Megan E. Schwamb et al 2019 ApJS 243 12
Early results from Col-OSSOS, which is acquiring g, r, and J photometry of 100 trans-Neptunian objects, suggest that the primordial solar system protoplanetesimal disk is neutral-class rather than red-class dominated.
B. Militzer et al 2019 ApJ 879 78
New computational modeling methods predict a dense central core of ~15–18 Earth masses for Saturn, an additional 1.5–5 Earth masses of heavy elements in the envelope, and a rotation period of 10:33:34 hr ± 55 s.
Kazuhiro D. Kanagawa 2019 ApJL 879 L19
Hydrodynamic simulations reveal that when a planet opens a gap in a protoplanetary disk, dust feedback can reduce the surface density at the outer edge of the gap, terminating inward migration of the planet.
Jura Borissova et al 2019 AJ 158 46
A combination of near-infrared photometry, spectroscopy, and astrometry has revealed 29 OB type, Wolf–Rayet, and emission-line stars in the nearby star-forming complex G305 — 18 of which are newly classified.
Bernd Husemann et al 2019 ApJ 879 75
VLT-MUSE and ALMA observations of the extended narrow-line region and molecular gas around quasar 3C 273 suggest a jet-driven, expanding hot gas cocoon is impacting on an inclined gas disk, driving complex motions.
Bill Paxton et al 2019 ApJS 243 10
Updates to the MESA software instrument include functionality for modeling nonlinear pulsations of variable stars, enhanced numerical energy conservation capabilities, and improvements for modeling rotating stars.