George Vejar et al 2019 ApJ 879 38
Two color–color diagrams show the greatest promise for cleanly separating planetary nebulae from stars, background galaxies, and quasars in future surveys: the r − i versus g − r, and the r − i versus u − g diagrams.
Theron W. Carmichael et al 2019 AJ 158 38
A newly discovered brown dwarf, EPIC 212036875b, falls in the middle of the so-called brown-dwarf desert, suggesting that this is either a rare object or the brown-dwarf desert may not be so dry after all.
Jarrett L. Johnson and Aycin Aykutalp 2019 ApJ 879 18
Models track the chemical and thermal evolution of the primordial gas as it collapses into a massive halo irradiated by a nearby quasar in the lead-up to a massive Pop III starburst.
Quanzhi Ye and David L. Clark 2019 ApJL 878 L34
The small, weakly active comet 289P/Blanpain recently experienced one of the largest comet outburst ever observed, producing 108 kg of dust and providing us with an intriguing target for its 2020 close encounter.
Christopher Spalding 2019 ApJ 879 12
Solar-like tilts of 6° to a star’s spin axis can naturally arise during the first 10–100 Myr after planet formation as a result of stellar winds that deviate by about 10° from the star’s spin axis.
Jan-Torge Schindler et al 2019 ApJS 243 5
Pan-STARRS’s Extremely Luminous Quasar Survey has searched ~21,486 square degrees for the most luminous quasars located at intermediate redshift (z ≥ 2.8), providing a catalog of 592 sources.