Search Publications
Damping of slow magnetoacoustic oscillations by the misbalance between heating and cooling processes in the solar corona
Nakariakov, V. M.; Kolotkov, D. Y.; Zavershinskii, D. I.
Context. Rapidly decaying slow magnetoacoustic waves are regularly observed in the solar coronal structures, offering a promising tool for a seismological diagnostics of the coronal plasma, including its thermodynamical properties.
Aims: The effect of damping of standing slow magnetoacoustic oscillations in the solar coronal loops is investig…
Multiplicity of Galactic Cepheids and RR Lyrae stars from Gaia DR2. I. Binarity from proper motion anomaly
Mérand, Antoine; Gieren, Wolfgang; Gallenne, Alexandre +8 more
Context. Classical Cepheids (CCs) and RR Lyrae stars (RRLs) are important classes of variable stars used as standard candles to estimate galactic and extragalactic distances. Their multiplicity is imperfectly known, particularly for RRLs. Astoundingly, to date only one RRL has convincingly been demonstrated to be a binary, TU UMa, out of tens of t…
High gas-to-dust size ratio indicating efficient radial drift in the mm-faint CX Tauri disk
Tazzari, M.; Facchini, S.; Manara, C. F. +7 more
The large majority of protoplanetary disks have very compact continuum emission (≲15 AU) at millimeter wavelengths. However, high angular resolution observations that resolve these small disks are still lacking, due to their intrinsically fainter emission compared with large bright disks. In this Letter we present 1.3 mm ALMA data of the faint dis…
The Close AGN Reference Survey (CARS). A massive multi-phase outflow impacting the edge-on galaxy HE 1353-1917
Gaspari, M.; Combes, F.; Scharwächter, J. +15 more
Context. Galaxy-wide outflows driven by star formation and/or an active galactic nucleus (AGN) are thought to play a crucial rule in the evolution of galaxies and the metal enrichment of the inter-galactic medium. Direct measurements of these processes are still scarce and new observations are needed to reveal the nature of outflows in the majorit…
The mean Hα EW and Lyman-continuum photon production efficiency for faint z ≈ 4-5 galaxies
Bacon, Roland; Boogaard, Leindert A.; Mahler, Guillaume +9 more
We present the first measurements of the Lyman-continuum photon production efficiency ξion, 0 at z ∼ 4-5 for galaxies fainter than 0.2 L* (-19 mag). ξion, 0 quantifies the production rate of ionizing photons with respect to the UV luminosity density assuming a fiducial escape fraction of zero. Extending previous me…
Cloudlet capture by transitional disk and FU Orionis stars
Kramer, M.; Fukagawa, M.; Dullemond, C. P. +3 more
After its formation, a young star spends some time traversing the molecular cloud complex in which it was born. It is therefore not unlikely that, well after the initial cloud collapse event which produced the star, it will encounter one or more low mass cloud fragments, which we call "cloudlets" to distinguish them from full-fledged molecular clo…
A search for accreting young companions embedded in circumstellar disks. High-contrast Hα imaging with VLT/SPHERE
Pinte, C.; van der Plas, G.; Quanz, S. P. +37 more
Context. In recent years, our understanding of giant planet formation progressed substantially. There have even been detections of a few young protoplanet candidates still embedded in the circumstellar disks of their host stars. The exact physics that describes the accretion of material from the circumstellar disk onto the suspected circumplanetar…
Binarity among CEMP-no stars: an indication of multiple formation pathways?
Arentsen, A.; Starkenburg, E.; Venn, K. A. +3 more
Carbon-enhanced metal-poor (CEMP) stars comprise a high percentage of stars at the lowest metallicities. The stars in the CEMP-no subcategory do not show any s-process enhancement and therefore cannot easily be explained by transfer of carbon and s-process elements from a binary AGB companion. We have performed radial velocity monitoring of a samp…
Characterization of the L 98-59 multi-planetary system with HARPS. Mass characterization of a hot super-Earth, a sub-Neptune, and a mass upper limit on the third planet
Bouchy, F.; Doyon, R.; Ségransan, D. +33 more
Aims: L 98-59 (TIC 307210830, TOI-175) is a nearby M3 dwarf around which TESS revealed three small transiting planets (0.80, 1.35, 1.57 Earth radii) in a compact configuration with orbital periods shorter than 7.5 days. Here we aim to measure the masses of the known transiting planets in this system using precise radial velocity (RV) measurem…
GALACTICNUCLEUS: A high-angular-resolution JHKs imaging survey of the Galactic centre. II. First data release of the catalogue and the most detailed CMDs of the GC
Nishiyama, S.; Najarro, F.; Nogueras-Lara, F. +7 more
Context. The high extinction and extreme source crowding of the central regions of the Milky Way are serious obstacles to the study of the structure and stellar population of the Galactic centre (GC). Existing surveys that cover the GC region (2MASS, UKIDSS, VVV, SIRIUS) do not have the necessary high angular resolution. Therefore, a high-angular-…