567 citations · 3.2k across the 40 of their papers we have counts for
26 papers · 1 filter
A VLT/CRIRES+ study of helium 1.083m absorption features towards the inner Orion Nebula
Thomas J. Haworth, Mark McCaughrean, Mario van den Ancker +3
JWST NIRCam F115W observations towards the inner Orion Nebula revealed a diverse array of previously unknown dark features. The most likely cause was absorption or suppressed emiss…
HD 152384: A 5 Myr old debris disk system showing a gaseous ring of refractory elements at the dust sublimation radius
Mario van den Ancker, Daniela Iglesias, Olja Panić +2
Context: Circumstellar gas around young stars provides key insights into planet formation and disk evolution. HD 152384, a young (5 Myr) A0 V star in Sco-Cen, shows hybrid-disk tra…
X-Shooter Survey of Young Intermediate Mass Stars -- I. Stellar Characterization and Disc Evolution
Daniela P. Iglesias, Olja Panić, Mario van den Ancker +6
Intermediate mass stars (IMSs) represent the link between low-mass and high-mass stars and cover a key mass range for giant planet formation. In this paper, we present a spectrosco…
Multi-epoch, high spatial resolution observations of multiple T Tauri systems
Gergely Csépány, Mario van den Ancker, Péter Ábrahám +4
Context. In multiple pre-main-sequence systems the lifetime of circumstellar disks appears to be shorter than around single stars, and the actual dissipation process may depend on…
A spectroscopic survey of Herbig Ae/Be stars with X-Shooter II: Accretion diagnostic lines
John R Fairlamb, Rene D Oudmaijer, Ignacio Mendigutia +2
The Herbig Ae/Be stars (HAeBes) allow an exploration of the properties of Pre-Main Sequence(PMS) stars above the low-mass range () and those bordering…
A gas density drop in the inner 6 AU of the transition disk around the Herbig Ae star HD 139614: Further evidence for a giant planet inside the disk?
A. Carmona, W. F. Thi, I. Kamp +16
Context: Quantifying the gas content inside the dust gaps of transition disks is important to establish their origin. Aims: We seek to constrain the surface density of warm gas in…
Variability in the CO ro-vibrational lines from HD163296
Rosina P. Hein Bertelsen, I. Kamp, G. van der Plas +4
We present for the first time a direct comparison of multi-epoch (2001-2002 and 2012) CO ro-vibrational emission lines from HD163296. We find that both the line shapes and the FWHM…
Spectroscopy and Linear Spectropolarimetry of the early Herbig Be Stars PDS 27 and PDS 37
K. M. Ababakr, J. R. Fairlamb, R. D. Oudmaijer +1
The number of well-studied early-type pre-main-sequence objects is very limited, hampering the study of massive star formation from an observational point of view. Here, we present…
A spectroscopic survey of Herbig Ae/Be stars with X-Shooter I: Stellar parameters and accretion rates
J. R. Fairlamb, R. D. Oudmaijer, I. Mendigutía +2
Herbig Ae/Be stars span a key mass range that links low and high mass stars, and thus provide an ideal window from which to explore their formation. This paper presents VLT/X-Shoot…
Examining the T Tauri system with SPHERE
Gergely Csépány, Mario van den Ancker, Péter Ábrahám +2
Context. The prototypical low-mass young stellar object, T Tauri, is a well-studied multiple system with at least three components. Aims. We aim to explore the T Tau system with th…
On the asymmetry of the OH ro-vibrational lines in HD 100546
D. Fedele, S. Bruderer, M. E. van den Anckerm +1
We present multi-epoch high-spectral resolution observations with VLT/CRIRES of the OH doublet P4.5 (1+,1-) (2.934 m) towards the protoplanetary disk around HD 10054…
The structure of disks around Herbig Ae/Be stars as traced by CO ro-vibrational emission
G. van der Plas, M. E. van den Ancker, L. B. F. M. Waters +1
We study the emission and absorption of CO ro-vibrational lines in the spectra of intermediate mass pre-main-sequence stars with the aim to determine both the spatial distribution…
Investigating the inner discs of Herbig Ae/Be stars with CO bandhead and Br Gamma emission
John D. Ilee, John Fairlamb, Rene D. Oudmaijer +4
Herbig Ae/Be stars lie in the mass range between low and high mass young stars, and therefore offer a unique opportunity to observe any changes in the formation processes that may…
Stellar parameters and accretion rate of the transition disk star HD 142527 from X-Shooter
I. Mendigutía, J. Fairlamb, B. Montesinos +4
HD 142527 is a young pre-main sequence star with properties indicative of the presence of a giant planet or/and a low-mass stellar companion. We have analyzed an X-Shooter/Very Lar…
Identifying gaps in flaring Herbig Ae/Be disks using spatially resolved mid-infrared imaging. Are all group I disks transitional?
K. M. Maaskant, M. Honda, L. B. F. M. Waters +6
*Context The evolution of young massive protoplanetary disks toward planetary systems is expected to include the formation of gaps and the depletion of dust and gas. *Aims A specia…
HD 144432: a young triple system
A. Mueller, A. Carmona, M. E. van den Ancker +3
We present new imaging and spectroscopic data of the young Herbig star HD 144432 A, which was known to be a binary star with a separation of 1.47 arcsec. High-resolution NIR imagin…
A survey for near-infrared H2 emission in Herbig Ae/Be stars: emission from the outer disks of HD 97048 and HD 100546
A. Carmona, G. van der Plas, M. E. van den Ancker +5
We report on a sensitive search for H2 1-0 S(1), 1-0 S(0) and 2-1 S(1) ro-vibrational emission at 2.12, 2.22 and 2.25 micron in a sample of 15 Herbig Ae/Be stars employing CRIRES,…
Near-infrared spectroscopy of EX Lupi in outburst
Á. Kóspál, P. Ábrahám, M. Goto +6
EX Lup is the prototype of the EXor class of young eruptive stars: objects showing repetitive brightenings due to increased accretion from the circumstellar disk to the star. In th…
HD 135344B: a young star has reached its rotational limit
André Müller, Mario van den Ancker, Ralf Launhardt +3
We search for periodic variations in the radial velocity of the young Herbig star HD 135344B with the aim to determine a rotation period. We analyzed 44 high-resolution optical spe…
Fundamental Vibrational Transition of CO during the Outburst of EX Lupi in 2008
M. Goto, Zs. Regály, C. P. Dullemond +16
We report monitoring observations of the T Tauri star EX Lupi during its outburst in 2008 in the CO fundamental band at 4.6-5.0 um. The observations were carried out at the VLT and…
Dust evolution in protoplanetary disks around Herbig Ae/Be stars - The Spitzer view
A. Juhasz, J. Bouwman, Th. Henning +7
In this paper we present mid-infrared spectra of a comprehensive set of Herbig Ae/Be stars observed with the Spitzer Space Telescope. The signal-to-noise ratio of these spectra is…
Spitzer's view on aromatic and aliphatic hydrocarbon emission in Herbig Ae stars
B. Acke, J. Bouwman, A. Juhash +5
The chemistry of astronomical hydrocarbons, responsible for the well-known infrared emission features detected in a wide variety of targets, remains enigmatic. Here we focus on the…
New Herbig Ae/Be stars confirmed via high-resolution optical spectroscopy
A. Carmona, M. E. van den Ancker, M. Audard +3
We present FEROS high-resolution (R~45000) optical spectroscopy of 34 Herbig Ae/Be star candidates with previously unknown or poorly constrained spectral types. Within the sample,…
HD 95881: A gas rich to gas poor transition disk?
A. P. Verhoeff, M. Min, B. Acke +8
Context. Based on the far infrared excess the Herbig class of stars is divided into a group with flaring circumstellar disks (group I) and a group with flat circumstellar disks (gr…