Search Publications
Limits on the contribution of early endogenous radiolysis to oxidation in carbonaceous chondrites' parent bodies
Mousis, Olivier; Miller, Kelly E.; Bouquet, Alexis +1 more
Context. Carbonaceous chondrites have undergone alteration in their parent bodies and display oxidized secondary phases, including sulfates in CI and CM chondrites. The cause of the formation of these sulfates is yet to be determined.
Aims: This study investigates the potential of endogenous radiolysis of water (i.e., radiolysis caused by rad…
Tracing the magnetic field morphology of the LDN 1172/1174 cloud complex
Kim, Shinyoung; Sharma, Ekta; Saha, Piyali +3 more
Context. The LDN 1172/1174 cloud complex in the Cepheus Flare region presents a hub-filament structure with the reflection nebula, NGC 7023, illuminated by a Herbig Be star, HD 200775, which consists of the hub with a ~5 pc long narrow filament attached to it. Formation of a sparse cluster of low- and intermediate-mass stars is presently taking pl…
SP_Ace v1.4 and the new GCOG library for deriving stellar parameters and elemental abundances
Vallenari, A.; Lucatello, S.; Boeche, C.
Context. Ongoing and future massive spectroscopic surveys will collect very large numbers (106-107) of stellar spectra that need to be analyzed. Highly automated software is needed to derive stellar parameters and chemical abundances from these spectra.
Aims: We present the new version of SP_Ace (Stellar Parameters And C…
Mapping a duck: geological features and region definitions on comet 67P/Churyumov-Gerasimenko
Küppers, M.; Besse, S.; Grieger, B. +1 more
The data from the Rosetta mission have permitted a reconstruction of the shape of comet 67P/Churyumov-Gerasimenko and an identification of the terrains and features forming the surface. The peculiar shape of the comet has made it challenging to project these geological features onto an unambiguous frame. As a result, the geological maps published …
AGB and RGB stars in the dwarf irregular galaxy Leo A
Stonkutė, Rima; Vansevičius, Vladas; Leščinskaitė, Alina
Context. Leo A is a gas-rich dwarf irregular galaxy of low stellar mass located in the outskirts of the Local Group. It has an extended star formation history with stellar populations spanning a wide age range (∼0.01−10 Gyr). As Leo A is a well-isolated dwarf galaxy, it is a perfect target to study a galactic structure formed entirely by processes…
The relationship between bipolar magnetic regions and their sunspots
Solanki, S. K.; Yeo, K. L.; Krivova, N. A. +1 more
Context. The relationship between bipolar magnetic regions (BMRs) and their sunspots is an important property of the solar magnetic field, but it is not well constrained. One consequence is that it is a challenge for surface flux transport models (SFTMs) based on sunspot observations to determine the details of BMR emergence, which they require as…
A survey of IRAS young stellar object candidates. Searching for large-scale Herbig-Haro objects
Estalella, Robert; Riera, Angels; López, Rosario +1 more
Context. Jets and outflows are associated with young stellar objects across the stellar mass spectrum, from brown dwarf protostars to massive Ae/Be stars. Frequently the jet morphology is spatially discontinuous because of the temporal variability of the ejection from the driving source. Images covering a wide field of view around the jet-driving …
Spatial distribution of the aromatic and aliphatic carbonaceous nanograin features in the protoplanetary disk around HD 100546
Pantin, E.; Ysard, N.; Habart, E. +4 more
Context. Carbonaceous nanograins are present at the surface of protoplanetary disks around Herbig Ae/Be stars, where most of the ultraviolet energy from the central star is dissipated. Efficiently coupled to the gas, they are unavoidable to understand the physics and chemistry of these disks. Furthermore, nanograins are able to trace the outer fla…
Phase-resolved hard X-ray emission of the high-mass binary LS 5039: a spectral hardening above 50 keV detected with INTEGRAL
Bozzo, E.; Bykov, A. M.; Krassilchtchikov, A. M. +3 more
Aims: LS 5039 is an enigmatic high-mass gamma-ray binary which hosts a powerful O6.5V companion, but the nature of the compact object is still to be established using multi-wavelength observations.
Methods: We analyzed phase-resolved multi-instrument spectra of nonthermal emission from LS 5039 in order to produce reliable spectral models…
Possible substellar companions in dwarf eclipsing binaries. SDSS J143547.87+373338.5, NSVS 7826147, and NSVS 14256825
Merc, J.; Wolf, M.; Zejda, M. +4 more
We present the new results of our long-term observational project to detect the small variations in the orbital periods of low-mass and short-period eclipsing binaries. About 120 new precise mid-eclipse times were obtained for three relatively well-known dwarf eclipsing binaries: SDSS J143547.87+373338.5 (P = 0.126 d), NSVS 07826147 (0.162 d), and…