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Diversity of Protists I01:15

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Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
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Diversity of Protists III01:27

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Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
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Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
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In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. He formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe.
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In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. His first law states that all planets orbit the Sun in an elliptical orbit, with the Sun at one of the ellipse's foci. Therefore, the distance of a planet from the Sun varies throughout its revolution around the Sun.
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Bringing the Visible Universe into Focus with Robo-AO
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Exploring the diversity of Jupiter-class planets.

Leigh N Fletcher1, Patrick G J Irwin, Joanna K Barstow

  • 1Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, , Clarendon Laboratory, Parks Road, Oxford OX1 3PU, UK.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
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PubMed
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Giant exoplanets exhibit diverse atmospheric conditions, from cool to irradiated

Keywords:
Jupiterclassification systemsexoplanets

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Area of Science:

  • Exoplanetary science
  • Atmospheric physics and chemistry
  • Astrophysical object classification

Background:

  • Over 900 exoplanets have been discovered, with a significant fraction being gas giants more massive than Saturn or Jupiter.
  • The term 'hot Jupiter' inadequately describes the wide range of giant planets, from cool to highly irradiated.
  • Neptune-sized planets may constitute the majority of the planetary population when Kepler candidates are included.

Purpose of the Study:

  • To review theoretical expectations for Jupiter-class exoplanet atmospheres under various conditions.
  • To discuss existing and proposed classification schemes for giant exoplanets.
  • To explore the implications for our Solar System's giant planets and the challenges in exoplanetary spectroscopy.

Main Methods:

  • Review of theoretical models for exoplanet temperatures, molecular composition, and cloud properties.
  • Analysis of factors influencing atmospheric conditions: thermochemical equilibrium, metallicity, formation mechanisms, optical absorbers, photochemistry, vertical mixing, and energy redistribution.
  • Discussion of retrieval techniques for atmospheric characterization and future spectroscopic requirements.

Main Results:

  • Giant exoplanets exist on a continuum, challenging simple classifications like 'hot Jupiter'.
  • Atmospheric properties are influenced by a complex interplay of factors including irradiation, composition, and atmospheric dynamics.
  • Current understanding highlights the need for detailed spectroscopic analysis to accurately classify and understand these diverse objects.

Conclusions:

  • A comprehensive understanding of Jupiter-class exoplanets requires considering a wide range of physical and chemical processes.
  • Existing classification schemes have limitations, especially at the current stage of exoplanetary spectroscopy.
  • Future spectroscopic characterization is crucial for testing theoretical models and advancing our knowledge of giant exoplanet atmospheres.