Search Publications
Wide-area photometric and astrometric (Gaia DR2) study of the young cluster NGC 6530
Micela, G.; Sciortino, S.; Prisinzano, L. +1 more
Context. NGC 6530 is a young cluster, with a complex morphology and star-formation history. We present a statistical study of its global properties, using a new, large list of candidate members down to masses of 0.2-0.4 M⊙ and Gaia DR2 astrometry.
Aims: We consider a larger sky region compared to previous studies, to investigate th…
Observing the gas component of circumplanetary disks around wide-orbit planet-mass companions in the (sub)mm regime
Waters, L. B. F. M.; Woitke, P.; Kamp, I. +6 more
Context. Several detections of wide-orbit planet-mass/substellar companions around young solar-like stars were reported in the last decade. The origin of those possible planets is still unclear, but accretion tracers and VLT/SPHERE observations indicate that they are surrounded by circumplanetary material or even a circumplanetary disk (CPD).
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Dust production in the debris disk around HR 4796 A
Ménard, F.; Augereau, J. -C.; Bayo, A. +21 more
Context. Debris disks are the natural by-products of the planet formation process. Scattered or polarized light observations are mostly sensitive to small dust grains that are released from the grinding down of bigger planetesimals.
Aims: High angular resolution observations at optical wavelengths can provide key constraints on the radial and…
Investigating dynamical properties of evolved Galactic open clusters
Corradi, W. J. B.; Santos, J. F. C.; Maia, F. F. S. +1 more
Context. The stellar content of Galactic open clusters is gradually depleted during their evolution as a result of internal relaxation and external interactions. The final residues of the long-term evolution of open clusters are called open cluster remnants. These are sparsely populated structures that can barely be distinguished from the field. <…
Constraining models of activity on comet 67P/Churyumov-Gerasimenko with Rosetta trajectory, rotation, and water production measurements
Jorda, L.; Kührt, E.; Mottola, S. +11 more
Aims: We use four observational data sets, mainly from the Rosetta mission, to constrain the activity pattern of the nucleus of comet 67P/Churyumov-Gerasimenko (67P).
Methods: We developed a numerical model that computes the production rate and non-gravitational acceleration of the nucleus of comet 67P as a function of time, taking into …
Plasma properties of suprathermal electrons near comet 67P/Churyumov-Gerasimenko with Rosetta
Henri, P.; Goldstein, R.; Galand, M. +6 more
Context. The Rosetta spacecraft escorted comet 67P/Churyumov-Gerasimenko from 2014 to September 2016. The mission provided in situ observations of the cometary plasma during different phases of the cometary activity, which enabled us to better understand its evolution as a function of heliocentric distance.
Aims: In this study, different elec…
Nitrogen abundance in the X-ray halos of clusters and groups of galaxies
Gu, Liyi; Mao, Junjie; Kaastra, Jelle S. +6 more
Context. Chemical abundances in the X-ray halos (also known as the intracluster medium, ICM) of clusters and groups of galaxies can be measured via prominent emission line features in their X-ray spectra. Elemental abundances are footprints of time-integrated yields of various stellar populations that have left their specific abundance patterns pr…
Interstellar dust in the solar system: model versus in situ spacecraft data
Altobelli, Nicolas; Krüger, Harald; Grün, Eberhard +3 more
Context. In the early 1990s, contemporary interstellar dust penetrating deep into the heliosphere was identified with the in situ dust detector on board the Ulysses spacecraft. Later on, interstellar dust was also identified in the data sets measured with dust instruments on board Galileo, Cassini, and Helios. Ulysses monitored the interstellar du…
Period-luminosity diagram of long period variables in the Magellanic Clouds. New aspects revealed from Gaia Data Release 2
Mowlavi, N.; Lecoeur-Taïbi, I.; Lebzelter, T. +4 more
Context. The period-luminosity diagram (PLD) has proven to be a powerful tool for studying populations of pulsating red giants. Gaia Data Release 2 (DR2) provides a large data set including many long-period variables (LPVs) on which this tool can be applied.
Aims: We investigate the location of LPVs from the Large and Small Magellanic Clouds …
HD 101584: circumstellar characteristics and evolutionary status
Lindqvist, M.; Olofsson, H.; Bergman, P. +8 more
Context. There is growing evidence that red giant evolution is often affected by an interplay with a nearby companion, in some cases taking the form of a common-envelope evolution.
Aims: We have performed a study of the characteristics of the circumstellar environment of the binary object HD 101584, that provides information on a likely evolu…