Search Publications
Sixteen overlooked open clusters in the fourth Galactic quadrant. A combined analysis of UBVI photometry and Gaia DR2 with ASteCA
Moitinho, A.; Carraro, G.; Perren, G. I. +3 more
Aims: This paper has two main objectives: (1) To determine the intrinsic properties of 16 faint and mostly unstudied open clusters in the poorly known sector of the Galaxy at 270° -300° to probe the Milky Way structure in future investigations. (2) To address previously reported systematics in Gaia DR2 parallaxes by comparing the cluster dist…
Stellar occultations enable milliarcsecond astrometry for Trans-Neptunian objects and Centaurs
Naletto, G.; Pál, A.; Snodgrass, C. +66 more
Context. Trans-Neptunian objects (TNOs) and Centaurs are remnants of our planetary system formation, and their physical properties have invaluable information for evolutionary theories. Stellar occultation is a ground-based method for studying these distant small bodies and has presented exciting results. These observations can provide precise pro…
A statistical study of plasmoids associated with a post-CME current sheet
Pant, Vaibhav; Banerjee, Dipankar; Patel, Ritesh +1 more
Context. Coronal mass ejections (CMEs) are often observed to be accompanied by flare, current sheets, and plasmoids/plasma blobs. 2D and 3D numerical simulations and observations reported plasmoids moving upward as well as downward along the current sheet.
Aims: We aim to investigate the properties of plasmoids observed in the current sheet f…
Distribution of methanol and cyclopropenylidene around starless cores★
Nagy, Z.; Caselli, P.; Spezzano, S. +3 more
Context. The spatial distribution of molecules around starless cores is a powerful tool for studying the physics and chemistry governing the earliest stages of star formation.
Aims: Our aim is to study the chemical differentiation in starless cores to determine the influence of large-scale effects on the spatial distribution of molecules with…
Superflares on the late-type giant KIC 2852961. Scaling effect behind flaring at different energy levels
Kriskovics, L.; Günther, M. N.; Bhatti, W. +7 more
Context. The most powerful superflares reaching 1039 erg bolometric energy are from giant stars. The mechanism behind flaring is thought to be the magnetic reconnection, which is closely related to magnetic activity (including starspots). However, it is poorly understood how the underlying magnetic dynamo works and how the flare activit…
Coordination of the in situ payload of Solar Orbiter
Lewis, G. R.; Livi, S.; Müller, D. +36 more
Solar Orbiter's in situ coordination working group met frequently during the development of the mission with the goal of ensuring that its in situ payload has the necessary level of coordination to maximise science return. Here we present the results of that work, namely how the design of each of the in situ instruments (EPD, MAG, RPW, SWA) was gu…
Time evolution of dust deposits in the Hapi region of comet 67P/Churyumov-Gerasimenko
Sierks, H.; Fulle, M.; Kührt, E. +25 more
Aims: We provide a measurement of the seasonal evolution of the dust deposit erosion and accretion in the Hapi region of comet 67P/Churyumov-Gerasimenko with a vertical accuracy of 0.2-0.9 m.
Methods: We used OSIRIS Narrow Angle Camera images with a spatial scale of lower than 1.30 m px-1 and developed a tool to monitor the ti…
Exploiting NIKA2/XMM-Newton imaging synergy for intermediate-mass high-z galaxy clusters within the NIKA2 SZ large program. Observations of ACT-CL J0215.4+0030 at z ∼ 0.9
Berta, S.; Aussel, H.; Adam, R. +40 more
High-resolution mapping of the intracluster medium (ICM) up to high redshift and down to low masses is crucial to derive accurate mass estimates of the galaxy cluster and to understand the systematic effects affecting cosmological studies based on galaxy clusters. We present a spatially resolved Sunyaev-Zel'dovich (SZ)/X-ray analysis of ACT-CL J02…
Deep XMM-Newton observations of the northern disc of M31. II. Tracing the hot interstellar medium
Williams, Benjamin F.; Sasaki, Manami; Haberl, Frank +10 more
Aims: We use new deep XMM-Newton observations of the northern disc of M31 to trace the hot interstellar medium (ISM) in unprecedented detail and to characterise the physical properties of the X-ray emitting plasmas.
Methods: We used all XMM-Newton data up to and including our new observations to produce the most detailed image yet of the…
Rotational spectral modulation of cloudless atmospheres for L/T brown dwarfs and extrasolar giant planets
Apai, D.; Tremblin, P.; Bonnefoy, M. +5 more
Aims: The rotational spectral modulation (spectro-photometric variability) of brown dwarfs is usually interpreted as a sign indicating the presence of inhomogeneous cloud covers in the atmosphere. This paper is aimed at exploring the role of temperature fluctuations in these spectral modulations. These fluctuations could naturally arise in a …