L. G. Bouma et al 2019 AJ 157 217
TESS observations of the hot Jupiter WASP-4b show that its transits occur 81.6 ± 11.7 s earlier than predicted, suggesting this planet’s 1.3-day period is decreasing at a rate of –12.6 ms per year.
J. A. Mattias Green et al 2019 ApJL 876 L22
Numerical modeling of solar tides in a theoretical ancient ocean on Venus suggest that such tides could have had significant effects on the rotational history of the planet.
Benjamin C. Bromley and Scott J. Kenyon 2019 ApJ 876 17
A magnetic star can drive ohmic heating of a conducting planetary object; if trapped by an insulating crust or mantle, this heat can raise internal temperatures of asteroids or dwarf planets and cause volcanic ejections.
Qicheng Zhang et al 2019 AJ 157 201
Threatening comets may be deflected via artificial heating (e.g., by a laser) that causes sublimation jets to change the comet’s course. Strategies must also be employed to avoid comet fragmentation during deflection.
Nobuyuki Sakai et al 2019 ApJ 876 30
Methanol masers in the outer regions of the Perseus arm reveal motions consistent with models for spiral arm formation that involve gas entering an arm to be shocked and then to form stars.
Prabal Saxena et al 2019 ApJL 876 L16
The observed degree of depletion of sodium and potassium in lunar samples and the evolution of activity of solar analogs over time suggest that the primordial Sun is highly likely to have been a slow rotator.