Bruce G. Elmegreen and Debra Meloy Elmegreen 2019 ApJS 245 14

Spitzer Space Telescope observations of 15 spiral galaxies show numerous dense cores at 8 μm that, with a possible age between 0.2 and 2 Myr, likely represent the earliest phase for most star formation in these galaxies.

Sebastien Guillot et al 2019 ApJL 887 L27

NICER observations show X-ray pulsations in five new millisecond pulsars, providing promising future targets to constrain the neutron star mass–radius relation and the dense matter equation of state.

Mikkel N. Lund et al 2019 AJ 158 248

Asteroseismic characterization of K2-93, a star that hosts five planets from sub-Neptune to Jupiter size, constrains the stellar parameters and the orbital periods of the outer planets.

Carolin Wittmann et al 2019 ApJS 245 10

A catalog of 5,437 morphologically classified sources is presented in the direction of the Perseus galaxy cluster core — among them 496 early-type low-mass galaxy candidates.

K. Hagiwara et al 2019 ApJL 887 L6

A search for GeV to TeV neutrinos from blazar TXS 0506+056 by the Super-Kamiokande detector found no excess, despite the 2017 detection of a 290 TeV neutrino event from this direction by IceCube.

Apurva V. Oza et al 2019 ApJ 885 168

Though exomoons are usually too small to detect, observations of sodium and potassium gas in hot Jupiter atmospheres could be a signature of the geological activity venting from an otherwise hidden exo-Io.