 2019年第1期31卷 145-162页

作者： Igor ?ivkovi? Vesna Fajon Jo?e Kotnik Yaroslav shlyapnikov Kristina Obu Vazner Ermira Begu Stefanija ?estanovi? Danijela ?anti? Ana Vrdoljak Slaven Jozi? Mladen ?oli? Jelena Lu?i? Jere Ve?a Grozdan Ku?pili? Marin Ordulj Frano Mati? Branka Grbec Natalia Bojani? ?ivana Nin?evi? Gladan Milena Horvat Department of Environmental Sciences Jo?ef Stefan Institute Jo?ef Stefan International Postgraduate School Ecological Engineering Institute Maribor 2000 Slovenia Laboratory of Marine Microbiology Institute of Oceanography and FisheriesSplit 21000 Croatia Laboratory of Chemical Oceanography and Sedimentology of the Sea Institute of Oceanography and FisheriesSplit 21000 Croatia Laboratory of Chemical Oceanography and Sedimentology of the Sea Institute of Oceanography and Fisheries Department of Marine Studies University of SplitSplit 21000 Croatia Laboratory of Physical Oceanography Institute of Oceanography and FisheriesSplit 21000 Croatia Laboratory of Plankton and Shellfish Toxicity Institute of Oceanography and FisheriesSplit 21000 Croatia

Microbial transformations of toxic monomethylmercury(MMHg) and dissolved gaseous mercury(DGM) at the lower levels of the marine food web are not well understood, especially in oligotrophic and phosphorus-limited seas. To examine the effects of probable phosphorus limitation(~PP-limitation) on relations between mercury(Hg) fractions and microorganisms, we determined the total mercury(THg), total methylated mercury(MeHg), DGM, and microbiological and chemical parameters in the Central Adriatic Sea. Using statistical analysis, we assessed the potential microbial effects on Hg transformations and bioaccumulation. Only in the absence of ~PP-limitation conditions(^(NO–P)P-limitation) is MeHg significantly related to most chemical and microbial parameters, indicating metabolism-dependent Hg *** heterotrophic activity of low nucleic acid bacteria(abundant in oligotrophic regions)seems responsible for most of Hg methylation under ^(NO–P)P-limitation. Under these conditions,DGM is strongly related to microbial fractions and chlorophyll a, indicating biological DGM production, which is probably not metabolically induced, as most of these relations are also observed underPP-limitation. MMHg biomagnification was observed through an increased bioaccumulation factor from microseston to mesozooplankton. Our results indicate that Hgtransformations and uptake might be enhanced under ^(NO–P)P-limitation conditions, emphasizing their impact on the transfer of Hg to higher trophic levels.

关键词： Mercury speciation Methylmercury Probable phosphorus limitation Microbial community

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