Search Publications
Spatial variation of the cooling lines in the reflection nebula NGC 7023
Abergel, A.; White, G. J.; Lebouteiller, V. +7 more
Context. The north-west photo-dissociation region (PDR) in the reflection nebula NGC 7023 displays a complex structure. Filament-like condensations at the edge of the cloud can be traced via the emission of the main cooling lines, offering a great opportunity to study the link between the morphology and energetics of these regions.
Aims: We s…
Background subtraction and transient timing with Bayesian Blocks
Schwope, A. D.; Worpel, H.
Aims: We aim to incorporate background subtraction into the Bayesian Blocks algorithm so that transient events can be timed accurately and precisely even in the presence of a substantial, rapidly variable background.
Methods: We developed several modifications to the algorithm and tested them on a simulated XMM-Newton observation of a bu…
Doppler-shift oscillations in the H I Lyα coronal emission line: spectroscopic signature of propagating kink waves?
Raymond, J. C.; Mancuso, S.
We report the first detection of long-period, slowly decaying Doppler-shift oscillations in the H i Lyα (1215.67 Å) coronal emission line with the Ultraviolet Coronagraph Spectrometer (UVCS) onboard the Solar and Heliospheric Observatory (SOHO) satellite. The UV spectral data were collected at 1.43 R⊙ above the eastern limb of the Sun d…
Wavelet analysis of CME, X-ray flare, and sunspot series
Pereira, E. S.; Guedes, M. R. G.; Cecatto, J. R.
Context. Coronal mass ejections (CMEs) and solar flares are the most energetic transient phenomena taking place at the Sun. Together they are principally responsible for disturbances in outer geospace. Coronal mass ejections and solar flares are believed to be correlated with the solar cycle, which is mainly characterized by sunspot numbers.
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Herschel/PACS view of disks around low-mass stars and brown dwarfs in the TW Hydrae association
Herczeg, Gregory J.; Kraus, Adam L.; Shkolnik, Evgenya L. +6 more
We conducted Herschel/PACS observations of five very low-mass stars or brown dwarfs located in the TW Hya association with the goal of characterizing the properties of disks in the low stellar mass regime. We detected all five targets at 70 µm and 100 µm and three targets at 160 µm. Our observations, combined with previous photom…
Three-micron extinction of the Titan haze in the 250-700 km altitude range: Possible evidence of a particle-aging process
Bar-Nun, Akiva; Kim, Sang Joon; Courtin, Régis
Context. The chemical nature of the Titan haze is poorly understood. The investigation carried out by the Cassini-Huygens suite of instruments is bringing new insights into this question.
Aims: This work aims at deriving the vertical variation of the spectral structure of the 3.3-3.4 µm absorption feature of the Titan haze from Cassini …
The Araucaria project. Precise physical parameters of the eclipsing binary IO Aquarii
Anderson, R. I.; Maxted, P. F. L.; Pollacco, D. +11 more
Aims: Our aim is to precisely measure the physical parameters of the eclipsing binary IO Aqr and derive a distance to this system by applying a surface brightness - colour relation. Our motivation is to combine these parameters with future precise distance determinations from the Gaia space mission to derive precise surface brightness - colou…
Characterization of OSIRIS NAC filters for the interpretation of multispectral data of comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lamy, P. L.; Lara, L. M. +39 more
Context. We interpret multicolor data from OSIRISNAC for the remote-sensing exploration of comet 67P/Churyumov-Gerasimenko.
Aims: We determine the most meaningful definition of color maps for the characterization of surface variegation with filters available on OSIRIS NAC.
Methods: We analyzed laboratory spectra of selected minerals and …
870 µm continuum observations of the bubble-shaped nebula Gum 31
Rubio, M.; Firpo, V.; Cappa, C. E. +4 more
Aims: We present here a study of the cold dust in the close environs of the ring nebula Gum 31. We aim at deriving the physical properties of the molecular gas and dust associated with the nebula, and investigating its correlation with the star formation in the region, which was probably triggered by the expansion of the ionization front agai…
A metal-rich elongated structure in the core of the group NGC 4325
Lovisari, L.; Schellenberger, G.; Laganá, T. F. +3 more
Aims: Based on XMM-Newton, Chandra, and optical DR10-SDSS data, we investigate the metal enrichment history of the group NGC 4325 (z = 0.026). To complete the analysis we used chemical evolution models and studied the optical spectrum of the central dominant galaxy through its stellar population analysis and emission line diagnostics to analy…