Search Publications
When binaries keep track of recent nucleosynthesis. The Zr-Nb pair in extrinsic stars as an s-process diagnostic
Jorissen, A.; Escorza, A.; Masseron, T. +9 more
Context. Barium stars are s-process enriched giants. They owe their chemical peculiarities to a past mass transfer phase. During this phase they were polluted by their binary companion, which at the time was an asymptotic giant branch (AGB) star, but is now an extinct white dwarf. Barium stars are thus ideal targets for understanding and constrain…
The dense cores and filamentary structure of the molecular cloud in Corona Australis: Herschel SPIRE and PACS observations from the Herschel Gould Belt Survey
White, G. J.; André, Ph.; Arzoumanian, D. +16 more
We present a catalogue of prestellar and starless cores within the Corona Australis molecular cloud using photometric data from the Herschel Space Observatory. At a distance of d 130 pc, Corona Australis is one of the closest star-forming regions. Herschel has taken multi-wavelength data of Corona Australis with both the Spectral and Photometric I…
Testing modified-gravity theories via wide binaries and GAIA
Sutherland, Will; Pittordis, Charalambos
The standard Lambda cold dark matter model based on general relativity (GR) including cold dark matter (DM) is very successful at fitting cosmological observations, but recent non-detections of candidate dark matter particles mean that various modified-gravity theories remain of significant interest. The latter generally involve modifications to G…
On the Faint End of the Galaxy Luminosity Function in the Epoch of Reionization: Updated Constraints from the HST Frontier Fields
Castellano, M.; Di Criscienzo, M.; Santini, P. +12 more
Ultra-faint galaxies are hosted by small dark matter halos with shallow gravitational potential wells, hence their star formation activity is more sensitive to feedback effects. The shape of the faint end of the high-z galaxy luminosity function (LF) contains important information on star formation and its interaction with the reionization process…
Observations of the Proton Aurora on Mars With SPICAM on Board Mars Express
Rodriguez, L.; Montmessin, F.; Ritter, B. +2 more
We report observations of the proton aurora at Mars, obtained with the Spectroscopy for the Investigation of the Characteristics of the Atmosphere of Mars (SPICAM) ultraviolet spectrograph on board Mars Express between 2004 and 2011. This is a third type of UV aurora that is discovered on Mars, in addition to the discrete and diffuse nightside aur…
The Radial Velocity Variability of the K-giant γ Draconis: Stellar Variability Masquerading as a Planet
Dreizler, S.; Hatzes, A. P.; Cochran, W. D. +9 more
We present precise stellar radial velocity (RV) measurements of γ Dra taken from 2003 to 2017. The data from 2003 to 2011 show coherent, long-lived variations with a period of 702 days. These variations are consistent with the presence of a planetary companion having m sin i = 10.7 M Jup whose orbital properties are typical for giant pl…
The Carnegie-Irvine Galaxy Survey. VI. Quantifying Spiral Structure
Ho, Luis C.; Barth, Aaron J.; Yu, Si-Yue +1 more
The Carnegie-Irvine Galaxy Survey provides high-quality broadband optical images of a large sample of nearby galaxies for detailed study of their structure. To probe the physical nature and possible cosmological evolution of spiral arms, a common feature of many disk galaxies, it is important to quantify their main characteristics. We describe rob…
The Peculiar Radial Distribution of Multiple Populations in the Massive Globular Cluster M80
Dalessandro, E.; Salaris, M.; Vesperini, E. +7 more
We present a detailed analysis of the radial distribution of light-element multiple populations (LE-MPs) in the massive and dense globular cluster M80, based on a combination of UV and optical Hubble Space Telescope data. Surprisingly, we find that first-generation (FG) stars (FG) are significantly more centrally concentrated than extreme second-g…
A new catalogue of Galactic novae: investigation of the MMRD relation and spatial distribution
Güver, Tolga; Özdönmez, Aykut; Ege, Ergün +1 more
In this study, a new Galactic novae catalogue is introduced collecting important parameters of these sources such as their light-curve parameters, classifications, full width half-maximum (FWHM) of Hα line, distances and interstellar reddening estimates. The catalogue is also published on a website with a search option via a SQL query and an onlin…
Tensions between direct measurements of the lens power spectrum from Planck data
Hu, Wayne; Motloch, Pavel
We apply a recently developed method to directly measure the gravitational lensing power spectrum from CMB power spectra to the Planck satellite data. This method allows us to analyze the tension between the temperature power spectrum and lens reconstruction in a model-independent way. Even when allowing for arbitrary variations in the lensing pow…