Search Publications
Modelling the structure and kinematics of the Firework nebula: The nature of the GK Persei nova shell and its jet-like feature
Boumis, P.; Akras, S.; Harvey, E. +1 more
Aims: The shaping mechanisms of old nova remnants are probes for several important and unexplained processes, such as dust formation and the structure of evolved star nebulae. To gain a more complete understanding of the dynamics of the GK Per (1901) remnant, an examination of symmetry of the nova shell is explored, followed by a kinematical …
ATCA observations of the MACS-Planck Radio Halo Cluster Project. I. New detection of a radio halo in PLCK G285.0-23.7
Brunetti, G.; Aghanim, N.; Douspis, M. +12 more
Aims: We investigate the possible presence of diffuse radio emission in the intermediate redshift, massive cluster PLCK G285.0-23.7 (z = 0.39, M500 = 8.39 × 1014M⊙).
Methods: Our 16 cm-band ATCA observations of PLCK G285.0-23.7 allow us to reach a rms noise level of 11 µJy/beam on the wide-band (1.1…
Deep ALMA imaging of the merger NGC 1614. Is CO tracing a massive inflow of non-starforming gas?
Gallagher, J. S.; Xu, C. K.; Evans, A. +4 more
Aims: Observations of the molecular gas over scales of ~0.5 to several kpc provide crucial information on how molecular gas moves through galaxies, especially in mergers and interacting systems, where it ultimately reaches the galaxy center, accumulates, and feeds nuclear activity. Studying the processes involved in the gas transport is one o…
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 …