Follow-up observations of binary ultra-cool dwarfs
Context: Astrometric observations of resolved binaries provide estimates of orbital periods and will eventually lead to measurement of dynamical masses. Only a...
Follow-up observations of extremely metal-poor stars identified from SDSS
Context. The most metal-poor stars in the Milky Way witnessed the early phases of formation of the Galaxy, and have chemical compositions that are close to the...
Follow-up Survey for the Binary Black Hole Merger GW200224_222234 Using Subaru/HSC and GTC/OSIRIS
The LIGO/Virgo detected a gravitational wave (GW) event, named GW200224_222234 (also known as S200224ca) and classified as a binary-black hole coalescence, on...
Forbidden hugs in pandemic times. I. Luminous red nova AT 2019zhd, a new merger in M 31
We present the follow-up campaign of the luminous red nova (LRN) AT 2019zhd, the third event of this class observed in M 31. The object was followed by several...
Forbidden hugs in pandemic times. II. The luminous red nova variety: AT 2020hat and AT 2020kog
We present the results of our monitoring campaigns of the luminous red novae (LRNe) AT 2020hat in NGC 5068 and AT 2020kog in NGC 6106. The two objects were...
Forbidden hugs in pandemic times. IV. Panchromatic evolution of three luminous red novae
We present photometric and spectroscopic data on three extragalactic luminous red novae (LRNe): AT 2018bwo, AT 2021afy, and AT 2021blu. AT 2018bwo was...