Search Publications
Evidence for feedback and stellar-dynamically regulated bursty star cluster formation: the case of the Orion Nebula Cluster
Kroupa, Pavel; Beccari, Giacomo; Jeřábková, Tereza +2 more
A scenario for the formation of multiple co-eval populations separated in age by about 1 Myr in very young clusters (VYCs, ages less than 10 Myr) and with masses in the range 600-20 000 M⊙ is outlined. It rests upon a converging inflow of molecular gas building up a first population of pre-main sequence stars. The associated just-formed…
Molecular gas content in obscured AGN at z > 1
Daddi, E.; Sargent, M. T.; Vignali, C. +11 more
Aims: The standard active galactic nuclei (AGN)-galaxy co-evolutionary scenario predicts a phase of deeply "buried" supermassive black hole growth coexisting with a starburst (SB) before feedback phenomena deplete the cold molecular gas reservoir of the galaxy and an optically luminous quasar (QSO) is revealed (called the SB-QSO evolutionary …
The chemistry of disks around T Tauri and Herbig Ae/Be stars
Agúndez, Marcelino; Le Petit, Franck; Roueff, Evelyne +1 more
Context. Infrared and (sub-)millimeter observations of disks around T Tauri and Herbig Ae/Be stars point to a chemical differentiation, with a lower detection rate of molecules in disks around hotter stars.
Aims: We aim to investigate the underlying causes of the chemical differentiation indicated by observations and perform a comparative stu…
First detection of H2S in a protoplanetary disk. The dense GG Tauri A ring
Beck, T.; Chapillon, E.; Wakelam, V. +8 more
Context. Studying molecular species in protoplanetary disks is very useful to characterize the properties of these objects, which are the site of planet formation.
Aims: We attempt to constrain the chemistry of S-bearing molecules in the cold parts of circumstellar disk of GG Tau A.
Methods: We searched for H2S, CS, SO, and SO…
Combining low- to high-resolution transit spectroscopy of HD 189733b. Linking the troposphere and the thermosphere of a hot gas giant
Piotto, Giampaolo; Pepe, Francesco; Heng, Kevin +8 more
Space-borne low- to medium-resolution (ℛ 102-103) and ground-based high-resolution spectrographs (ℛ 105) are commonly used to obtain optical and near infrared transmission spectra of exoplanetary atmospheres. In this wavelength range, space-borne observations detect the broadest spectral features (alkali doublets, …
The CARMENES search for exoplanets around M dwarfs. A Neptune-mass planet traversing the habitable zone around HD 180617
Stahl, O.; Amado, P. J.; Bauer, F. F. +37 more
Despite their activity, low-mass stars are of particular importance for the search of exoplanets by the means of Doppler spectroscopy, as planets with lower masses become detectable. We report on the discovery of a planetary companion around HD 180617, a bright (J = 5.58 mag), low-mass (M = 0.45M⊙) star of spectral type M2.5 V. The star…
The Gaia-ESO Survey: properties of newly discovered Li-rich giants
Gilmore, G.; Bayo, A.; Recio-Blanco, A. +41 more
Aims: We report 20 new lithium-rich giants discovered within the Gaia-ESO Survey, including the first Li-rich giant with an evolutionary stage confirmed by CoRoT (Convection, Rotation and planetary Transits) data. We present a detailed overview of the properties of these 20 stars.
Methods: Atmospheric parameters and abundances were deriv…
Possible 1 hour quasi-periodic oscillation in narrow-line Seyfert 1 galaxy MCG-06-30-15
Ho, Luis C.; Gupta, Alok C.; Wiita, Paul J. +3 more
We found a possible 1 h quasi-periodic oscillation (QPO) in a 55 ks X-ray observation of the narrow-line Seyfert 1 galaxy MCG-06-30-15 made with the XMM-Newton EPIC/pn detector in the energy range 0.3-10 keV. We identify a total modulation of 16% in the light curve and find a ≃3670 s quasi-period using Lomb-Scargle periodogram (LSP) and weighted w…
Ubiquitous ram pressure stripping in the Coma cluster of galaxies
Boselli, A.; Gavazzi, G.; Consolandi, G. +2 more
We report the detection of Hα trails behind three new intermediate-mass irregular galaxies in the NW outskirts of the nearby cluster of galaxies Abell 1656 (Coma). Hints that these galaxies possess an extended component were found in earlier, deeper Hα observations carried out with the Subaru telescope. However the lack of a simultaneous r-band ex…
Local growth of dust- and ice-mixed aggregates as cometary building blocks in the solar nebula
Blum, J.; Lacerda, P.; Lorek, S.
Context. Comet formation by gravitational instability requires aggregates that trigger the streaming instability and cluster in pebble-clouds. These aggregates form as mixtures of dust and ice from (sub-)micrometre-sized dust and ice grains via coagulation in the solar nebula. Aim. We investigate the growth of aggregates from (sub-)micrometre-size…