Optical phase curve of the ultra-hot Jupiter WASP-121b
We present the analysis of TESS optical photometry of WASP-121b, which reveals the phase curve of this transiting ultra-hot Jupiter. Its hotspot is located at...
Optical polarimetric monitoring of the type II-plateau SN 2005af
Aims.Core-collapse supernovae may show significant polarization that implies non-spherically symmetric explosions. We observed the type II-plateau SN 2005af...
Optical polarimetric observations of the microquasar LS 5039
We present the first optical polarimetric observations of the runaway microquasar LS 5039. Our results reveal the presence of a large amount (˜5%) of polarized...
We report R band imaging polarimetry of SN 2004bv in NGC 6907 on June 19.299 (UT middle of observation), i.e., two weeks after maximum. We have obtained [ 0.11...
Optical properties of metal-poor T dwarf candidates
Context. Metal-poor brown dwarfs are poorly understood because they are extremely faint and rare. Only a few candidates have been identified as T-type subdwarfs...
Optical properties of Y dwarfs observed with the Gran Telescopio Canarias
Aims: Our science goals are to characterise the optical properties of Y dwarfs and to study their consistency with theoretical models. Methods: A sample of five...
Optical spectroscopy of 4U 1812-12. An ultra-compact X-ray binary seen through an H II region
The persistent low-luminosity neutron star X-ray binary 4U 1812-12 is a potential member of the scarce family of ultra-compact systems. We performed deep...
Optical spectroscopy of blazars for the Cherenkov Telescope Array
Context. Blazars are the most numerous class of high-energy (HE; E ∼ 50 MeV−100 GeV) and very high-energy (VHE; E ∼ 100 GeV−10 TeV) gamma-ray emitters...