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Millihertz oscillations near the innermost orbit of a supermassive black hole
Ingram, Adam; Fabian, Andrew C.; Remillard, Ronald A. +22 more
Recent discoveries from time-domain surveys are defying our expectations for how matter accretes onto supermassive black holes (SMBHs). The increased rate of short-timescale, repetitive events around SMBHs, including the recently discovered quasi-periodic eruptions1, 2, 3, 4–5, are garnering further interest in stellar-mass companions a…
A pulsar-like polarization angle swing from a nearby fast radio burst
Kilpatrick, Charles D.; Prochaska, J. Xavier; Kaspi, Victoria M. +41 more
Fast radio bursts (FRBs) last for milliseconds and arrive at Earth from cosmological distances. Although their origins and emission mechanisms are unknown, their signals bear similarities with the much less luminous radio emission generated by pulsars within our Miky Way Galaxy1, with properties suggesting neutron star origins2,3
Hydrogen escaping from a pair of exoplanets smaller than Neptune
Schreyer, Ethan; Owen, James E.; Loyd, R. O. Parke +18 more
Exoplanet surveys have shown a class of abundant exoplanets smaller than Neptune on close, <100-day orbits1, 2, 3–4. These planets form two populations separated by a natural division at about 1.8 R⊕ termed the radius valley. It is uncertain whether these populations arose from separate dry versus water-rich formation chan…