Search Publications
Mapping the solar wind HI outflow velocity in the inner heliosphere by coronagraphic ultraviolet and visible-light observations
Sasso, C.; Romoli, M.; Andretta, V. +18 more
We investigated the capability of mapping the solar wind outflow velocity of neutral hydrogen atoms by using synergistic visible-light and ultraviolet observations. We used polarised brightness images acquired by the LASCO/SOHO and Mk3/MLSO coronagraphs, and synoptic Lyα line observations of the UVCS/SOHO spectrometer to obtain daily maps of solar…
The perturbed sublimation rim of the dust disk around the post-AGB binary IRAS08544-4431
Regibo, S.; Min, M.; Van Winckel, H. +4 more
Context. Post-asymptotic giant branch (post-AGB) binaries are surrounded by stable dusty and gaseous disks similar to the ones around young stellar objects. Whereas, significant effort has been spent on modeling observations of disks around young stellar objects, the disks around post-AGB binaries have received significantly less attention, even t…
First scattered light detection of a nearly edge-on transition disk around the T Tauri star RY Lupi
Pinte, C.; Avenhaus, H.; Henning, T. +41 more
Context. Transition disks are considered sites of ongoing planet formation, and their dust and gas distributions could be signposts of embedded planets. The transition disk around the T Tauri star RY Lup has an inner dust cavity and displays a strong silicate emission feature.
Aims: Using high-resolution imaging we study the disk geometry, in…
Structure and kinematics of Type II Cepheids in the Galactic bulge based on near-infrared VVV data
Minniti, D.; Rejkuba, M.; Contreras Ramos, R. +5 more
Context. Type II Cepheids (T2Cs) are radially pulsating variables that trace old stellar populations and provide distance estimates through their period-luminosity (PL) relation.
Aims: We trace the structure of old stellar population in the Galactic bulge using new distance estimates and kinematic properties of T2Cs.
Methods: We present …
The AKARI 2.5-5 micron spectra of luminous infrared galaxies in the local Universe
Inami, H.; Armus, L.; Surace, J. +10 more
We present AKARI 2.5-5 µm spectra of 145 local luminous infrared galaxies (LIRG; LIR ≥ 1011 L⊙) in the Great Observatories All-sky LIRG Survey (GOALS). In all of the spectra, we measure the line fluxes and equivalent widths (EQWs) of the polycyclic aromatic hydrocarbon (PAH) at 3.3 µm and the hydrogen r…
NuSTAR and NICER reveal IGR J17591-2342 as a new accreting millisecond X-ray pulsar
Altamirano, D.; Sanna, A.; Ray, P. S. +21 more
We report the discovery by the Nuclear Spectroscopic Telescope Array (NuSTAR) and the Neutron Star Interior Composition Explorer (NICER) of the accreting millisecond X-ray pulsar IGR J17591-2342. Coherent X-ray pulsations around 527.4 Hz (1.9 ms) with a clear Doppler modulation were detected. This implies an orbital period of ∼8.8 h and a projecte…
Spatially resolving the dust properties and submillimetre excess in M 33
Boquien, M.; De Looze, I.; Braine, J. +9 more
Context. The relative abundance of the dust grain types in the interstellar medium is directly linked to physical quantities that trace the evolution of galaxies. Because of the poor spatial resolution of the infrared and submillimetre data, we are able to study the dependence of the resolved infrared spectral energy distribution (SED) across regi…
Investigating the dynamical history of the interstellar object 'Oumuamua
Dybczyński, Piotr A.; Królikowska, Małgorzata
Here we try to find the origin of 1I/2017 U1 'Oumuamua, the first interstellar object recorded inside the solar system. To this aim, we searched for close encounters between 'Oumuamua and all nearby stars with known kinematic data during their past motion. We had checked over 200 thousand stars and found just a handful of candidates. If we limit o…
Linking interstellar and cometary O2: a deep search for 16O18O in the solar-type protostar IRAS 16293-2422
Altwegg, K.; Codella, C.; Bieler, A. +15 more
Recent measurements carried out at comet 67P/Churyumov-Gerasimenko (67P) with the Rosetta probe revealed that molecular oxygen, O2, is the fourth most abundant molecule in comets. Models show that O2 is likely of primordial nature, coming from the interstellar cloud from which our solar system was formed. However, gaseous O
Towards a census of high-redshift dusty galaxies with Herschel. A selection of "500 µm-risers"
Buat, V.; Pappalardo, C.; Alvarez-Marquez, J. +6 more
Context. Over the last decade a large number of dusty star-forming galaxies has been discovered up to redshift z = 2 - 3 and recent studies have attempted to push the highly confused Herschel SPIRE surveys beyond that distance. To search for z ≥ 4 galaxies they often consider the sources with fluxes rising from 250 µm to 500 µm (so-cal…