Search Publications
Hayabusa-2 mission target asteroid 162173 Ryugu (1999 JU3): Searching for the object's spin-axis orientation
Altieri, B.; Greiner, J.; Schady, P. +27 more
The JAXA Hayabusa-2 mission was approved in 2010 and launched on December 3, 2014. The spacecraft will arrive at the near-Earth asteroid 162173 Ryugu (1999 JU3) in 2018 where it will perform a survey, land and obtainsurface material, then depart in December 2019 and return to Earth in December 2020. We observed Ryugu with the Herschel S…
3D shape of asteroid (6) Hebe from VLT/SPHERE imaging: Implications for the origin of ordinary H chondrites
Berthier, J.; Carry, B.; Delbo, M. +15 more
Context. The high-angular-resolution capability of the new-generation ground-based adaptive-optics camera SPHERE at ESO VLT allows us to assess, for the very first time, the cratering record of medium-sized (D 100-200 km) asteroids from the ground, opening the prospect of a new era of investigation of the asteroid belt's collisional history.
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A mid-IR interferometric survey with MIDI/VLTI: resolving the second-generation protoplanetary disks around post-AGB binaries
Waters, L. B. F. M.; Debosscher, J.; de Wit, W. -J. +7 more
Aims: We present a mid-IR interferometric survey of the circumstellar environment of a specific class of post-asymptotic giant branch (post-AGB) binaries. For this class the presence of a compact dusty disk has been postulated on the basis of various spatially unresolved measurements. The aim is to determine the angular extent of the N-band e…
Luminosities and infrared excess in Type II and anomalous Cepheids in the Large and Small Magellanic Clouds
Groenewegen, M. A. T.; Jurkovic, M. I.
Type II and anomalous Cepheids (ACs) are useful distance indicators when there are too few classical Cepheids or when RR Lyrae stars are too faint. Type II and ACs follow a period-luminosity relation as well, but they are less well-studied classes of objects. In this paper we study the sample of 335 Type II and ACs in the Small and Large Magellani…
A star formation study of the ATLAS3D early-type galaxies with the AKARI all-sky survey
Kaneda, H.; Murata, K.; Yamagishi, M. +4 more
Context. The star formation properties of early-type galaxies (ETGs) are currently the subject of considerable interest, particularly whether they differ from the star formation properties of gas-rich spirals.
Aims: We perform a systematic study of star formation in a large sample of local ETGs with polycyclic aromatic hydrocarbon (PAH) and d…
[Ultra] luminous infrared galaxies selected at 90 µm in the AKARI deep field: a study of AGN types contributing to their infrared emission
Buat, V.; Małek, K.; Burgarella, D. +6 more
Aims: The aim of this work is to characterize physical properties of ultra luminous infrared galaxies (ULIRGs) and luminous infrared galaxies (LIRGs) detected in the far-infrared (FIR) 90 µm band in the AKARI Deep Field-South (ADF-S) survey. In particular, we want to estimate the active galactic nucleus (AGN) contribution to the LIRGs a…
Faint warm debris disks around nearby bright stars explored by AKARI and IRSF
Inutsuka, Shu-ichiro; Onaka, Takashi; Kaneda, Hidehiro +5 more
Context. Debris disks are important observational clues for understanding planetary-system formation process. In particular, faint warm debris disks may be related to late planet formation near 1 au. A systematic search of faint warm debris disks is necessary to reveal terrestrial planet formation.
Aims: Faint warm debris disks show excess em…
A search for pre- and proto-brown dwarfs in the dark cloud Barnard 30 with ALMA
Ménard, F.; de Gregorio-Monsalvo, I.; Eiroa, C. +9 more
Context. The origin of brown dwarfs is still under debate. While some models predict a star-like formation scenario, others invoke a substellar mass embryo ejection, a stellar disk fragmentation, or the photo-evaporation of an external core due to the presence of massive stars.
Aims: The aim of our work is to characterize the youngest and low…
Millimeter observations of the disk around GW Orionis
Fedele, D.; Wang, Y.; Wang, J. Z. +4 more
The GW Ori system is a pre-main sequence triple system (GW Ori A/B/C) with companions (GW Ori B/C) at 1 AU and 8 AU, respectively, from the primary (GW Ori A). The primary of the system has a mass of 3.9 M⊙, but shows a spectral type of G8. Thus, GW Ori A could be a precursor of a B star, but it is still at an earlier evolutionary stage…
New eruptive variable in the massive star-forming region associated with IRAS 18507+0121
Nikoghosyan, E. H.; Azatyan, N. M.; Khachatryan, K. G.
Aims: We report the discovery of a strong outburst of the embedded young stellar object (YSO) UKIDSS-J185318.36+012454.5, located in the star-forming region associated with IRAS 18507+0121 and the ultra-compact H II region GAL 034.4+00.23.
Methods: Using archival photometric data and images, we determined the amplitude and the epoch of t…