Rayna Rampalli et al 2019 AJ 158 62
The long-running search for a giant transiting planet in an open cluster remains fruitless after a recent candidate, a hot Saturn orbiting the late F star K2-308, is shown to not belong to the open cluster NGC 1817 after all.
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.