We present time-resolved optical spectroscopy of the `redback' binary millisecond pulsar system PSR J1023+0038 during both its radio pulsar (2009) and accretion disc states (2014 and 2016). We provide observational evidence for the companion star being heated during the disc state. We observe a spectral type change along the orbit, from ˜G5 to ˜F6

Overview of the science cases for, and technologies required for a new single dish sub-mm telescope. AtLAST is envisioned as a 50m diameter single dish with a 1deg field of view that will be able to map the large scale structures of the Universe inaccessible to ALMA with mapping speeds 1000s of times faster than current or planned facilities.

We have identified a correlation of increasing albedo for increasing phase-function slope using ground-based and spacecraft observations of 14 Jupiter-family comets (JFCs). This can be interpreted as an evolutionary path of JFCs, according to which dynamically young JFCs start their evolution with relatively high albedos and steeper phase functions

Stellar feedback plays a significant role in modulating star formation, redistributing metals, and shaping the baryonic and dark structure of galaxies - however, the efficiency of its energy deposition to the interstellar medium is challenging to constrain observationally. Here we leverage HST and ALMA imaging of a molecular gas and dust shell (M_{

Brightness variations due to dark spots on the stellar surface encode information about stellar surface rotation and magnetic activity. In this work, we analyze the Kepler long-cadence data of 26,521 main-sequence stars of spectral types M and K in order to measure their surface rotation and photometric activity level. Rotation-period estimates are

Context. Only a few open clusters are as important for the study of stellar and substellar objects, and their formation and evolution, as the young σ Orionis cluster. However, a complete spectroscopic characterisation of its whole stellar population is still missing. Aims: We filled most of that gap with a large spectroscopic and astrometric survey