Astronomy

Probing the Structure of the Accretion Region in a Sample of Magnetic Herbig Ae/Be Stars
We present the results of a study of the temporal behaviour of severaldiagnostic lines formed in the region of the accretion-disk/star interaction inthe three magnetic Herbig Ae stars HD101412, HD104237, and HD190073. More than100 spectra acquired with the ISAAC, X-shooter, and CRIRES spectrographsinstalled at the VLT-8m telescope (ESO, Chile), as well as at otherobservatories (OHP, Crimean AO)...


The Contribution of Millisecond Pulsars to the Galactic Cosmic-Ray Lepton Spectrum
Pulsars are believed to be sources of relativistic electrons and positrons. The abundance of detections of gamma-ray millisecond pulsars by Fermi LargeArea Telescope coupled with their light curve characteristics that implycopious pair production in their magnetospheres, motivated us to investigatethis old pulsar population as a source of Galactic electrons and positrons andtheir contribution t...
Ultraluminous Infrared Galaxies in the AKARI All Sky Survey
We present a new catalog of 118 Ultraluminous Infrared Galaxies (ULIRGs) andone Hyperluminous Infrared Galaxy (HLIRG) by crossmatching AKARI all-sky surveywith the Sloan Digital Sky Survey Data Release 10 (SDSS DR10) and the FinalData Release of the Two-Degree Field Galaxy Redshift Survey (2dFGRS). 40 of theULIRGs and one HLIRG are new identifications. We find that ULIRGs areinteracting pair ga...


Star formation around the mid-infrared bubble CN 148
We present a multi-wavelength study to analyse the star formation processassociated with the mid-infrared bubble CN 148 (H II region G10.3-0.1), whichharbors an O5V-O6V star. The arc-shaped distribution of molecular CO(2-1)emission, the cold dust emission, and the polycyclic aromatic hydrocarbonfeatures trace a photodissociation region (PDR) around the H II region. We haveidentified 371 young s...
Stellar parameters and chemical abundances of 223 evolved stars with and without planets
We present fundamental stellar parameters and chemical abundances for asample of 86 evolved stars with planets and for a control sample of 137 starswithout planets. The analysis was based on both high S/N and resolution echellespectra. The goals of this work are i) to investigate chemical differencesbetween stars with and without planets; ii) to explore potential differencesbetween the properti...


The Gaia-ESO Survey: {alpha}-abundances of metal-poor stars
We performed a detailed study of the ratio of low-{alpha} to high-{alpha}stars in the Galactic halo as observed by the Gaia-ESO Survey. Using a sampleof 381 metal-poor stars from the second internal data release, we found thatthe value of this ratio did not show evidence of systematic trends as afunction of metallicity, surface gravity, Galactic latitude, Galacticlongitude, height above the Gal...
Multiwavelength observations of Mrk 501 in 2008
Mrk 501 is one of the brightest blazars at TeV energies and has beenextensively studied since its first VHE detection in 1996. Our goal is tocharacterize in detail the source gamma-ray emission, together with theradio-to-X-ray emission, during the non-flaring (low) activity, which is lessoften studied than the occasional flaring (high) activity. We organized amultiwavelength (MW) campaign on Mr...

The K2-TESS Stellar Properties Catalog
We introduce a catalog of stellar properties for stars observed by the Keplerfollow-on mission, K2. We base the catalog on a cross-match between the K2Campaign target lists and the current working version of the NASA TESS targetcatalog. The resulting K2-TESS Stellar Properties Catalog includes value-addedinformation from the TESS Target Catalog, including stellar colors, propermotions, and an e...
Chemical modeling of water deuteration in IRAS16293-2422
Iras 16293-2422 is a well studied low-mass protostar characterized by astrong level of deuterium fractionation. In the line of sight of theprotostellar envelope, an additional absorption layer, rich in singly anddoubly deuterated water has been discovered by a detailed multiline analysis ofHDO. To model the chemistry in this source, the gas-grain chemical codeNautilus has been used with an exte...

Constraining the shaping mechanism of the Red Rectangle through spectro-polarimetry of its central star
We carried out high-sensitivity spectropolarimetric observations of thecentral star of the Red Rectangle proto-planetary nebula with the aim ofconstraining the mechanism that gives its biconical shape. The stellar light ofthe central binary system is linearly polarised since it is scattered on thedust particles of the nebula. Surprisingly, the linear polarisation in thecontinuum is aligned with...
Three WASP-South transiting exoplanets: WASP-74b, WASP-83b & WASP-89b
We report the discovery of three new transiting hot Jupiters by WASP-Southtogether with the TRAPPIST photometer and the Euler/CORALIE spectrograph. WASP-74b orbits a star of V = 9.7, making it one of the brighter systemsaccessible to Southern telescopes. It is a 0.95 M_Jup planet with a moderatelybloated radius of 1.5 R_Jup in a 2-d orbit around a slightly evolved F9 star. WASP-83b is a Saturn-...

Pore evolution in interstellar ice analogues: simulating the effects of temperature increase
The level of porosity of interstellar ices - largely comprised ofamorphous solid water (ASW) - contains clues on the trapping capacity of othervolatile species and determines the surface accessibility that is needed forsolid state reactions to take place. Our goal is to simulate the growthof amorphous water ice at low temperature (10 K) and to characterize theevolution of the porosity (and the ...
Is PLANCK consistent with primordial deuterium measurements ?
The recent measurements of the Cosmic Microwave Anisotropiesprovided by the Planck satellite experiment have significantly improved theconstraints on several cosmological parameters. In this brief paper we pointout a small but interesting tension present between recent values of theprimordial deuterium measured from quasar absorption line systems and the samevalue inferred, albeit indirectly, f...
Extended HCN and HCO$^{+}$ emission in the starburst galaxy M82
We mapped 3 mm continuum and line emission from the starburst galaxy M82using the Combined Array for Research in Millimeter-wave Astronomy. We targetedthe HCN, HCO$^{+}$, HNC, CS and HC$_{3}$N lines, but here we focus on the HCNand HCO$^{+}$ emission. The map covers a field of 1.2' with a ~5" resolution. The HCN and HCO$^{+}$ observations are combined with single dish images. Themolecular gas i...
The almost ubiquitous association of 6.7 GHz methanol masers with dust
We report the results of 870-$mu$m continuum observations, using the LargeAPEX Bolometer Camera (LABOCA), towards 77 class-II, 6.7-GHz methanol masersidentified by the Methanol Multibeam (MMB) survey to map the thermal emissionfrom cool dust towards these objects. These data complement a study of 630methanol masers associated with compact dense clumps identified from theATLASGAL survey. Compact...