Search Publications
Disk evolution in the solar neighborhood. I. Disk frequencies from 1 to 100 Myr
Bouy, Hervé; Merín, Bruno; Ribas, Álvaro +1 more
Aims: We study the evolution of circumstellar disks in 22 young (1 to 100 Myr) nearby (within 500 pc) associations over the entire mass spectrum using photometry covering from the optical to the mid-infrared.
Methods: We compiled a catalog of 2340 spectroscopically-confirmed members of these nearby associations. We analyzed their spectra…
Gas structure inside dust cavities of transition disks: Ophiuchus IRS 48 observed by ALMA
van Dishoeck, Ewine F.; van der Marel, Nienke; Bruderer, Simon +1 more
Context. Transition disks are recognized by the absence of emission of small dust grains inside a radius of up to several 10s of AUs. Owing to the lack of angular resolution and sensitivity, the gas content of these dust holes has not yet been determined, but is of importance for constraining the mechanism leading to the dust holes. It is thought …
Gas and dust in the beta Pictoris moving group as seen by the Herschel Space Observatory
Pinte, C.; Duchêne, G.; Dent, W. R. F. +11 more
Context. Debris discs are thought to be formed through the collisional grinding of planetesimals, and then can be considered as the outcome of planet formation. Understanding the properties of gas and dust in debris discs can help us comprehend the architecture of extrasolar planetary systems. Herschel Space Observatory far-infrared (IR) photometr…
Characterization of the gaseous companion κ Andromedae b. New Keck and LBTI high-contrast observations
Kuzuhara, M.; Tamura, M.; Ishii, M. +67 more
Context. We previously reported the direct detection of a low-mass companion at a projected separation of 55 ± 2 AU around the B9-type star κ Andromedae. The properties of the system (mass ratio, separation) make it a benchmark for understanding the formation and evolution of gas giant planets and brown dwarfs on wide orbits.
Aims: We present…
Optical - near-infrared catalog for the AKARI north ecliptic pole Deep field
Goto, Tomotsugu; Ohyama, Youichi; Pearson, Chris +9 more
Aims: We present an 8-band (u∗, g', r', i', z', Y, J, Ks) optical to near-infrared deep photometric catalog based on the observations made with MegaCam and WIRCam at the CFHT, and compute photometric redshifts, zp in the north ecliptic pole (NEP) region. AKARI infrared satellite carried out a deep survey in th…
Gas lines from the 5-Myr old optically thin disk around HD 141569A . Herschel observations and modeling
Pinte, C.; Ménard, F.; Woitke, P. +20 more
Context. The gas- and dust dissipation processes in disks around young stars remain uncertain despite numerous studies. At the distance of ~99-116 pc, HD 141569A is one of the nearest HerbigAe stars that is surrounded by a tenuous disk, probably in transition between a massive primordial disk and a debris disk. Atomic and molecular gases have been…
IPHAS and the symbiotic stars. III. New discoveries and their IR spectral energy distributions
Munari, U.; Corradi, R. L. M.; Santander-García, M. +5 more
Context. The IPHAS Hα survey provides a rich database to search for emission-line sources in the northern Galactic plane.
Aims: We are systematically searching for symbiotic stars in the Milky Way using IPHAS. Our final goal, a complete census of this class of objects in the Galaxy, is a fundamental figure for discussing their overall propert…
The yellow hypergiant HR 5171 A: Resolving a massive interacting binary in the common envelope phase
Smith, N.; Meilland, A.; Millour, F. +20 more
Context. Only a few stars are caught in the very brief and often crucial stages when they quickly traverse the Hertzsprung-Russell diagram, and none has yet been spatially resolved in the mass transfer phase.
Aims: We initiated long-term optical interferometry monitoring of the diameters of massive and unstable yellow hypergiants (YHG) with t…
V838 Monocerotis: the central star and its environment a decade after outburst
Meilland, A.; Millour, F.; Chesneau, O. +8 more
Aims: V838 Monocerotis erupted in 2002, brightened in a series of outbursts, and eventually developed a spectacular light echo. A very red star emerged a few months after the outburst. The whole event has been interpreted as the result of a merger.
Methods: We obtained near- and mid-IR interferometric observations of
Polycyclic aromatic hydrocarbon feature deficit of starburst galaxies in the AKARI North Ecliptic Pole Deep field
Inami, H.; Armus, L.; Serjeant, S. +6 more
We study the behaviour of polycyclic aromatic hydrocarbon (PAH) emission in galaxies at z = 0.3-1.4 using 1868 samples from the revised catalogue of AKARI North Ecliptic Pole Deep survey. The continuous filter coverage at 2-24 µm makes it possible to measure 8 µm luminosity, which is dominated by PAH emission, for galaxies at up to z =…