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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 eruptions^{1, 2, 3, 4–5}, are garnering further interest in stellar-mass companions a…

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 orbits^{1, 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…