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Circumstellar disks around Herbig Be stars
T. Alonso-Albi, A. Fuente, R. Bachiller +5
We completed a search for circumstellar disks around Herbig Be stars using the NRAO Very Large Array (VLA) and the IRAM Plateau de Bure (PdB) interferometers. We present our new VL…
Phase Closure Image Reconstruction for Future VLTI Instrumentation
Mercedes E. Filho, Stephanie Renard, Paulo Garcia +21
Classically, optical and near-infrared interferometry have relied on closure phase techniques to produce images. Such techniques allow us to achieve modest dynamic ranges. In order…
Phase Referencing in Optical Interferometry
Mercedes E. Filho, Paulo Garcia, Gilles Duvert +20
One of the aims of next generation optical interferometric instrumentation is to be able to make use of information contained in the visibility phase to construct high dynamic rang…
The origin of hydrogen line emission for five Herbig Ae/Be stars spatially resolved by VLTI/AMBER spectro-interferometry
S. Kraus, K. -H. Hofmann, M. Benisty +14
To trace the accretion and outflow processes around YSOs, diagnostic spectral lines such as the BrG 2.166 micron line are widely used, although due to a lack of spatial resolution,…
VSI: the VLTI spectro-imager
F. Malbet, D. Buscher, G. Weigelt +51
The VLTI Spectro Imager (VSI) was proposed as a second-generation instrument of the Very Large Telescope Interferometer providing the ESO community with spectrally-resolved, near-i…
The star formation in the L1615/L1616 cometary cloud
Davide Gandolfi, Juan M. Alcalá, Silvio Leccia +6
The present work aims at performing a comprehensive census and characterisation of the pre-main sequence (PMS) population in the cometary cloud L1615/L1616, in order to assess the…
Spatially resolving the hot CO around the young Be star 51 Ophiuchi
E. Tatulli, F. Malbet, F. Menard +6
51 Oph is one of the few young Be stars displaying a strong CO overtone emission at 2.3 microns in addition to the near infrared excess commonly observed in this type of stars. In…
Spitzer IRAC and MIPS Imaging of Clusters and Outflows in 9 High-mass Star Forming Regions
Keping Qiu, Qizhou Zhang, S. Thomas Megeath +6
We present Spitzer Space Telescope IRAC and MIPS observations toward a sample of nine high-mass star forming regions at a distance of around 2 kpc. Based on IRAC and MIPS 24 m p…
The pre-ZAMS nature of Mol160/IRAS23385+6053 confirmed by Spitzer
S. Molinari, F. Faustini, L. Testi +3
Determining the timeline for the formation of massive YSOs requires the identification and characterisation of all the phases that a massive forming YSO undergoes. It is of particu…
Molecular hydrogen in the circumstellar environments of Herbig Ae/Be stars probed by FUSE
C. Martin-Zaidi, M. Deleuil, J. Le Bourlot +7
We observed molecular hydrogen around a sample of pre-main sequence stars in order to better characterize their gaseous CS environments. We analyzed the FUSE (Far Ultraviolet Spect…
Gas and dust in the inner disk of the Herbig Ae star MWC 758
A. Isella, E. Tatulli, A. Natta +1
In this Letter we investigate the origin of the near-infrared emission of the Herbig Ae star MWC 758 on sub-astronomical unit (AU) scales using spectrally dispersed low resolution…
The dusty disk around VV Ser
T. Alonso-Albi, A. Fuente, R. Bachiller +3
We have carried out observations at millimeter and centimeter wavelengths towards VV Ser using the Plateau de Bure Interferometer and the Very Large Array. This allows us to comput…
Accretion properties of T Tauri stars in sigma Ori
T. Gatti, A. Natta, S. Randich +2
Accretion disks around young stars evolve in time with time scales of few million years. We present here a study of the accretion properties of a sample of 35 stars in the ~3 milli…
Milli-arcsecond astrophysics with VSI, the VLTI spectro-imager in the ELT era
F. Malbet, D. Buscher, G. Weigelt +49
Nowadays, compact sources like surfaces of nearby stars, circumstellar environments of stars from early stages to the most evolved ones and surroundings of active galactic nuclei c…
Brown dwarfs and very low mass stars in the Hyades cluster : a dynamically evolved mass function
J. Bouvier, T. T. Kendall, G. Meeus +9
We conducted a search for brown dwarfs (BDs) and very low mass (VLM) stars in the 625 Myr-old Hyades cluster in order to derive the cluster's mass function across the stellar-subst…
IRAS 18511+0146: a proto Herbig Ae/Be cluster?
S. Vig, L. Testi, M. Walmsley +3
Context: The evolution of a young protocluster depends on the relative spatial distributions and dynamics of both stars and gas. Aims: We study the distribution and properties of t…
Millimeter imaging of HD 163296: probing the disk structure and kinematics
A. Isella, L. Testi, A. Natta +3
We present new multi-wavelength millimeter interferometric observations of the Herbig Ae star HD 163296 obtained with the IRAM/PBI, SMA and VLA arrays both in continuum and in the…
Discovery of a Bipolar Outflow from 2MASSW J1207334-393254, A 24 Jupiter Mass Brown Dwarf
E. T. Whelan, T. P. Ray, S. Randich +5
The 24 M Jupiter mass brown dwarf 2MASS1207-3932 has for some time been known to show clear signs of classical T Tauri-like accretion. Through analysis of its oxygen forbidden emis…
New 13CO observations towards the Keplerian gaseous disk around R Mon
T. Alonso-Albi, A. Fuente, R. Bachiller +4
We present new high angular resolution observations of the 13CO 1-0 rotational line towards the HBe star R Mon, obtained with the IRAM Bure Interferometer, along with the previous…
Infall of gas as the formation mechanism of stars up to 20 times more massive than the Sun
Maria T. Beltran, Riccardo Cesaroni, Claudio Codella +3
Theory predicts and observations confirm that low-mass stars (like the Sun) in their early life grow by accreting gas from the surrounding material. But for stars ~ 10 times more m…
Accretion in rho-Ophiuchi brown dwarfs: infrared hydrogen line ratios
T. Gatti, L. Testi, A. Natta +2
Mass accretion rate determinations are fundamental for an understanding of the evolution of pre-main sequence star circumstellar disks. Magnetospheric accretion models are used to…
Accretion Rates in Herbig Ae stars
R. Garcia Lopez, A. Natta, L. Testi +1
Accretion rates from disks around pre-main sequence stars are of importance for our understanding of planetary formation and disk evolution. We provide in this paper estimates of t…
Searching for massive pre--stellar cores through observations of N2H+ and N2D+
F. Fontani, P. Caselli, A. Crapsi +4
We have measured the deuterium fractionation (through the column density ratio N(N2D+)/N(N2H+)) and the CO depletion factor (ratio between expected and observed CO abundance) in a…
Constraining the wind launching region in Herbig Ae stars: AMBER/VLTI spectroscopy of HD104237
E. Tatulli, A. Isella, A. Natta +3
We investigate the origin of the emission of the Herbig Ae star HD104237 on Astronomical Unit (AU) scales. Using AMBER/VLTI at a spectral resolution R=1500 spatially…