Search Publications
Investigating the Rosetta/RTOF observations of comet 67P/Churyumov-Gerasimenko using a comet nucleus model: influence of dust mantle and trapped CO
Lasue, J.; Altwegg, K.; Garnier, P. +6 more
Context. Cometary outgassing is induced by the sublimation of ices and the ejection of dust originating from the nucleus. Therefore measuring the composition and dynamics of the cometary gas provides information concerning the interior composition of the body. Nevertheless, the bulk composition differs from the coma composition, and numerical mode…
Gas and dust cooling along the major axis of M 33 (HerM33es). Herschel/PACS [C II] and [O I] observations
Boquien, Médéric; van der Werf, Paul; Combes, Françoise +17 more
Context. M 33 is a gas rich spiral galaxy of the Local Group. Its vicinity allows us to study its interstellar medium (ISM) on linear scales corresponding to the sizes of individual giant molecular clouds.
Aims: We investigate the relationship between the two major gas cooling lines and the total infrared (TIR) dust continuum.
Methods: W…
Disc light variability in the FUor star V646 Puppis as observed by TESS and from the ground
Ogłoza, Waldemar; Siwak, Michał; Krzesiński, Jerzy
Context. We investigate small-scale light variations in V646 Pup occurring on timescales of days, weeks, and years.
Aims: We aim to investigate whether this variability is similar to that observed in FU Ori.
Methods: We observed V646 Pup on six occasions at the SAAO and CTIO between 2013 and 2018 with Johnson and Sloan filters, typically…
"TNOs are Cool": A survey of the trans-Neptunian region. XV. Physical characteristics of 23 resonant trans-Neptunian and scattered disk objects
Pál, A.; Lellouch, E.; Marton, G. +7 more
The goal of this work is to determine the physical characteristics of resonant, detached and scattered disk objects in the trans-Neptunian region, observed mainly in the framework of the "TNOs are Cool" Herschel open time key programme. Based on thermal emission measurements with the Herschel/PACS and Spitzer/MIPS instruments, we determine size, a…
Massive molecular gas reservoir around the central AGN in the CARLA J1103 + 3449 cluster at z = 1.44
Markov, Vladan; Noirot, Gaël; Gonzalez, Anthony H. +14 more
Passive early-type galaxies dominate cluster cores at z ≲ 1.5. At higher redshift, cluster core galaxies are observed to have on-going star-formation, which is fueled by cold molecular gas. We measured the molecular gas reservoir of the central region around the radio-loud active galactic nucleus (AGN) in the cluster CARLA J1103 + 3449 at z = 1.44…
Solar east-west flow correlations that persist for months at low latitudes are dominated by active region inflows
Gizon, Laurent; Birch, Aaron C.; Duvall, Thomas L. +2 more
Context. Giant-cell convection is believed to be an important component of solar dynamics. For example, it is expected to play a crucial role in maintaining the Sun's differential rotation.
Aims: We reexamine early reports of giant convective cells detected using a correlation analysis of Dopplergrams. We extend this analysis using 19 years o…
The historical record of massive star formation in Cygnus
Comerón, F.; Schneider, N.; Pasquali, A. +1 more
Context. The Cygnus region, which dominates the local spiral arm of the Galaxy, is one of the nearest complexes of massive star formation, extending over several hundred parsecs. Its massive stellar content, regions of ongoing star formation, and molecular gas have been studied in detail at virtually all wavelengths. However, little is known of th…
Sporadic and intense accretion in a 1 Myr-old brown dwarf candidate
Bessell, M. S.; Murphy, S. J.; Nguyen-Thanh, D. +1 more
Context. Studying the accretion process in very low-mass objects has important implications for understanding their formation mechanism. Many nearby late-M dwarfs that have previously been identified in the field are in fact young brown dwarf members of nearby young associations. Some of them are still accreting. They are therefore excellent targe…
Evolution of exploding granules from coordinated observations by THEMIS, IRIS, SDO/HMI, and HINODE, and a simulation
Malherbe, J. M.; Dalmasse, K.; Roudier, T. +3 more
Exploding granules constitute the strongest horizontal flows on the quiet Sun and contribute to the structure of the surface horizontal velocity fields which build the large-scale organization of the discrete magnetic field. In this work we explore exploding granule expansion through the observations of the ground-based THEMIS telescope, IRIS, SDO…
How to disentangle geometry and mass-loss rate from AGB-star spectral energy distributions. The case of EP Aquarii
Jorissen, A.; Decin, L.; Groenewegen, M. A. T. +2 more
Context. High-angular-resolution observations of asymptotic giant branch (AGB) stars often reveal non-spherical morphologies for the gas and dust envelopes.
Aims: We aim to make a pilot study to quantify the impact of different geometries (spherically symmetric, spiral-shaped, and disc-shaped) of the dust component of AGB envelopes on spectra…