Compact astrophysical objects

  • Article
    | Open Access

    Evolution of accretion disk and corona during outbursts in black hole binary systems is still unclear. Here, the authors show spectral analysis of MAXI J1820+070 and propose a scenario of a dynamical corona to explain the evolution of the reflection fraction observed by Insight-HXMT.

    • Bei You
    • , Yuoli Tuo
    •  & Yue Zhu
  • Article
    | Open Access

    The location of energy dissipation in powerful extragalactic jets is currently unknown. Here, the authors show that the more distant molecular torus is the dominant location for powerful jets using a diagnostic called the seed factor which is dependent only on observable quantities.

    • Adam Leah W. Harvey
    • , Markos Georganopoulos
    •  & Eileen T. Meyer
  • Article
    | Open Access

    Independently measuring the tidal deformability and the fundamental oscillation mode (fmode) frequency enables tests of gravity and the nature of compact binaries. Here, the authors constrain the f-mode frequencies of the companions of GW170817 from direct measurements, demonstrating gravitational wave asteroseismology with binary inspiral signals alone.

    • Geraint Pratten
    • , Patricia Schmidt
    •  & Tanja Hinderer
  • Article
    | Open Access

    Interstellar magnetic fields determined from pulsar polarimetry in the GHz-band may be biased by mechanical-optical rotation in pulsars’ magnetospheres. Here the authors show how observations at sub-GHz frequencies can be used to resolve such a bias and determine pulsar rotation directions.

    • Renaud Gueroult
    • , Yuan Shi
    •  & Nathaniel J. Fisch
  • Article
    | Open Access

    A faint gamma-ray burst (GRB 170817A) has been recently detected in coincidence with the gravitational wave (GW) event GW 170817. Here, the authors report that another faint short GRB at a cosmological distance (GRB150101B) and its late time emission are analogous to the neutron star merger event GRB 170817A.

    • E. Troja
    • , G. Ryan
    •  & S. Veilleux