Search Publications
Radio continuum and OH line emission of high-z OH megamaser galaxies
Zhu, Ming; Jiang, Peng; Zhang, Bo +8 more
We present a study of the arcsecond-scale radio continuum and OH line emission of a sample of known OH megamaser (OHM) galaxies with z ≥ 0.15 using archival Very Large Array (VLA) data and also the results of our pilot Five-hundred-meter Aperture Spherical radio Telescope (FAST) observations of 12 of these OHM galaxies. The arcsecond-scale resolut…
Orbital parallax of binary systems compared to Gaia DR3 and the parallax zero-point offset at bright magnitudes
Groenewegen, M. A. T.
Multiple systems for which the astrometric and spectroscopic orbit are known offer the unique possibility of determining the distance to these systems directly without any assumptions. They are therefore ideal objects for a comparison of Gaia data release 3 (GDR3) parallax data, especially since GDR3 presents the results of the non-single star (NS…
The galaxy counterpart and environment of the dusty damped Lyman-α absorber at z = 2.226 towards Q 1218+0832
Östlin, G.; Milvang-Jensen, B.; Fynbo, J. P. U. +8 more
We report on further observations of the field of the quasar Q 1218+0832. Geier et al. (2019, A&A, 625, L9) presented the discovery of the quasar resulting from a search for quasars reddened and dimmed by dust in foreground damped Lyman-α absorbers (DLAs). The DLA is remarkable by having a very large H I column density close to 1022…
Photometric follow-up of the 20 Myr old multi-planet host star V1298 Tau with CHEOPS and ground-based telescopes
Béjar, V. J. S.; Zapatero Osorio, M. R.; Scandariato, G. +25 more
Context. The 20 Myr old star V1298 Tau hosts at least four planets. Since its discovery, this system has been a target of intensive photometric and spectroscopic monitoring. To date, the characterisation of its architecture and planets' fundamental properties has been very challenging.
Aims: The determination of the orbital ephemeris of the o…
Dark dust. III. The high-quality single-cloud reddening curve sample: Scrutinizing extinction curves in the Milky Way
Krełowski, J.; Siebenmorgen, R.; Chini, Rolf +2 more
The nature of dust in the diffuse interstellar medium can be best investigated by means of reddening curves where only a single interstellar cloud lies between the observer and the background source. Published reddening curves often suffer from various systematic uncertainties. We merged a sample of 820 reddening curves of stars for which both FOR…
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…