Search Publications
Distant activity of 67P/Churyumov-Gerasimenko in 2014: Ground-based results during the Rosetta pre-landing phase
Faggi, Sara; Tubiana, Cecilia; Guilbert-Lepoutre, Aurélie +14 more
Context. As the ESA Rosetta mission approached, orbited, and sent a lander to comet 67P/Churyumov-Gerasimenko in 2014, a large campaign of ground-based observations also followed the comet.
Aims: We constrain the total activity level of the comet by photometry and spectroscopy to place Rosetta results in context and to understand the large-sc…
The spectroscopic imprint of the pre-eruptive configuration resulting into two major coronal mass ejections
Gontikakis, C.; Patsourakos, S.; Tsinganos, K. +1 more
Aims: We present a spectroscopic analysis of the pre-eruptive configuration of active region NOAA 11429, prior to two very fast coronal mass ejections (CMEs) on March 7, 2012 that are associated with this active region. We study the thermal components and the dynamics associated with the ejected flux ropes.
Methods: Using differential em…
The panchromatic spectroscopic evolution of the classical CO nova V339 Delphini (Nova Del 2013) until X-ray turnoff
Buil, C.; Scaringi, S.; Shore, S. N. +10 more
Context. Classical novae are the product of thermonuclear runaway-initiated explosions occurring on accreting white dwarfs.
Aims: V339 Del (Nova Delphinus 2013) was one of the brightest classical novae of the last hundred years. Spectroscopy and photometry are available from γ-rays through infrared at stages that have frequently not been obse…
The impact of the SZ effect on cm-wavelength (1-30 GHz) observations of galaxy cluster radio relics
Vazza, Franco; Basu, Kaustuv; Erler, Jens +1 more
Radio relics in galaxy clusters are believed to be associated with powerful shock fronts that originate during cluster mergers, and are a testbed for the acceleration of relativistic particles in the intracluster medium. Recently, radio relic observations have pushed into the cm-wavelength domain (1-30 GHz) where a break from the standard synchrot…
Gliese 710 will pass the Sun even closer. Close approach parameters recalculated based on the first Gaia data release
Dybczyński, Piotr A.; Berski, Filip
Context. First results based on Gaia data show that the well-known star Gliese 710 will be the closest flyby star in the next several Myrs and its minimum distance from the Sun will be almost five times smaller than that suggested by pre-Gaia solution.
Aims: The aim of this work is to investigate the proximity parameters and the influence of …
Do siblings always form and evolve simultaneously? Testing the coevality of multiple protostellar systems through SEDs
Fedele, D.; van Dishoeck, E. F.; Murillo, N. M. +1 more
Context. Multiplicity is common in field stars and among protostellar systems. Models suggest two paths of formation: turbulent fragmentation and protostellar disk fragmentation.
Aims: We attempt to find whether or not the coevality frequency of multiple protostellar systems can help to better understand their formation mechanism. The coevali…
HDO and SO2 thermal mapping on Venus. III. Short-term and long-term variations between 2012 and 2016
Encrenaz, T.; Atreya, S. K.; Bézard, B. +6 more
We present the analysis of a four-year observational campaign using the TEXES high-resolution imaging spectrometer at the NASA Infrared Telescope Facility to map sulfur dioxide and deuterated water over the disk of Venus. Data have been recorded in two spectral ranges around 1345 cm-1 (7.4 µm) and 530 cm-1 (19 µm)…
Radial velocities of K-M dwarfs and local stellar kinematics
Sperauskas, J.; Bartašiūtė, S.; Deveikis, V. +3 more
Aims: The goal of this paper is to present complete radial-velocity data for the spectroscopically selected McCormick sample of nearby K-M dwarfs and, based on these and supplementary data, to determine the space-velocity distributions of late-type stars in the solar neighborhood.
Methods: We analyzed nearly 3300 measurements of radial v…
Relation between trees of fragmenting granules and supergranulation evolution
Roudier, Th.; Malherbe, J. M.; Rieutord, M. +1 more
Context. The determination of the underlying mechanisms of the magnetic elements diffusion over the solar surface is still a challenge. Understanding the formation and evolution of the solar network (NE) is a challenge, because it provides a magnetic flux over the solar surface comparable to the flux of active regions at solar maximum.
Aims: …
Herschel-PACS observations of far-IR lines in young stellar objects. I. [OI] and H2O at 63 µm
Kamp, I.; Eiroa, C.; Montesinos, B. +2 more
Context. Gas plays a major role in the dynamical evolution of young stellar objects (YSOs). Its interaction with the dust is the key to our understanding planet formation later on in the protoplanetary disc stage. Studying the gas content is therefore a crucial step towards understanding YSO and planet formation. Such a study can be made through s…