Publications

  • Spectrophotometric Properties of 162173 Ryugu's Surface from the NIRS3 Opposition Observations

    Examination of the opposition geometry properties show that Ryugu's surface regolith is commensurate with laboratory studies of the photometric behavior of powdered carbonaceous chondrites. The regolith is consistent with a broad grain size distribution that contains a fine-grained component.

    Domingue, Deborah et al.

    Advertised on:

    10
    2021
  • Uncovering fossils of the distant Milky Way with UNIONS: NGC 5466 and its stellar stream

    We examine the spatial clustering of blue horizontal branch (BHB) stars from the u-band of the Canada-France Imaging Survey (CFIS, a component of the Ultraviolet Near-Infrared Optical Northern Survey, or UNIONS). All major groupings of stars are associated with previously known satellites, and among these is NGC 5466, a distant (16 kpc) globular

    Jensen, Jaclyn et al.

    Advertised on:

    10
    2021
  • High-resolution observations of bright boulders on asteroid Ryugu: 1. Size frequency distribution and morphology

    The near-Earth asteroid (162173) Ryugu displays a Cb-type average spectrum and a very low average normal albedo of 0.04. Although the majority of boulders on Ryugu have reflectance spectra and albedo similar to the Ryugu average, a small fraction of boulders exhibit anomalously high albedo and distinctively different spectra. A previous study

    Sugimoto, Chiho et al.

    Advertised on:

    11
    2021
  • High-resolution observations of bright boulders on asteroid Ryugu: 2. Spectral properties

    Many small boulders with reflectance values higher than 1.5 times the average reflectance have been found on the near-Earth asteroid 162,173 Ryugu. Based on their visible wavelength spectral differences, Tatsumi et al. (2021, Nature Astronomy, 5, doi:10.1038/s41550-020-1179-z) defined two bright boulder classes: C-type and S-type. These two

    Sugimoto, Chiho et al.

    Advertised on:

    11
    2021
  • Geologic History and Crater Morphology of Asteroid (162173) Ryugu

    Crater morphology and surface age of asteroid (162173) Ryugu are characterized using the high-resolution images obtained by the Hayabusa2 spacecraft. Our observations reveal that the abundant boulders on and under the surface of the rubble-pile asteroid affect crater morphology. Most of the craters on Ryugu exhibit well-defined circular depressions

    Cho, Y. et al.

    Advertised on:

    8
    2021
  • Implications of new evidence for lepton-universality violation in b →s <SUP>ℓ+</SUP><SUP>ℓ-</SUP> decays

    Motivated by renewed evidence for new physics in b →s ℓℓ transitions in the form of LHCb's new measurements of theoretically clean lepton-universality ratios and the purely leptonic Bs→μ+μ- decay, we quantify the combined level of discrepancy with the Standard Model and fit values of short-distance Wilson coefficients. A combination of the clean

    Geng, Li-Sheng et al.

    Advertised on:

    8
    2021