Search Publications
The spectroscopic evolution of the recurrent nova T Pyxidis during its 2011 outburst. II. The optically thin phase and the structure of the ejecta in recurrent novae
Sion, E. M.; Shore, S. N.; Starrfield, S. +4 more
Aims: We continue our study of the physical properties of the recurrent nova T Pyx, focussing on the structure of the ejecta in the nebular stage of expansion during the 2011 outburst.
Methods: The nova was observed contemporaneously with the Nordic Optical Telescope (NOT), at high resolution spectroscopic resolution (R ≈ 65 000) on 2011…
AKARI North Ecliptic Pole Deep Survey. Revision of the catalogue via a new image analysis
Małek, K.; Ohyama, Y.; Pearson, C. +10 more
Context. We present the revised near- to mid-infrared catalogue of the AKARI North Ecliptic Pole deep survey. The survey has the unique advantage of continuous filter coverage from 2 to 24 µm over nine photometric bands, but the initial version of the survey catalogue leaves room for improvement in the image analysis stage; the original imag…
CoRoT 102918586: a γ Doradus pulsator in a short-period eccentric eclipsing binary
Gandolfi, D.; Rainer, M.; Montalbán, J. +2 more
Pulsating stars in eclipsing binary systems are powerful tools to test stellar models. Binarity enables us to constrain the pulsating component's physical parameters and this knowledge drastically improves the input physics for asteroseismic studies. The study of stellar oscillations then allows us to improve our understanding of stellar interiors…
Deuterated water in the solar-type protostars NGC 1333 IRAS 4A and IRAS 4B
Codella, C.; Ceccarelli, C.; van Dishoeck, E. F. +19 more
Context. The measure of the water deuterium fractionation is a relevant tool for understanding mechanisms of water formation and evolution from the prestellar phase to the formation of planets and comets.
Aims: The aim of this paper is to study deuterated water in the solar-type protostars NGC 1333 IRAS 4A and IRAS 4B, to compare their HDO ab…
The 69 µm forsterite band in spectra of protoplanetary disks. Results from the Herschel DIGIT programme
Waters, L. B. F. M.; Dominik, C.; Henning, Th. +13 more
Context. We have analysed far-infrared spectra of 32 circumstellar disks around Herbig Ae/Be and T Tauri stars obtained within the Herschel key programme Dust, Ice and Gas in Time (DIGIT). The spectra were taken with the Photodetector Array Camera and Spectrometer (PACS) on board the Herschel Space Observatory. In this paper we focus on the detect…
Dynamics of the solar atmosphere above a pore with a light bridge
Heinzel, P.; Jurčák, J.; Berrilli, F. +3 more
Context. Solar pores are small sunspots lacking a penumbra that have a prevailing vertical magnetic-field component. They can include light bridges at places with locally reduced magnetic field. Like sunspots, they exhibit a wide range of oscillatory phenomena.
Aims: A large isolated pore with a light bridge (NOAA 11005) is studied to obtain …
OTS 44: Disk and accretion at the planetary border
Liu, Y.; Bayo, A.; Wolf, S. +4 more
We discover that the very low-mass brown dwarf OTS 44 (M9.5, ~12 MJup) has significant accretion and a substantial disk, which demonstrates that the processes that accompany canonical star formation occur down to a central mass of a few Jupiter masses. We discover in VLT/SINFONI spectra that OTS 44 has strong, broad, and variable Pa β e…
Protostars, multiplicity, and disk evolution in the Corona Australis region: a Herschel Gould Belt Study
Eiroa, C.; White, G. J.; Henning, T. +4 more
Context. The CrA region and the Coronet cluster form a nearby (138 pc), young (1-2 Myr) star-forming region that hosts a moderate population of Class I, II, and III objects.
Aims: We study the structure of the cluster and the properties of the protostars and protoplanetary disks in the region.
Methods: We present Herschel PACS photometry…
Observational evidence for dissociative shocks in the inner 100 AU of low-mass protostars using Herschel-HIFI
van Dishoeck, E. F.; Benz, A. O.; Bruderer, S. +3 more
Aims: Herschel-HIFI spectra of H2O towards low-mass protostars show a distinct velocity component not seen in observations from the ground of CO or other species. The aim is to characterise this component in terms of excitation conditions and physical origin.
Methods: A velocity component with an offset of ~10 km s-1
Discovery of the magnetic field in the pulsating B star β Cephei
Talavera, A.; Donati, J. -F.; Kaper, L. +17 more
Context. Although the star itself is not helium enriched, the periodicity and the variability in the UV wind lines of the pulsating B1 IV star β Cephei are similar to what is observed in magnetic helium-peculiar B stars, suggesting that β Cep is magnetic.
Aims: We searched for a magnetic field using high-resolution spectropolarimetry. From UV…