Search Publications
Galactic and stellar perturbations of long-period comet motion. Practical considerations
Dybczyński, Piotr A.; Breiter, Sławomir
Context. Thanks to our expanding knowledge of the Galactic and stellar neighborhood of the Solar System, modern long-period comet motion studies must take into account both stellar perturbations and the overall Galactic potential.
Aims: Our aim is to propose algorithms and methods that aid in performing numerical integrations of equations of …
The detection of magnetic chemically peculiar stars using Gaia BP/RP spectra
Paunzen, E.; Prišegen, M.
Context. The magnetic chemically peculiar (mCP) stars of the upper main sequence are perfectly suited to studying the effects of rotation, diffusion, mass-loss, accretion, and pulsation in the presence of an organized stellar magnetic field. Therefore, many important models can only be tested with this star group.
Aims: In this case study we …
The Gaia-ESO survey: A spectroscopic study of the young open cluster NGC 3293
Gilmore, G.; Gosset, E.; Herrero, A. +24 more
We present a spectroscopic analysis of the GIRAFFE and UVES data collected by the Gaia-ESO survey for the young open cluster NGC 3293. Archive spectra from the same instruments obtained in the framework of the `VLT-FLAMES survey of massive stars' are also analysed. Atmospheric parameters, non-local thermodynamic equilibrium (LTE) chemical abundanc…
An X-ray fading, UV brightening QSO at z ≈ 6
Bauer, F. E.; Brandt, W. N.; Vignali, C. +13 more
Explaining the existence of super massive black holes (SMBHs) with MBH ≳ 108 M⊙ at z ≳ 6 is a persistent challenge to modern astrophysics. Multiwavelength observations of z ≳ 6 quasi-stellar objects (QSOs) reveal that, on average, their accretion physics is similar to that of their counterparts at lower redshift. H…
An old warm Jupiter orbiting the metal-poor G-dwarf TOI-5542
Jordán, Andrés; Stassun, Keivan G.; Worters, Hannah L. +30 more
We report the discovery of a 1.32−0.10+0.10 MJup planet orbiting on a 75.12 day period around the G3V 10.8−3.6+2.1 Gyr old star TOI-5542 (TIC 466206508; TYC 9086-1210-1). The planet was first detected by the Transiting Exoplanet Survey Satellite (TESS) as a single transit event in TESS Sector …
No swan song for Sun-as-a-star helioseismology: Performances of the Solar-SONG prototype for individual mode characterisation
Christensen-Dalsgaard, J.; García, R. A.; Grundahl, F. +5 more
The GOLF instrument on board SoHO has been in operation for almost 25 years, but the ageing of the instrument has now strongly affected its performance, especially in the low-frequency pressure-mode (p-mode) region. At the end of the SoHO mission, the ground-based network BiSON will remain the only facility able to perform Sun-integrated helioseis…
Power distribution of oscillations in the atmosphere of a plage region. Joint observations with ALMA, IRIS, and SDO
Wedemeyer, Sven; Fleck, Bernhard; Jafarzadeh, Shahin +3 more
Context. Joint observations of the Atacama Large Millimeter/Submillimeter Array (ALMA) with other solar observatories can provide a wealth of opportunities for understanding the coupling between different layers of the solar atmosphere.
Aims: We present a statistical analysis of the power distribution of oscillations in a plage region in acti…
ESASky SSOSS: Solar System Object Search Service and the case of Psyche
Valtchanov, I.; López-Caniego, M.; Küppers, M. +18 more
Context. The store of data collected in public astronomical archives across the world is continuously expanding and, thus, providing a convenient interface for accessing this information is a major concern for ensuring a second life for the data. In this context, Solar System objects (SSOs) are often difficult or even impossible to query, owing to…
Dents in the Veil: protostellar feedback in Orion
Bally, J.; Goicoechea, J. R.; van der Tak, F. F. S. +3 more
Context. Interest in stellar feedback has recently increased because new studies suggest that radiative and mechanical feedback from young massive stars significantly regulates the physical and chemical composition of the interstellar medium. Recent SOFIA [C II] 158 µm observations of the Orion Veil have revealed that the expanding bubble is…
Common patterns in pulse profiles of high-mass X-ray binaries
Kretschmar, P.; Caballero, I.; Fürst, F. +2 more
Context. X-ray pulsars are binary systems which consist of a neutron star in orbit with a mass donor (companion). In these systems the neutron accretes matter from the companion star, which creates accretion columns or hot spots on the neutron star surface and gives rise to pulsations in the X-ray light curve. The pulse profiles carry information …