Search Publications
Spatially resolved mid-infrared observations of the triple system T Tauri
Wolf, S.; Ábrahám, P.; Henning, Th. +6 more
Aims: The aim of this study is to enhance our knowledge of the characteristics and distribution of the circumstellar dust associated with the individual components of the young hierarchical triple system T Tau.
Methods: To reach this goal, observations in the N-band (8-13 µm) with the two-telescope interferometric instrument MIDI at the …
A binary engine fuelling HD 87643's complex circumstellar environment. Determined using AMBER/VLTI imaging
Waters, L. B. F. M.; Weigelt, G.; Hofmann, K. -H. +19 more
Context: The star HD 87643, exhibiting the “B[e] phenomenon”, has one of the most extreme infrared excesses for this object class. It harbours a large amount of both hot and cold dust, and is surrounded by an extended reflection nebula.
Aims: One of our major goals was to investigate the presence of a companion in HD87643. In addition, the pre…
EX Lupi in quiescence
Ábrahám, P.; Kóspál, Á.; Kun, M. +5 more
Aims: EX Lupi is the prototype of EXors, a subclass of low-mass pre-main sequence stars whose episodic eruptions are attributed to temporarily increased accretion. In quiescence the optical and near-infrared properties of EX Lup cannot be distinguished from those of normal T Tau stars. Here we investigate whether it is the circumstellar disk struc…
The possible role of vortex shedding in the excitation of kink-mode oscillations in the solar corona
Nakariakov, V. M.; Aschwanden, M. J.; van Doorsselaere, T.
We propose a model for the excitation of horizontally polarised transverse (kink) magnetoacoustic oscillations of solar coronal loops by upflows associated with coronal mass ejections. If the magnetic field in the plasma that is dragged in the vertical direction by the flow is parallel to the loop, the phenomenon of vortex shedding causes the appe…
A robust morphological classification of high-redshift galaxies using support vector machines on seeing limited images. II. Quantifying morphological k-correction in the COSMOS field at 1 < z < 2: Ks band vs. I band
Rouan, D.; Sanders, D. B.; Salvato, M. +10 more
Context: Morphology is the most accessible tracer of galaxies physical structure, but its interpretation in the framework of galaxy evolution still remains problematic. Its quantification at high redshift requires deep high-angular resolution imaging, which is why space data (HST) are usually employed. At z > 1, the HST visible cameras however …
Transiting exoplanets from the CoRoT space mission. VII. The ``hot-Jupiter''-type planet CoRoT-5b
Mazeh, T.; Aigrain, S.; Alonso, R. +43 more
Aims: The CoRoT space mission continues to photometrically monitor about 12 000 stars in its field-of-view for a series of target fields to search for transiting extrasolar planets ever since 2007. Deep transit signals can be detected quickly in the “alarm-mode” in parallel to the ongoing target field monitoring. CoRoT's first planets have been de…
Planetary companions around the K giant stars 11 Ursae Minoris and HD 32518
Guenther, E. W.; Pasquini, L.; Hatzes, A. P. +2 more
Context: 11 UMi and HD 32518 belong to a sample of 62 K giant stars that has been observed since February 2004 using the 2m Alfred Jensch telescope of the Thüringer Landessternwarte (TLS) to measure precise radial velocities (RVs).
Aims: The aim of this survey is to investigate the dependence of planet formation on the mass of the host star by…
Timing of the 2008 outburst of SAX J1808.4-3658 with XMM-Newton: a stable orbital-period derivative over ten years
Papitto, A.; Burderi, L.; D'Aì, A. +4 more
We report on a timing analysis performed on a 62-ks long XMM-Newton observation of the accreting millisecond pulsar SAX J1808.4-3658 during the latest X-ray outburst that started on September 21, 2008. By connecting the time of arrivals of the pulses observed during the XMM-Newton observation, we derived the best-fit orbital solution and a best-fi…
Radio and X-ray study of two multi-shell supernova remnants: Kes 79 and G352.7-0.1
Giacani, E.; Paron, S.; Smith, M. J. S. +3 more
Aims: We investigate two multi-shell galactic supernova remnants (SNRs), Kes 79, and G352.7-0.1, to understand the causes of this morphology.
Methods: The research was carried out based on new and reprocessed archival VLA observations and XMM-Newton archival data. The surrounding gas was investigated based on data extracted from the HI Canadia…
Absorption line indices in the UV. I. Empirical and theoretical stellar population models
Thomas, D.; Bender, R.; Maraston, C. +1 more
Aims: Stellar absorption lines in the optical (e.g. the Lick system) have been extensively studied and constitute an important stellar population diagnostic for galaxies in the local universe and up to moderate redshifts. Proceeding towards higher look-back times, galaxies are younger and the ultraviolet becomes the relevant spectral region where …