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Gravity field and solar component of the precession rate and nutation coefficients of Comet 67P/Churyumov-Gerasimenko
Souchay, J.; Lhotka, C.; Reimond, S. +1 more
The aim of this study is first to determine the gravity field of the comet 67P/Churyumov-Gerasimenko and second to derive the solar component of the precession rate and nutation coefficients of the spin-axis of the comet nucleus, I.e. without the direct, usually larger, effect of outgassing. The gravity field and related moments of inertia are obt…
The nuclear dust lane of Circinus: collimation without a torus
Tristram, K. R. W.; Prieto, M. A.; Fernández-Ontiveros, J. A. +1 more
In some AGN, nuclear dust lanes connected to kpc-scale dust structures provide all the extinction required to obscure the nucleus, challenging the role of the dusty torus proposed by the Unified Model. In this letter, we show the pc-scale dust and ionized gas maps of Circinus constructed using sub-arcsec-accuracy registration of infrared VLT AO im…
Properties of the dust in the coma of 67P/Churyumov-Gerasimenko observed with VIRTIS- M
Erard, S.; Piccioni, G.; Bieler, A. +16 more
An investigation is presented of the dust scattering in the coma of 67P/Churyumov-Gerasimenko for the dates of 2015 February 28, March 15 and April 27. A comparison of the morphology of dust continuum maps at 1.1 µm and gas emission shows that for the above dates the spatial distribution of the dust is strongly correlated with H2O…
On the detectability of CO molecules in the interstellar medium via X-ray spectroscopy
García, Javier A.; Kallman, Timothy R.; Gatuzz, Efraín +1 more
We present a study of the detectability of CO molecules in the Galactic interstellar medium using high-resolution X-ray spectra obtained with the XMM-Newton Reflection Grating Spectrometer. We analysed 10 bright low mass X-ray binaries (LMXBs) to study the CO contribution in their line of sights. A total of 25 observations were fitted with the <…
The mass-loss rates of red supergiants at low metallicity: detection of rotational CO emission from two red supergiants in the Large Magellanic Cloud
Matsuura, Mikako; Barlow, M. J.; Meixner, Margaret +9 more
Using the PACS and SPIRE spectrometers on-board the Herschel Space Observatory, we obtained spectra of two red supergiants (RSGs) in the Large Magellanic Cloud (LMC). Multiple rotational CO emission lines (J = 6-5 to 15-14) and 15 H2O lines were detected from IRAS 05280-6910, and one CO line was detected from WOH G64. This is the first …
Masses of the components of SB2s observed with Gaia - II. Masses derived from PIONIER interferometric observations for Gaia validation
Mazeh, T.; Grellmann, R.; Tal-Or, L. +15 more
In anticipation of the Gaia astrometric mission, a sample of spectroscopic binaries is being observed since 2010 with the Spectrograph pour l'Observation des PHénomènes des Intérieurs stellaires et des Exoplanètes (SOPHIE) spectrograph at the Haute-Provence Observatory. Our aim is to derive the orbital elements of double-lined spectroscopic binari…
IR excesses around nearby Lambda Boo stars are caused by debris discs rather than ISM bow waves
Wyatt, M. C.; Venn, K. A.; Matthews, B. C. +3 more
Lambda Boo stars are predominately A-type stars with solar abundant C, N, O, and S, but up to 2 dex underabundances of refractory elements. The stars' unusual surface abundances could be due to a selective accretion of volatile gas over dust. It has been proposed that there is a correlation between the Lambda Boo phenomenon and IR excesses which a…
Numerical predictions for planets in the debris discs of HD 202628 and HD 207129
Maddison, S. T.; Thilliez, E.
Resolved debris disc images can exhibit a range of radial and azimuthal structures, including gaps and rings, which can result from planetary companions shaping the disc by their gravitational influence. Currently, there are no tools available to determine the architecture of potential companions from disc observations. Recent work by Rodigas, Mal…
Finest light curve details, physical parameters, and period fluctuations of CoRoT RR Lyrae stars
Derekas, A.; Szabó, R.; Sódor, Á. +1 more
The CoRoT satellite supplied the scientific community with a huge data base of variable stars. Among them the RR Lyrae stars have intensively been discussed in numerous papers in the last few years, but the latest runs have not been checked to find RR Lyrae stars up to now. Our main goal was to fill this gap and complete the CoRoT RR Lyrae sample.…
X-rays associated with the jet-cloud-interacting radio galaxy 3C 277.3 (Coma A): implications for energy deposition
Young, A. J.; Birkinshaw, M.; Worrall, D. M.
We report the discovery with Chandra of X-ray-emitting gas associated with the jet-cloud interaction in the radio galaxy 3C 277.3 (Coma A), a source that falls in the most important power range for radio-mode feedback in the Universe. This hot gas, heated by the jet, dominates the mass of the cloud which is responsible for an extreme projected def…