Search Publications
Scaling slowly rotating asteroids with stellar occultations
Geier, S.; Urbanik, M.; Pál, A. +176 more
Context. As evidenced by recent survey results, the majority of asteroids are slow rotators (spin periods longer than 12 h), but lack spin and shape models because of selection bias. This bias is skewing our overall understanding of the spins, shapes, and sizes of asteroids, as well as of their other properties. Also, diameter determinations for l…
PENELLOPE. V. The magnetospheric structure and the accretion variability of the classical T Tauri star HM Lup
Kóspál, Á.; Alcalá, J. M.; Manara, C. F. +9 more
HM Lup is a young M-type star that accretes material from a circumstellar disk through a magnetosphere. Our aim is to study the inner disk structure of HM Lup and to characterize its variability. We used spectroscopic data from HST/STIS, X-shooter, and ESPRESSO taken in the framework of the ULLYSES and PENELLOPE programs, together with photometric…
Supersoft luminous X-ray sources in galactic nuclei
Miniutti, G.; Risaliti, G.; Sacchi, A.
Context. Tidal disruption events (TDEs) are usually discovered at X-ray or optical wavelengths through their transient nature. A characteristic spectral feature of X-ray detected TDEs is a `supersoft' X-ray emission, not observed in any other extragalactic source, with the exception of a few rapidly variable hyperluminous X-ray sources (HLXs) or s…
Testing protoplanetary disc evolution with CO fluxes. A proof of concept in Lupus and Upper Sco
Facchini, Stefano; Manara, Carlo F.; Zagaria, Francesco +3 more
The Atacama Large Millimeter/submillimeter Array (ALMA) revolutionised our understanding of protoplanetary discs. However, the available data have not given conclusive answers yet on the underlying disc evolution mechanisms: viscosity or magnetohydrodynamic (MHD) winds. Improving upon the current results, mostly based on the analysis of disc sizes…
The Hubble PanCET program: The near-ultraviolet transmission spectrum of WASP-79b
Lecavelier des Etangs, A.; Bourrier, V.; Sing, D. K. +11 more
We present Hubble Space Telescope (HST) transit observations of the Hot-Jupiter WASP-79 b acquired with the Space Telescope Imaging Spectrograph (STIS) in the near ultraviolet (NUV). Two transit observations, part of the PanCET program, are used to obtain the transmission spectra of the planet between 2280 and 3070 Å. We correct for systematic eff…
High-energy particle enhancements in the solar wind upstream Mercury during the first BepiColombo flyby: SERENA/PICAM and MPO-MAG observations
Kallio, E.; Barabash, S.; Livi, S. +27 more
Context. The first BepiColombo Mercury flyby offered the unique opportunity to simultaneously characterize the plasma and the magnetic field properties of the solar wind in the vicinity of the innermost planet of the Solar System (0.4 AU).
Aims: In this study, we use plasma observations by SERENA/PICAM and magnetic field measurements by MPO-M…
Discovery of periodicities in two highly variable intermediate polars towards the Galactic centre
Mori, Kaya; Morris, Mark R.; Rea, Nanda +5 more
Aims: We performed a systematic analysis of X-ray point sources within 1.°5 of the Galactic centre using archival XMM-Newton data. While doing so, we discovered Fe Kα complex emission and pulsation in two highly variable sources, 4XMM J174917.7-283329 and 4XMM J174954.6-294336. In this work we report the findings of the …
Coordinated X-ray and UV absorption within the accretion disk wind of the active galactic nucleus PG 1126-041
Cappi, M.; Ponti, G.; Vignali, C. +14 more
Context. Accretion disk winds launched close to supermassive black holes (SMBHs) are a viable mechanism providing feedback between the SMBH and the host galaxy.
Aims: We aim to characterize the X-ray properties of the inner accretion disk wind of the nearby active galactic nucleus PG 1126-041 and to study its connection with the UV-absorbing …
A possible dwarf galaxy satellite-of-satellite problem in ΛCDM
Müller, Oliver; Heesters, Nick; Jerjen, Helmut +2 more
Dark matter clusters on all scales, and it is therefore expected that even substructure should host its own substructure. Using the Extragalactic Distance Database, we searched for dwarf-galaxy satellites of dwarf galaxies, that is, satellite-of-satellite galaxies, corresponding to these substructures of substructure. From investigation of Hubble …
PM 1-322: New variable planetary nebula
Paunzen, E.; Bernhard, K.; Hümmerich, S. +4 more
Context. Spectra of planetary nebulae (PNe) are characterised by strong forbidden emission lines and often also by an infrared (IR) excess. A few PNe show dust obscuration events and/or harbour long-period binaries. Some post-asymptotic giant branch stars, symbiotic stars, or B[e] stars may feature similar characteristics. Recently, dust clouds ec…