Jean-Luc Margot et al 2021 AJ 161 55
A search for technosignatures focused on regions surrounding 31 Sun-like stars near the plane of the galaxy revealed ~26 million signals, of which 99.84% are classified as radio frequency interference.
H.-L. Guo et al 2021 ApJ 906 47
A new a 3D extinction map of the southern sky, covering an area of ~14,000 square degrees, uses the measured extinction for ~19 million stars to provide a view of the 3D distribution of galactic dust grains.
M. Ajello et al 2021 ApJS 252 13
The first Fermi-Large Area Telescope solar flare catalog, covering the 24th solar cycle, contains 45 Fermi-LAT solar flares with emission in the γ-ray energy band detected between 2010 and 2018.
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.