Search Publications
Galactic cold cores. III. General cloud properties
Bernard, J. -P.; Falgarone, E.; Juvela, M. +15 more
Context. In the project galactic cold cores we are carrying out Herschel photometric observations of cold regions of the interstellar clouds as previously identified with the Planck satellite. The aim of the project is to derive the physical properties of the population of cold clumps and to study its connection to ongoing and future star formatio…
Herschel images of Fomalhaut. An extrasolar Kuiper belt at the height of its dynamical activity
Ivison, R. J.; Fridlund, M.; Blommaert, J. A. D. L. +33 more
Context. Fomalhaut is a young (2 ± 1 × 108 years), nearby (7.7 pc), 2 M⊙ star that is suspected to harbor an infant planetary system, interspersed with one or more belts of dusty debris.
Aims: We present far-infrared images obtained with the Herschel Space Observatory with an angular resolution between 5.7'' and 36.7'' a…
3D simulations of Betelgeuse's bow shock
Langer, N.; Mohamed, S.; Mackey, J.
Betelgeuse, the bright, cool red supergiant in Orion, is moving supersonically relative to the local interstellar medium. The star emits a powerful stellar wind that collides with this medium, forming a cometary structure, a bow shock, pointing in the direction of motion. We present the first 3D hydrodynamic simulations of the formation and evolut…
Modelling the huge, Herschel-resolved debris ring around HD 207129
Magain, P.; Krivov, A. V.; Eiroa, C. +18 more
Debris disks, which are inferred from the observed infrared excess to be ensembles of dust, rocks, and probably planetesimals, are common features of stellar systems. As the mechanisms of their formation and evolution are linked to those of planetary bodies, they provide valuable information. The few well-resolved debris disks are even more valuab…
AKARI observations of ice absorption bands towards edge-on young stellar objects
Tamura, M.; Kandori, R.; Pontoppidan, K. M. +9 more
Context. Circumstellar disks and envelopes of low-mass young stellar objects (YSOs) contain significant amounts of ice. Such icy material will evolve to become volatile components of planetary systems, such as comets in our solar system.
Aims: To investigate the composition and evolution of circumstellar ice around low-mass young stellar obje…
Transient dust in warm debris disks. Detection of Fe-rich olivine grains
Mutschke, H.; Ábrahám, P.; Henning, Th. +4 more
Context. Debris disks trace remnant reservoirs of leftover planetesimals in planetary systems. In the past years, a handful of "warm" debris disks have been discovered in which emission in excess starts in the mid-infrared. An interesting subset of these warm debris disks shows emission features in mid-infrared spectra, which points towards the pr…
A DEBRIS disk around the planet hosting M-star GJ 581 spatially resolved with Herschel
Duchêne, G.; Dent, W. R. F.; Bryden, G. +17 more
Debris disks have been found primarily around intermediate and solar mass stars (spectral types A-K) but rarely around low mass M-type stars. We have spatially resolved a debris disk around the remarkable M3-type star GJ 581 hosting multiple planets using deep PACS images at 70, 100 and 160 µm as part of the DEBRIS Program on the Herschel Sp…
Accretion-related properties of Herbig Ae/Be stars. Comparison with T Tauris
Eiroa, C.; Montesinos, B.; Mora, A. +4 more
Context. The mass accretion rate M⊙;acc) is a key parameter that has not accurately been determined for a wide sample of Herbig Ae/Be (HAeBe) stars until recently.
Aims: We look for trends relating M⊙acc and the stellar ages (t), spectral energy distributions (SEDs), and disk masses for a sample of 38 HAeBe stars, compar…
The AKARI NEP-Deep survey: a mid-infrared source catalogue
Im, M.; Lee, H. M.; White, G. J. +13 more
We present a new catalogue of mid-IR sources using the AKARI NEP-Deep survey. The InfraRed Camera (IRC) onboard AKARI has a comprehensive mid-IR wavelength coverage with 9 photometric bands at 2-24 µm. We utilized all of these bands to cover a nearly circular area adjacent to the north ecliptic pole (NEP). We designed the catalogue to includ…
The North Ecliptic Pole Wide survey of AKARI: a near- and mid-infrared source catalog
Im, M.; Lee, H. M.; White, G. J. +19 more
We present a photometric catalog of infrared (IR) sources based on the North Ecliptic Pole Wide field (NEP-Wide) survey of AKARI, which is an infrared space telescope launched by Japan. The NEP-Wide survey covered 5.4 deg2 area, a nearly circular shape centered on the NEP, using nine photometric filter-bands from 2-25 µm of the In…