Sarah Blunt et al 2019 AJ 158 181
Two decades of radial velocity observations are used to detect a planet of at least 3 Jupiter masses on a highly eccentric (e ~ 0.84) orbit with a period of ~74 years around the star HD 120066.
Thomas W.-S. Holoien et al 2019 ApJ 883 111
TESS’s first discovery of a tidal disruption event (TDE), ASASSN-19bt, includes detailed observations from before its rise. The combined data set for ASASSN-19bt is the most detailed pre-peak data set for any TDE.
Kohei Ichikawa et al 2019 ApJL 883 L13
NuSTAR X-ray observation of the nearby galaxy Arp 187 reveal a luminosity decline of this AGN by more than a factor of 1,000, suggesting this is a “dead” quasar that’s currently quiet but had high past activity.
F. Annibali et al 2019 ApJ 883 19
New Hubble imaging of a stream-like system associated with the dwarf galaxy DDO 68 resolves individual stars within the stream, confirming this striking example of hierarchical merging in action at dwarf-galaxy scales.
Jennifer G. Winters et al 2019 AJ 158 152
Recent TESS data has revealed LTT 1445Ab, the second nearest transiting exoplanet system found to date, which consists of a planet orbiting a star in a system of three mid-to-late M dwarfs in a hierarchical configuration.
Ethan Kruse et al 2019 ApJS 244 11
Application of a new search algorithm to the K2 Kepler mission extension data reveal 818 transiting planet candidates — of which 374 were undiscovered by prior searches — and 579 eclipsing binary systems.