Jeremy Darling 2020 ApJL 900 L28
The presence of strong magnetic fields causes conversions of axions to photons; this is used to provide new constraints on axionic dark matter based on observations of the spectrum of magnetar PSR J1745−2900.
Stephen R. Kane et al 2020 Planet. Sci. J. 1 36
Modeling indicates that LHS 3844b, a 1.3-Earth-radius planet with no significant atmosphere in a 0.46-day orbit around an M dwarf, likely has a volatile poor composition and formed interior to the system snow line.
Juan P. Farias et al 2020 ApJ 900 14
A series of tests are used on Gaia DR2 data to identify runaway/walkaway stars from the Orion Nebula Cluster. 25 ejection candidates are found, including 10 that satisfy the strictest 3D traceback conditions.
Samson A. Johnson et al 2020 AJ 160 123
New models predicts that the Nancy Grace Roman Space Telescope will, through the use of gravitational microlensing, detect around 250 free-floating planets with masses down to that of Mars.
Takaaki Tanaka et al 2020 ApJL 900 L5
Chandra X-ray observations of the supernova remnant RX J1713.7−3946 reveal that its forward shock is colliding with the dense surrounding gas of the interstellar medium, rapidly accelerating particles in the collision region.
Tawny Sit and M. K. Ness 2020 ApJ 900 4
The ages and abundances are inferred for 125,367 stars in the Milky Way, including 1,654 bulge stars. Stars in the bulge are about twice as old (~8 Gyr), on average, compared to those in the solar neighborhood.