Search Publications
Atmospheric thermal structure and cloud features in the southern hemisphere of Venus as retrieved from VIRTIS/VEX radiation measurements
Kappel, D.; Arnold, G.; Haus, R.
Thermal structure and cloud features in the atmosphere of Venus are investigated using spectroscopic nightside measurements recorded by the Visible and InfraRed Thermal Imaging Spectrometer (VIRTIS) aboard ESA’s Venus Express mission in the moderate resolution infrared mapping channel (M-IR, 1-5 µm). New methodical approaches and retrieval r…
Feeding and feedback in the inner kiloparsec of the active galaxy NGC 2110
Robinson, Andrew; Schnorr-Müller, Allan; Storchi-Bergmann, Thaisa +4 more
We present two-dimensional gaseous kinematics of the inner 1.1 × 1.6 kpc2 of the Seyfert 2 galaxy NGC 2110, from optical spectra (5600-7000 Å) obtained with the Gemini Multi Object Spectrograph integral field spectrograph on the Gemini South telescope at a spatial resolution of ≈100 pc. Gas emission is observed over the whole field of v…
Clouds on the Hot Jupiter HD189733b: Constraints from the Reflection Spectrum
Aigrain, S.; Fletcher, L. N.; Irwin, P. G. J. +4 more
The hot Jupiter HD 189733b is probably the best studied of the known extrasolar planets, with published transit and eclipse spectra covering the near UV to mid-IR range. Recent work on the transmission spectrum has shown clear evidence for the presence of clouds in its atmosphere, which significantly increases the model atmosphere parameter space …
New Detections of Arsenic, Selenium, and Other Heavy Elements in Two Metal-poor Stars
Beers, Timothy C.; Roederer, Ian U.; Frebel, Anna +6 more
We use the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope to obtain new high-quality spectra covering the 1900 <=λ <= 2360 Å wavelength range for two metal-poor stars, HD 108317 and HD 128279. We derive abundances of Cu II, Zn II, As I, Se I, Mo II, and Cd II, which have not been detected previously in either star. …
Long-period intensity pulsations in the solar corona during activity cycle 23
Auchère, F.; Bocchialini, K.; Solomon, J. +1 more
We report on the detection (10σ) of 917 events of long-period (3 to 16 h) intensity pulsations in the 19.5 nm passband of the SOHO Extreme ultraviolet Imaging Telescope. The data set spans from January 1997 to July 2010, i.e. the entire solar cycle 23 and the beginning of cycle 24. The events can last for up to six days and have relative amplitude…
"TNOs are Cool": A survey of the trans-Neptunian region. XI. A Herschel-PACS view of 16 Centaurs
Fornasier, S.; Lellouch, E.; Kiss, C. +13 more
Context. Centaurs are the transitional population between trans-Neptunian objects (TNOs) and Jupiter-family comets. Their physical properties provide an insight into TNO properties, but only under restricted conditions since Centaurs are closer to the Sun and Earth. For this reason it is possible to access the smaller ones, which is more difficult…
The many sides of RCW 86: a Type Ia supernova remnant evolving in its progenitor's wind bubble
Vink, Jacco; Bamba, Aya; Chiotellis, Alexandros +1 more
We present the results of a detailed investigation of the Galactic supernova remnant RCW 86 using the XMM-Newton X-ray telescope. RCW 86 is the probable remnant of SN 185 A.D., a supernova that likely exploded inside a wind-blown cavity. We use the XMM-Newton Reflection Grating Spectrometer to derive precise temperatures and ionization ages of the…
An independent determination of Fomalhaut b's orbit and the dynamical effects on the outer dust belt
Augereau, J. -C.; Ertel, S.; Lebreton, J. +7 more
Context. The nearby star Fomalhaut harbors a cold, moderately eccentric (e ~ 0.1) dust belt with a sharp inner edge near 133 au. A low-mass, common proper motion companion, Fomalhaut b (Fom b), was discovered near the inner edge and was identified as a planet candidate that could account for the belt morphology. However, the most recent orbit dete…
The Corona of HD 189733 and its X-Ray Activity
Günther, H. M.; Sciortino, S.; Drake, J. J. +5 more
Testing whether close-in massive exoplanets (hot Jupiters) can enhance the stellar activity in their host primary is crucial for the models of stellar and planetary evolution. Among systems with hot Jupiters, HD 189733 is one of the best studied because of its proximity, strong activity, and the presence of a transiting planet, which allows transm…
Herschel-ATLAS: modelling the first strong gravitational lenses
Ivison, R. J.; Smith, M.; Cooray, A. +14 more
We have determined the mass density radial profiles of the first five strong gravitational lens systems discovered by the Herschel Astrophysical Terahertz Large Area Survey. We present an enhancement of the semilinear lens inversion method of Warren & Dye which allows simultaneous reconstruction of several different wavebands and apply this to…