Arieh Königl et al 2017 ApJL 846 L13
Dynamically isolated, Earth-size planets with orbital periods of ~1 day could represent the remnant rocky cores of giant planets that arrived at the stellar vicinity on high-eccentricity orbits.
Maosheng Xiang et al 2017 ApJS 232 2
The large data set of galactic-disk stellar ages and masses from LAMOST suggest that the Milky Way’s thin disk became prominent 8–10 Gyr ago, while the thick disk formed earlier and was almost quenched 8 Gyr ago.
A. Cherenkov et al 2017 ApJ 846 31
Over the course of 1 Gyr, the mass lost by a hot Jupiter due to impacts of CMEs from the host star is comparable to the mass lost due to high-energy stellar irradiation.
Andrés E. Piatti 2017 ApJL 846 L10
A stellar density profile of 47 Tucanae out to ~5.5 times its tidal radius reveals that this globular cluster’s envelope is a halo-like, nearly constant low-density structure.
Steven R. Majewski et al 2017 AJ 154 94
APOGEE, part of SDSS-III, has completed its systematic, homogeneous spectroscopic survey sampling all major populations of the Milky Way, gathering half a million high-resolution infrared spectra for 146,000 stars.
G. B. Lansbury et al 2017 ApJ 846 20
Eight NuSTAR sources with extremely hard X-ray spectra are identified as highly obscured active galactic nuclei, including three robust Compton-thick AGN at low redshift and one likely one at higher redshift.