Articles

  • Article |

    We calculate the continuous nanohertz gravitational-wave emission from individual supermassive black hole binaries and the gravitational-wave background they generate, which will be observable with pulsar timing arrays.

    • Chiara M. F. Mingarelli
    • , T. Joseph W. Lazio
    • , Alberto Sesana
    • , Jenny E. Greene
    • , Justin A. Ellis
    • , Chung-Pei Ma
    • , Steve Croft
    • , Sarah Burke-Spolaor
    •  & Stephen R. Taylor
  • Article |

    The inner four planets of the TRAPPIST-1 system experienced induction heating due to magnetic interaction with their host star. This led them to experience increased volcanic activity, outgassing and potentially a subsurface magma ocean.

    • K. G. Kislyakova
    • , L. Noack
    • , C. P. Johnstone
    • , V. V. Zaitsev
    • , L. Fossati
    • , H. Lammer
    • , M. L. Khodachenko
    • , P. Odert
    •  & M. Güdel
  • Article |

    Experiments are presented that indicate that methane can be produced abiotically on Mars through the photocatalytic reaction of CO2, in a process called methanogenesis. Methane can then be shocked (through impacts) to form RNA nucleobases and glycine.

    • Svatopluk Civiš
    • , Antonín Knížek
    • , Ondřej Ivanek
    • , Petr Kubelík
    • , Markéta Zukalová
    • , Ladislav Kavan
    •  & Martin Ferus
  • Article |

    By assessing the ionization fraction of the environment around Tycho’s (type Ia) supernova, the authors have constrained the properties of its progenitor enough to rule out a hot, luminous white dwarf. A double white dwarf binary merger is allowed.

    • T. E. Woods
    • , P. Ghavamian
    • , C. Badenes
    •  & M. Gilfanov
  • Article |

    A candidate dual supermassive black hole system with a projected separation of 0.35 pc is found in the gas-rich interacting spiral galaxy NGC 7674, evidenced by a 0.7 kpc Z-shaped radio jet and two, possibly inverted-spectrum, compact radio cores.

    • P. Kharb
    • , D. V. Lal
    •  & D. Merritt
  • Article |

    The authors present a spectrophotometric and hydrodynamical study of supernova OGLE-2014-SN-073, which had remarkably high inferred ejecta mass and energy, potentially higher than can be explained with canonical core-collapse neutrino-driven explosions.

    • G. Terreran
    • , M. L. Pumo
    • , T.-W. Chen
    • , T. J. Moriya
    • , F. Taddia
    • , L. Dessart
    • , L. Zampieri
    • , S. J. Smartt
    • , S. Benetti
    • , C. Inserra
    • , E. Cappellaro
    • , M. Nicholl
    • , M. Fraser
    • , Ł. Wyrzykowski
    • , A. Udalski
    • , D. A. Howell
    • , C. McCully
    • , S. Valenti
    • , G. Dimitriadis
    • , K. Maguire
    • , M. Sullivan
    • , K. W. Smith
    • , O. Yaron
    • , D. R. Young
    • , J. P. Anderson
    • , M. Della Valle
    • , N. Elias-Rosa
    • , A. Gal-Yam
    • , A. Jerkstrand
    • , E. Kankare
    • , A. Pastorello
    • , J. Sollerman
    • , M. Turatto
    • , Z. Kostrzewa-Rutkowska
    • , S. Kozłowski
    • , P. Mróz
    • , M. Pawlak
    • , P. Pietrukowicz
    • , R. Poleski
    • , D. Skowron
    • , J. Skowron
    • , I. Soszyński
    • , M. K. Szymański
    •  & K. Ulaczyk
  • Article |

    A previously unidentified class of variable stars has been found in OGLE survey data, characterized by periodic brightness variations on ~30-min timescales, amplitudes of ~0.3 mag and temperatures of ~30,000 K. They are potentially evolved low-mass stars.

    • Paweł Pietrukowicz
    • , Wojciech A. Dziembowski
    • , Marilyn Latour
    • , Rodolfo Angeloni
    • , Radosław Poleski
    • , Francesco di Mille
    • , Igor Soszyński
    • , Andrzej Udalski
    • , Michał K. Szymański
    • , Łukasz Wyrzykowski
    • , Szymon Kozłowski
    • , Jan Skowron
    • , Dorota Skowron
    • , Przemek Mróz
    • , Michał Pawlak
    •  & Krzysztof Ulaczyk
  • Article |

    Ultrarelativistic photons and neutrinos from gamma-ray bursts offer a testbed for quantum gravity effects that would lead to an energy dependence of the travel times. A statistical analysis of astrophysical data shows that this behaviour may have been observed.

    • Giovanni Amelino-Camelia
    • , Giacomo D’Amico
    • , Giacomo Rosati
    •  & Niccoló Loret
  • Article |

    Using an innovative method, the mass of a pulsar can be constrained using the maximum ‘glitch’ in the star’s rotational frequency: the bigger the glitch, the lower the mass. This method is used to estimate the mass of all observed glitchers.

    • P. M. Pizzochero
    • , M. Antonelli
    • , B. Haskell
    •  & S. Seveso
  • Article |

    The origin of Galactic positrons that produce gamma ray emission when annihilated is still debated. Mergers of two white dwarfs are likely to be the main source of these positrons. Such mergers produce sub-luminous, thermonuclear supernovae.

    • Roland M. Crocker
    • , Ashley J. Ruiter
    • , Ivo R. Seitenzahl
    • , Fiona H. Panther
    • , Stuart Sim
    • , Holger Baumgardt
    • , Anais Möller
    • , David M. Nataf
    • , Lilia Ferrario
    • , J. J. Eldridge
    • , Martin White
    • , Brad E. Tucker
    •  & Felix Aharonian
  • Article |

    The stacking of nearly three-quarters of a million spectra has unearthed a previously unknown component of the Galactic halo: a widely distributed, neutral, excited hydrogen layer that could harbour a sizeable proportion of the Milky Way’s baryons.

    • Huanian Zhang
    •  & Dennis Zaritsky
  • Article |

    Periodic pulsations of polarized emission and a strong magnetic field were found in a white-dwarf double system. These findings confirm a pulsar-like emission mechanism for the system that has so far been associated only with neutron stars.

    • D. A. H. Buckley
    • , P. J. Meintjes
    • , S. B. Potter
    • , T. R. Marsh
    •  & B. T. Gänsicke