Search Publications
Classifying the embedded young stellar population in Perseus and Taurus and the LOMASS database
van Dishoeck, E. F.; Mottram, J. C.; Jørgensen, J. K. +3 more
Context. The classification of young stellar objects (YSOs) is typically done using the infrared spectral slope or bolometric temperature, but either can result in contamination of samples. More accurate methods to determine the evolutionary stage of YSOs will improve the reliability of statistics for the embedded YSO population and provide more r…
The X-ray light curve of the massive colliding wind Wolf-Rayet + O binary WR 21a
Nazé, Yaël; Gosset, Eric
Our dedicated XMM-Newton monitoring, as well as archival Chandra and Swift datasets, were used to examine the behaviour of the WN5h+O3V binary WR 21a at high energies. For most of the orbit, the X-ray emission exhibits few variations. However, an increase in strength of the emission is seen before periastron, following a 1 /D relative trend, where…
Millimeter and submillimeter excess emission in M 33 revealed by Planck and LABOCA
Boquien, M.; Kramer, C.; Relaño, M. +6 more
Context. Previous studies have shown the existence of an excess of emission at submillimeter (submm) and millimeter (mm) wavelengths in the spectral energy distribution (SED) of many low-metallicity galaxies. The so-called "submm excess", whose origin remains unknown, challenges our understanding of the dust properties in low-metallicity environme…
The SOPHIE search for northern extrasolar planets. XI. Three new companions and an orbit update: Giant planets in the habitable zone
Bouchy, F.; Deleuil, M.; Moutou, C. +25 more
We report the discovery of three new substellar companions to solar-type stars, HD 191806, HD 214823, and HD 221585, based on radial velocity measurements obtained at the Haute-Provence Observatory. Data from the SOPHIE spectrograph are combined with observations acquired with its predecessor, ELODIE, to detect and characterise the orbital paramet…
An alternative validation strategy for the Planck cluster catalogue and y-distortion maps
Khatri, Rishi
We present an all-sky map of the y-type distortion calculated from the full mission Planck High Frequency Instrument (HFI) data using the recently proposed approach to component separation, which is based on parametric model fitting and model selection. This simple model-selection approach enables us to distinguish between carbon monoxide (CO) lin…
Allsky NICER and NICEST extinction maps based on the 2MASS near-infrared survey
Juvela, M.; Montillaud, J.
Context. Extinction remains one of the most reliable methods of measuring column density of nearby Galactic interstellar clouds. The current and ongoing near-infrared surveys enable the mapping of extinction over large sky areas.
Aims: We produce allsky extinction maps using the 2MASS near-infrared survey.
Methods: We use the NICER and N…
Observational signatures of past mass-exchange episodes in massive binaries: The case of HD 149 404
Martins, F.; Gosset, E.; Nazé, Y. +4 more
Context. Mass and momentum exchanges in close massive binaries play an important role in their evolution, and produce several observational signatures such as asynchronous rotation and altered chemical compositions, that remain after the stars detach again.
Aims: We investigated these effects for the detached massive O-star binary HD 149 404 …
Size growth of red-sequence early-type galaxies in clusters in the last 10 Gyr
Andreon, S.; Dong, Hui; Raichoor, A.
We carried out a photometric and structural analysis in the rest-frame V band of a mass-selected (log M/M⊙> 10.7) sample of red-sequence galaxies in 14 galaxy clusters, 6 of which are at z> 1.45, namely JKCS041, IDCS J1426.5+3508, SpARCS104922.6+564032.5, SpARCSJ021524-034331, XDCPJ0044.0-2033, and SPT-CLJ2040-4451. To this end, w…
The SOPHIE search for northern extrasolar planets. VIII. Follow-up of ELODIE candidates: long-period brown-dwarf companions
Bouchy, F.; Moutou, C.; Queloz, D. +29 more
Long-period brown dwarf companions detected in radial velocity surveys are important targets for direct imaging and astrometry to calibrate the mass-luminosity relation of substellar objects. Through a 20-yr radial velocity monitoring of solar-type stars that began with ELODIE and was extended with SOPHIE spectrographs, giant exoplanets and brown …
The extinction and dust-to-gas structure of the planetary nebula NGC 7009 observed with MUSE
Walsh, J. R.; Barlow, M. J.; Monreal-Ibero, A. +3 more
Context. Dust plays a significant role in planetary nebulae. Dust ejected with the gas in the asymptotic giant branch (AGB) phase is subject to the harsh environment of the planetary nebula (PN) while the star is evolving towards a white dwarf. Dust surviving the PN phase contributes to the dust content of the interstellar medium.
Aims: The m…