Search Publications
Piercing the dusty veil of hyper-luminous infrared galaxies: Sub-arcsecond 144 MHz ILT observations of HLIRGs in the Lockman Hole
Bondi, M.; Prandoni, I.; Małek, K. +10 more
Context. Hyper-luminous infrared galaxies (HLIRGs) are among the most extreme systems in the Universe. With infrared (IR) luminosities of LIR > 1013 L⊙ they can have IR-derived star formation rates (SFRs) exceeding 103 M⊙ yr−1. Theoretical models have a hard time reproducing the …
Constraints on planetary tidal dissipation from a detailed study of Kepler 91b
Buldgen, G.; Eggenberger, P.; Bolmont, E. +2 more
Context. With the detection of thousands of exoplanets, characterising their dynamical evolution in detail represents a key step in the understanding of their formation. Studying the dissipation of tides occurring both in the host star and in the planets is of great relevance in order to investigate the distribution of the angular momentum occurri…
Magnetic field fluctuations in the shocked umbral chromosphere
Asensio Ramos, A.; González Manrique, S. J.; Felipe, T. +1 more
Context. Umbral chromospheric observations show the presence of magnetoacoustic shocks. Several recent studies have reported magnetic field fluctuations associated with these shock waves. The mechanism behind these periodic magnetic field changes is still an unresolved question.
Aims: We aim to study the properties and origin of magnetic fiel…
TOI-733 b: A planet in the small-planet radius valley orbiting a Sun-like star
Vanderburg, Andrew; Latham, David W.; Cochran, William D. +40 more
We report the discovery of a hot (Teq ≈ 1055 K) planet in the small-planet radius valley that transits the Sun-like star TOI-733. It was discovered as part of the KESPRINT follow-up program of TESS planets carried out with the HARPS spectrograph. TESS photometry from sectors 9 and 36 yields an orbital period of {P{{orb}}} = 4…
Discovery of the lensed quasar eRASS1 J050129.5−073309 with SRG/eROSITA and Gaia
Schramm, Malte; Schwope, Axel; Bulbul, Esra +9 more
We report the discovery and spectroscopic identification of the bright doubly lensed quasar eRASS1 J050129.5−073309 at redshift z = 2.47, selected from the first all-sky survey of the Spectrum Roentgen Gamma (SRG) eROSITA telescope and the Gaia EDR3 catalog. We systematically searched for extragalactic sources with eROSITA X-ray positions that hav…
How much large dust could be present in hot exozodiacal dust systems?
Krivov, A. V.; Ertel, S.; Wolf, S. +3 more
Context. An infrared excess over the stellar photospheric emission of main-sequence stars has been found in interferometric surveys, commonly attributed to the presence of hot exozodiacal dust (HEZD). While submicrometer-sized grains in close vicinity to their host star have been inferred to be responsible for the found near-infrared excesses, the…
Carte du Ciel and Gaia. I. Astrometry
Prusti, T.; Ness, J. -U.; Muinonen, K. +7 more
Context. The Carte du Ciel archive at the University of Helsinki enables us to see the sky as it was about 120 yr ago. The archive consists of single-exposure and triple-exposure plates between epochs 1896.8-1925.8.
Aims: Our main aim is to find binary and multiple stars by combining Carte du Ciel and Gaia data.
Methods: The plates were …
From binary to singular: The AGN PSO J334.2028+1.4075 under the high-resolution scope
Gurvits, L. I.; Ros, E.; An, T. +6 more
Context. PSO J334.2028+1.4075 (PSO J334) is a luminous quasar located at redshift z = 2.06. The source gained attention when periodic flux density variations were discovered in its optical light curve. These variations were initially interpreted as the variability due to the orbital motion of a supermassive black hole binary (SMBHB) residing in a …
The rotation period distribution in the young open cluster NGC 6709
Granzer, T.; Barnes, S. A.; Weingrill, J. +1 more
Open clusters serve as a useful tool for calibrating models of the relationship between mass, rotation, and age for stars with an outer convection zone due to the homogeneity of the stars within the cluster. Cluster-to-cluster comparisons are essential to determine whether the universality of spin-down relations holds.
The HARPS search for southern extra-solar planets. XLVII. Five Jupiter-mass planets in long-period orbits, one highly irradiated Neptune, one brown dwarf, and five stellar binaries
Bouchy, F.; Moutou, C.; Queloz, D. +10 more
Context. The long-term ongoing HARPS radial velocity survey of extra-solar planets initiated in 2003 provides a unique data set with a 19-yr baseline that allows the detection of long-period exoplanets, brown dwarfs, and low-mass binaries.
Aims: Our aim is to detect and characterise long-period companions around main sequence stars (spectral …