Stephanie H. Ho et al 2019 ApJ 875 54
Cosmological hydrodynamic simulations suggest that cold gas accretes onto galaxies anisotropically and it can plausibly account for sustaining the star-forming activities of many galaxies.
David V. Martin et al 2019 ApJL 875 L25
Calculations suggest that a Neptune-sized exomoon candidate in the Kepler-1625 system may only transit ~40% of the time, suggesting ~6 non-transits would be required to confidently rule out the moon’s existence.
William Janesh et al 2019 AJ 157 183
Imaging of 23 ultracompact high-velocity clouds has revealed five objects that are likely stellar counterparts, suggesting that five of these clouds are dwarf galaxies in or near the Local Group.
Yan-Rong Li et al 2019 ApJS 241 33
Optical monitoring of Ark 120, a nearby radio-quiet active galactic nucleus, reveals a 20-year periodicity that potentially indicates this galaxy hosts a sub-parsec supermassive black hole binary.
Sebastien Guillot et al 2019 ApJ 874 175
Hubble Space Telescope observations of the ~3 × 108-year-old, slow, isolated, rotation-powered pulsar PSR J2144–3933 yield no detection — indicating that, at T < 42,000 K, this is the coldest known neutron star.
Diana Dragomir et al 2019 ApJL 875 L7
TESS’s recent discoveries include HD 21749b, a sub-Neptune in a 36 day orbit around a bright and nearby K dwarf, and HD 21749c, the first Earth-size (R ~ 0.89 Earth radii) planet that TESS has found.