Search Publications
DEATHSTAR: Nearby AGB stars with the Atacama Compact Array. I. CO envelope sizes and asymmetries: A new hope for accurate mass-loss-rate estimates
Lindqvist, M.; Olofsson, H.; Sahai, R. +16 more
Context. This is the first publication from the DEATHSTAR project. The overall goal of the project is to reduce the uncertainties of the observational estimates of mass-loss rates from evolved stars on the Asymptotic Giant Branch (AGB). Aim. The aim in this first publication is to constrain the sizes of the 12CO emitting region from the…
Ongoing flyby in the young multiple system UX Tauri
Pinte, C.; Ménard, F.; van der Plas, G. +28 more
We present observations of the young multiple system UX Tauri to look for circumstellar disks and for signs of dynamical interactions. We obtained SPHERE/IRDIS deep differential polarization images in the J and H bands. We also used ALMA archival CO data. Large extended spirals are well detected in scattered light coming out of the disk of UX Tau …
Modeling protoplanetary disk SEDs with artificial neural networks. Revisiting the viscous disk model and updated disk masses
Sarro, L. M.; Ribas, Á.; Macías, E. +1 more
We model the spectral energy distributions (SEDs) of 23 protoplanetary disks in the Taurus-Auriga star-forming region using detailed disk models and a Bayesian approach. This is made possible by combining these models with artificial neural networks to drastically speed up their performance. Such a setup allows us to confront α-disk models with ob…
Demographics of disks around young very low-mass stars and brown dwarfs in Lupus
de Gregorio-Monsalvo, I.; Henning, T.; Pascucci, I. +15 more
We present new 890 µm continuum ALMA observations of five brown dwarfs (BDs) with infrared excess in Lupus I and III, which in combination with four previously observed BDs allowed us to study the millimeter properties of the full known BD disk population of one star-forming region. Emission is detected in five out of the nine BD disks. Dust…
Precise mass and radius of a transiting super-Earth planet orbiting the M dwarf TOI-1235: a planet in the radius gap?
Fridlund, M.; Rauer, H.; Amado, P. J. +81 more
We report the confirmation of a transiting planet around the bright weakly active M0.5 V star TOI-1235 (TYC 4384-1735-1, V ≈ 11.5 mag), whose transit signal was detected in the photometric time series of sectors 14, 20, and 21 of the TESS space mission. We confirm the planetary nature of the transit signal, which has a period of 3.44 d, by using p…
ISPY-NACO Imaging Survey for Planets around Young stars. Survey description and results from the first 2.5 years of observations
Queloz, D.; Quanz, S. P.; Avenhaus, H. +21 more
Context. The occurrence rate of long-period (a ≳ 50 au) giant planets around young stars is highly uncertain since it is not only governed by the protoplanetary disc structure and planet formation process, but also reflects both dynamical re-structuring processes after planet formation as well as possible capture of planets not formed in situ. Dir…
Rapid late-time X-ray brightening of the tidal disruption event OGLE16aaa
Kajava, Jari J. E.; Miniutti, Giovanni; Giustini, Margherita +1 more
Stars that pass too close to a super-massive black hole may be disrupted by strong tidal forces. OGLE16aaa is one such tidal disruption event (TDE) which rapidly brightened and peaked in the optical/UV bands in early 2016 and subsequently decayed over the rest of the year. OGLE16aaa was detected in an XMM-Newton X-ray observation on June 9, 2016 w…
Differential abundances of open clusters and their tidal tails: Chemical tagging and chemical homogeneity
Casamiquela, L.; Soubiran, C.; Heiter, U. +4 more
Context. Well studied open clusters (OCs) of the solar neighborhood are frequently used as reference objects to test galactic and stellar theories. For that purpose, their chemical composition needs to be known with a high level of confidence. It is also important to clarify if each OC is chemically homogeneous and if it has a unique chemical sign…
Understanding the origins of the heliosphere: integrating observations and measurements from Parker Solar Probe, Solar Orbiter, and other space- and ground-based observatories
Williams, D.; Solanki, S. K.; Müller, D. +28 more
Context. The launch of Parker Solar Probe (PSP) in 2018, followed by Solar Orbiter (SO) in February 2020, has opened a new window in the exploration of solar magnetic activity and the origin of the heliosphere. These missions, together with other space observatories dedicated to solar observations, such as the Solar Dynamics Observatory, Hinode, I…
Dust and gas content of high-redshift galaxies hosting obscured AGN in the Chandra Deep Field-South
Pozzi, F.; Feltre, A.; Fritz, J. +14 more
Context. Obscured active galactic nuclei (AGN) represent a significant fraction of the entire AGN population, especially at high redshift (∼70% at z = 3 - 5). They are often characterized by the presence of large gas and dust reservoirs that are thought to sustain and possibly obscure vigorous star formation processes that make these objects shine…