Publications

  • An Isolated Mass-gap Black Hole or Neutron Star Detected with Astrometric Microlensing

    We present the analysis of five black hole candidates identified from gravitational microlensing surveys. Hubble Space Telescope astrometric data and densely sampled light curves from ground-based microlensing surveys are fit with a single-source, single-lens microlensing model in order to measure the mass and luminosity of each lens and determine

    Lam, Casey Y. et al.

    Advertised on:

    7
    2022
  • Detection of Flare-induced Plasma Flows in the Corona of EV Lac with X-Ray Spectroscopy

    Stellar flares are characterized by sudden enhancement of electromagnetic radiation from the atmospheres of stars. Compared to their solar counterparts, our knowledge on the coronal plasma dynamics of stellar flares and their connection to coronal mass ejections remains very limited. With time-resolved high-resolution spectroscopic observations

    Chen, Hechao et al.

    Advertised on:

    7
    2022
  • The CARMENES search for exoplanets around M dwarfs. Two Saturn-mass planets orbiting active stars

    The CARMENES radial-velocity survey is currently searching for planets in a sample of 387 M dwarfs. Here we report on two Saturn-mass planets orbiting TYC 2187-512-1 (M* = 0.50 M⊙) and TZ Ari (M* = 0.15 M⊙), respectively. We obtained supplementary photometric time series, which we use along with spectroscopic information to determine the rotation

    Quirrenbach, A. et al.

    Advertised on:

    7
    2022
  • Puzzling large-scale polarization in the galaxy cluster Abell 523

    Large-scale magnetic fields reveal themselves through diffuse synchrotron sources observed in galaxy clusters such as radio halos. Total intensity filaments of these sources have been observed in polarization as well, but only in three radio halos out of about 100 currently known. In this paper we analyse new polarimetric Very Large Array data of

    Vacca, Valentina et al.

    Advertised on:

    8
    2022
  • The black hole population in low-mass galaxies in large-scale cosmological simulations

    Recent systematic searches for massive black holes (BHs) in local dwarf galaxies led to the discovery of a population of faint active galactic nuclei (AGNs). We investigate the agreement of the BH and AGN populations in the Illustris, TNG, Horizon-AGN, EAGLE, and SIMBA simulations with current observational constraints in low-mass galaxies. We find

    Haidar, Houda et al.

    Advertised on:

    8
    2022
  • TOI-2119: a transiting brown dwarf orbiting an active M-dwarf from NASA's TESS mission

    We report the discovery of TOI-2119b, a transiting brown dwarf (BD) that orbits and is completely eclipsed by an active M-dwarf star. Using light-curve data from the Transiting Exoplanet Survey Satellite mission and follow-up high-resolution Doppler spectroscopic observations, we find the BD has a radius of Rb = 1.08 ± 0.03RJ, a mass of Mb = 64.4 ±

    Carmichael, Theron W. et al.

    Advertised on:

    8
    2022