Search Publications
The relation between Lyα absorbers and local galaxy filaments
Richter, P.; Wendt, M.; Bouma, S. J. D.
Context. The intergalactic medium (IGM) is believed to contain the majority of baryons in the universe and to trace the same dark matter structure as galaxies, forming filaments and sheets. Lyα absorbers, which sample the neutral component of the IGM, have been extensively studied at low and high redshift, but the exact relation between Lyα absorp…
Linking ice and gas in the λ Orionis Barnard 35A cloud
Pontoppidan, K. M.; Rocha, W. R. M.; Bjerkeli, P. +5 more
Context. Dust grains play an important role in the synthesis of molecules in the interstellar medium, from the simplest species, such as H2, to complex organic molecules. How some of these solid-state molecules are converted into gas-phase species is still a matter of debate.
Aims: Our aim is to directly compare ice and gas abundan…
New-generation dust emission templates for star-forming galaxies
Boquien, Médéric; Salim, Samir
Context. The infrared (IR) emission of dust heated by stars provides critical information for galaxy evolution studies. Unfortunately, observations are often limited to the mid-IR, making templates a necessity. Previously published templates were based on small samples of luminous galaxies, which are not necessarily representative of normal star-f…
Neglected X-ray discovered polars. III. RX J0154.0-5947, RX J0600.5-2709, RX J0859.1+0537, RX J0953.1+1458, and RX J1002.2-1925
Burwitz, V.; Beuermann, K.; Schwope, A. +2 more
We report results on the ROSAT-discovered noneclipsing short-period polars RX J0154.0-5947, RX J0600.5-2709, RX J0859.1+0537, RX J0953.1+1458, and RX J1002.2-1925 collected over 30 years. We present accurate linear orbital ephemerides that allow a correct phasing of data taken decades apart. Three of the systems show cyclotron and Zeeman lines tha…
Sr and Ba abundances: Comparing machine-learning with star-by-star analyses. High-resolution re-analysis of suspected LAMOST barium stars
Jorissen, A.; Escorza, A.; Van Winckel, H. +6 more
Context. A new large sample of 895 s-process-rich candidates out of 454 180 giant stars surveyed by LAMOST at a low spectral resolution (R ~ 1800) has been reported by Norfolk et al. (2019, MNRAS, 490, 2219; hereafter N19).
Aims: This study is aimed at confirming the s-process enrichment at the higher resolution (R ~ 86 000) offered by the HE…
Evidence for stellar contamination in the transmission spectra of HAT-P-12b
Pallé, E.; Yan, F.; Chen, G. +4 more
Context. Transmission spectroscopy characterizes the wavelength dependence of transit depth, revealing atmospheric absorption features in planetary terminator regions. In this context, different optical transmission spectra of HAT-P-12b reported in previous studies exhibited discrepant atmospheric features (e.g., Rayleigh scattering and alkali abs…
A neural network-based methodology to select young stellar object candidates from IR surveys
Montillaud, J.; Cornu, D.
Context. Observed young stellar objects (YSOs) are used to study star formation and characterize star-forming regions. For this purpose, YSO candidate catalogs are compiled from various surveys, especially in the infrared (IR), and simple selection schemes in color-magnitude diagrams (CMDs) are often used to identify and classify YSOs.
Aims: …
Multi-instrument analysis of far-ultraviolet aurora in the southern hemisphere of comet 67P/Churyumov-Gerasimenko
Feldman, P. D.; Eriksson, A.; Biver, N. +9 more
Aims: We aim to determine whether dissociative excitation of cometary neutrals by electron impact is the major source of far-ultraviolet (FUV) emissions at comet 67P/Churyumov-Gerasimenko in the southern hemisphere at large heliocentric distances, both during quiet conditions and impacts of corotating interaction regions observed in the summe…
12C/13C ratio and CNO abundances in the classical very old metal-poor dwarf HD 140283
Spite, M.; Barbuy, B.; Spite, F.
Context. The isotope abundances provide powerful diagnostics of the chemical enrichment in our Galaxy. The star HD 140283 is one of the best-studied very metal-poor dwarf stars. It is very old, and the chemical abundance in this star is a good witness of the chemical composition of the matter in the early Galaxy.
Aims: The aim of this work is…
Multifrequency high spectral resolution observations of HCN toward the circumstellar envelope of Y Canum Venaticorum
Santander-García, M.; Cernicharo, J.; Greathouse, T. K. +7 more
High spectral resolution observations toward the low mass-loss rate C-rich, J-type asymptotic giant branch (AGB) star Y CVn were carried out at 7.5, 13.1, and 14.0 µm with the Echelon-cross-echelle Spectrograph mounted on the Stratospheric Observatory for Infrared Astronomy and the Texas Echelon-cross-echelle Spectrograph on the Infrared Tel…