Reto Trappitsch et al 2018 ApJL 857 L15
Isotopic analyses of a chondrule from the primitive meteorite Semarkona suggest that supernova injection of 60Fe into the early solar system is not necessary to account for the measured solar system’s initial amount of 60Fe.
Johnny P. Greco et al 2018 ApJ 857 104
Extended low-surface-brightness objects identified in the Hyper Suprime-Cam Subaru survey are diverse, ranginig from dwarf spheroidals and ultradiffuse galaxies in nearby groups, to gas-rich irregulars, to giant spirals.
H.-W. Kim et al 2018 AJ 155 186
The Korea Microlensing Telescope Network light curves for microlensing-event candidates in the Kepler K2 C9 field are released for use with observations from Kepler, which functions as a microlens parallax satellite.
Zaven Arzoumanian et al 2018 ApJS 235 37
High-precision timing data for 45 millisecond pulsars observed over 11 years provide new parallax, Shapiro-delay, and orbital-period-variation measurements, as well as constraints on the gravitational-wave background.
Andrew McNeill et al 2018 ApJL 857 L1
The interstellar asteroid 1I/’Oumuamua is found to have a density range 1500 < ρ < 2800 kg/m3, which requires no significant cohesive strength to hold together. The authors estimate its aspect ratio at 6 ± 1:1.
Nikolaos Georgakarakos et al 2018 ApJ 856 155
A study of 147 planetary systems suggests that the presence of “giant neighbors” can reduce a terrestrial planet’s chances to remain habitable, but they can also occasionally increase the extent of habitable zones.