Tawny Sit and M. K. Ness 2020 ApJ 900 4
The ages and abundances are inferred for 125,367 stars in the Milky Way, including 1,654 bulge stars. Stars in the bulge are about twice as old (~8 Gyr), on average, compared to those in the solar neighborhood.
Brad W. Lyke et al 2020 ApJS 250 8
The 16th (and final) data release of SDSS-IV’s eBOSS survey includes the largest selection of spectroscopically confirmed quasars to date. The catalog contains 750,414 quasars and is estimated to be 99.8% complete.
Kei E. I. Tanaka et al 2020 ApJL 900 L2
ALMA observations of a proto-binary system reveal salt, hot water, and silicon compounds in the individual protostellar disks at ~100 au; these “hot-disk” lines may be common in innermost disks around massive protostars.
Michael F. Heslar et al 2020 Planet. Sci. J. 1 35
Cassini observations of sun glitter reveal rough sea surfaces around Kraken Mare on Titan, indicating wave activity driven by the winds and tidal currents during northern summer on this Saturnian satellite.
Chang Liu et al 2020 ApJ 899 92
Sgr A*, the supermassive black hole in our galaxy’s center, likely had active gas-accretion phases in its past, producing X-ray outbursts that could have significantly enhanced the abundances of some molecular species in our galaxy.
Mariona Badenas-Agusti et al 2020 AJ 160 113
Three sub-Neptune-sized planets have been found transiting the nearby and bright Sun-like star HD 191939, providing a valuable target for follow-up observations to precisely measure the planet masses and atmospheres.