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Evidence for a large exomoon orbiting Kepler-1625b
Teachey, Alex; Kipping, David M.
Exomoons are the natural satellites of planets orbiting stars outside our solar system, of which there are currently no confirmed examples. We present new observations of a candidate exomoon associated with Kepler-1625b using the Hubble Space Telescope to validate or refute the moon's presence. We find evidence in favor of the moon hypothesis, bas…
Krypton isotopes and noble gas abundances in the coma of comet 67P/Churyumov-Gerasimenko
Mall, Urs; Bar-Nun, Akiva; De Keyser, Johan +24 more
The ROSINA mass spectrometer DFMS on board ESA's Rosetta spacecraft detected the major isotopes of the noble gases argon, krypton, and xenon in the coma of comet 67P/Churyumov-Gerasimenko. Earlier, it has been shown that xenon exhibits an isotopic composition distinct from anywhere else in the solar system. However, argon isotopes, within error, w…
The development of lower-atmosphere turbulence early in a solar flare
Fletcher, L.; Labrosse, N.; Jeffrey, N. L. S. +1 more
We present the first observational study of the onset and evolution of solar flare turbulence in the lower solar atmosphere on an unprecedented time scale of 1.7 s using the Interface Region Imaging Spectrograph observing plasma at a temperature of 80,000 K. At this time resolution, nonthermal spectral line broadening, indicating turbulent velocit…
Einstein@Home discovers a radio-quiet gamma-ray millisecond pulsar
de Palma, Francesco; Fusco, Piergiorgio; Gargano, Fabio +129 more
Millisecond pulsars (MSPs) are old neutron stars that spin hundreds of times per second and appear to pulsate as their emission beams cross our line of sight. To date, radio pulsations have been detected from all rotation-powered MSPs. In an attempt to discover radio-quiet gamma-ray MSPs, we used the aggregated power from the computers of tens of …