Katrien Kolenberg, KU Leuven & University of Antwerp, Belgium (acrylic paint and chalk pastel on canvas)

Read the May issue online now

This month we feature radio-quiet AGNs, astronomy in South Africa as well as in Portuguese-speaking countries, possible exoplanetary billiards and much more...

Latest Research

  • Letter |

    A systematic change in Jupiter’s magnetic field can be detected by collating all data obtained in the last 45 years by multiple spacecraft, from Pioneer 10 to Juno. Such variation can be attributed to the zonal winds, which advect the magnetic field from the deep atmospheric layers.

    • K. M. Moore
    • , H. Cao
    • , J. Bloxham
    • , D. J. Stevenson
    • , J. E. P. Connerney
    •  & S. J. Bolton
  • Article |

    Leveraging the precision of K2 and TESS, Bowman et al. have detected variability in galactic and Magellanic blue supergiants that is due to low-frequency gravity waves in their interiors.

    • Dominic M. Bowman
    • , Siemen Burssens
    • , May G. Pedersen
    • , Cole Johnston
    • , Conny Aerts
    • , Bram Buysschaert
    • , Mathias Michielsen
    • , Andrew Tkachenko
    • , Tamara M. Rogers
    • , Philipp V. F. Edelmann
    • , Rathish P. Ratnasingam
    • , Sergio Simón-Díaz
    • , Norberto Castro
    • , Ehsan Moravveji
    • , Benjamin J. S. Pope
    • , Timothy R. White
    •  & Peter De Cat
  • Article |

    A predominance of small grains (tens of nanometres in size) over larger grains and the corresponding near- to mid-infrared excess radiation from H ii regions around massive stars and supernovae has been difficult to explain. Hoang et al. propose a radiative torque disruption method for large dust grains that fits with the observational constraints.

    • Thiem Hoang
    • , Le Ngoc Tram
    • , Hyeseung Lee
    •  & Sang-Hyeon Ahn
  • Review Article |

    This article reviews radio emission mechanisms in radio-quiet active galactic nuclei (AGNs), from star formation and AGN winds, to free-free emission from photoionized gas and AGN disk coronal activity. These mechanisms can be probed by sensitive radio observatories.

    • Francesca Panessa
    • , Ranieri Diego Baldi
    • , Ari Laor
    • , Paolo Padovani
    • , Ehud Behar
    •  & Ian McHardy
  • Letter |

    PlanetNet, a new deep learning algorithm, can quickly and accurately map spatial and spectral features across large, heterogeneous areas of a planet. The major components of the 2008 storm on Saturn are delineated, indicating regions to be probed more deeply with radiative transfer models.

    • I. P. Waldmann
    •  & C. A. Griffith

News & Comment

  • Obituary |

    A pioneer of millimetre-wave astronomy, Norio Kaifu was an incomparable leader, person of spirit, colleague and friend.

    • Masahiko Hayashi
  • Editorial |

    The stunning picture of a black hole shadow that was released by the Event Horizon Telescope highlights the power of collaborative projects, as no single person, telescope or nation could have captured such an image.

  • News & Views |

    After 30 years of searching, the helium hydride ion, the first chemical bond that was formed in the Universe, has finally been detected outside the laboratory, in the interstellar medium. It was seen in planetary nebula NGC 7027 using the GREAT spectrometer aboard the Stratospheric Observatory for Infrared Astronomy.

    • Stephen Lepp
  • Mission Control |

    SCExAO is an instrument on the Subaru Telescope that is pushing the frontiers of what is possible with ground-based direct imaging of terrestrial exoplanets, explains Thayne Currie, on behalf of the SCExAO team.

    • Thayne Currie