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Advanced filters: Author: K. Morzinski Clear advanced filters

  • KBO 55636 (2002 TX300) is one of the Kuiper belt objects — specifically, a member of the water-ice-rich Haumea KBO collisional family. Here, observations are reported of a multi-chord stellar occultation by KBO 55636. Calculations show that KBO 55636 is smaller than previously thought and, like its parent body, is highly reflective. The dynamical age implies either that it has an active resurfacing mechanism, or that fresh water-ice in the outer Solar System can persist for gigayear timescales.

    • J. L. Elliot
    • M. J. Person
    • A. Gilmore
    Research
    Nature
    Volume: 465, P: 897-900

  • Transition disks are natural laboratories for the study of planet formation, with inner clearings explained by the influence of accreting planets, but attempts to observe directly accretion onto protoplanets have proven unsuccessful so far; here the authors detect infrared emission from multiple companions of the LkCa 15 system and Ha emission from the innermost (LkCa 15 b), showing hot (~10,000 K) gas falling deep into the potential well of an accreting protoplanet.

    • S. Sallum
    • K. B. Follette
    • A. J. Weinberger
    Research
    Nature
    Volume: 527, P: 342-344