Feige Wang et al 2021 ApJL 907 L1
The most distant quasar yet discovered, J0313−1806, demonstrates the existence of a supermassive black hole just ~670 million years after the Big Bang, significantly challenging models of black-hole growth.
S. O. Kepler et al 2021 ApJ 906 7
The pulsating hydrogen atmosphere white dwarf star G 117-B15A, observed since 1974, has a stable pulsation period that varies by only 1 second in 6.2 million years, making it an exceptional optical clock.
Eric Agol et al 2021 Planet. Sci. J. 2 1
Fresh analysis of the TRAPPIST-1 exoplanet system using 4 years of transit times from the Spitzer Space Telescope, as well as additional data and simulations, provides new constraints on the properties of the system.
Steve Bryson et al 2021 AJ 161 36
Using the Kepler DR25 planet candidate catalog and Gaia-based stellar properties, the occurrence rate of habitable-zone rocky planets around main sequence stars is estimated as ~0.37–0.88 planets per star.
Roman R. Rafikov 2020 ApJL 905 L35
Calculations show that several of the S stars that orbit extremely close to the supermassive black hole at our galaxy’s center experience relativistic Doppler boosting that increases their photometric variability by more than 6%.
Yongmin Yoon and Gu Lim 2020 ApJ 905 154
An investigation of tidal features in 650 early-type galaxies (ETGs) provides evidence that compact young ETGs — especially those with blue cores — and ETGs with dust lanes are involved in recent mergers.