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Read the May issue

This month we present the second part of our Spitzer retrospective, from exoplanets to ultraluminous galaxies to the first galaxies, and more...

Latest Research

  • Article |

    Two sources of variability are reported in extreme horizontal branch (EHB) stars found in globular clusters, both related to the action of weak magnetic fields: large surface spots and very energetic flares. EHB stars in clusters can thus be linked to EHB field stars, and beyond, to other stars with radiative envelopes.

    • Y. Momany
    • , S. Zaggia
    • , M. Montalto
    • , D. Jones
    • , H. M. J. Boffin
    • , S. Cassisi
    • , C. Moni Bidin
    • , M. Gullieuszik
    • , I. Saviane
    • , L. Monaco
    • , E. Mason
    • , L. Girardi
    • , V. D’Orazi
    • , G. Piotto
    • , A. P. Milone
    • , H. Lala
    • , P. B. Stetson
    •  & Y. Beletsky
  • Article |

    Galactic close encounters can induce gravitational effects in the participants. Here Ruiz-Lara et al. have reconstructed the star formation history of the region of our Galaxy close to the Sun, finding that three recent visits of the neighbouring Sagittarius dwarf galaxy have resulted in well-defined episodes of star formation.

    • Tomás Ruiz-Lara
    • , Carme Gallart
    • , Edouard J. Bernard
    •  & Santi Cassisi
  • Article |

    Different plasma modes in various Galactic environments are identified on the basis of a synchrotron polarization analysis. These results open up the study of interstellar turbulence and demonstrate its importance in all relevant processes including cosmic ray transport and star formation.

    • Heshou Zhang
    • , Alexey Chepurnov
    • , Huirong Yan
    • , Kirit Makwana
    • , Reinaldo Santos-Lima
    •  & Sarah Appleby
  • Letter |

    A detailed microphysical model shows that there are two distinct regimes in the aerosol composition of exoplanetary atmospheres: silicates dominate at atmospheric temperatures above 950 K, whereas hydrocarbons prevail for temperatures below 950 K.

    • Peter Gao
    • , Daniel P. Thorngren
    • , Graham K. H. Lee
    • , Jonathan J. Fortney
    • , Caroline V. Morley
    • , Hannah R. Wakeford
    • , Diana K. Powell
    • , Kevin B. Stevenson
    •  & Xi Zhang
  • Article |

    Without an intrinsic magnetic field, Mars’s magnetosphere is induced by direct interaction between its atmosphere and the solar wind. The mapping of the associated current system, obtained by the MAVEN spacecraft, unveils its convective-driven nature and displays various structural differences compared to Earth.

    • Robin Ramstad
    • , David A. Brain
    • , Yaxue Dong
    • , Jared Espley
    • , Jasper Halekas
    •  & Bruce Jakosky

News & Comment

  • Comment |

    eROSITA, a new X-ray telescope currently performing an all-sky survey of unprecedented depth, aims to provide insights into dark energy, dark matter, black holes and perhaps new phenomena that have so far been invisible.

    • Andrea Merloni
    • , Kirpal Nandra
    •  & Peter Predehl
  • Meeting Report |

    Key questions about ice on the red planet, its climate record and its potential for habitability were the subject of the seventh edition of the International Conference on Mars Polar Science and Exploration, held for the first time in the Southern Hemisphere.

    • Patricio Becerra
    • , Isaac B. Smith
    • , Andrea Coronato
    •  & Jorge Rabassa
  • News & Views |

    The discovery of four bright fast radio bursts with accurate localization on the sky and association with nearby galaxies enabled a statistical estimate of the baryon content in the intergalactic medium and intervening galaxy halos by measuring the amount of ionized gas towards these sources.

    • Michael Shull

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