Search Publications
Kuiper belt analogues in nearby M-type planet-host systems
Eiroa, C.; Marshall, J. P.; Ardila, D. +6 more
We present the results of a Herschel survey of 21 late-type stars that host planets discovered by the radial velocity technique. The aims were to discover new discs in these systems and to search for any correlation between planet presence and disc properties. In addition to the known disc around GJ 581, we report the discovery of two new discs, i…
Circumnuclear star formation in Mrk 42 mapped with Gemini Near-infrared Integral Field Spectrograph
Colina, Luis; Storchi-Bergmann, Thaisa; Riffel, Rogemar A. +3 more
We present Gemini Near-infrared Integral Field Spectrograph (NIFS) observations of the inner 1.5 × 1.5 kpc2 of the narrow-line Seyfert 1 galaxy Mrk 42 at a spatial resolution of 60 pc and spectral resolution of 40 km s^{-1}. The emission-line flux and equivalent width maps clearly show a ring of circumnuclear star formation regions surr…
A low-mass eclipsing binary within the fully convective zone from the Next Generation Transit Survey
Bouchy, F.; Queloz, D.; Smith, A. M. S. +22 more
We have discovered a new, near-equal-mass, eclipsing M dwarf binary from the Next Generation Transit Survey. This system is only one of three field-age (>1 Gyr), late M dwarf eclipsing binaries known, and has a period of 1.74774 d, similar to that of CM Dra and KOI126. Modelling of the eclipses and radial velocities shows that the component mas…
The coordinated radio and infrared survey for high-mass star formation - IV. A new radio-selected sample of compact galactic planetary nebulae
Umana, G.; Lumsden, S. L.; Zijlstra, A. A. +6 more
We present a new radio-selected sample of PNe from the CORNISH survey. This is a radio continuum survey of the inner Galactic plane covering Galactic longitude, 10° < l < 65° and latitude, |b| < 1° with a resolution of 1.5 arcsec and sensitivity better than 0.4 mJy beam-1. The radio regime, being unbiased by dust extinction, al…
New Galactic star clusters discovered in the disc area of the VVVX survey
Minniti, D.; Chené, A. -N.; Hempel, M. +9 more
The `VISTA Variables in the Vía Láctea eXtended (VVVX)' ESO Public Survey is a near-infrared photometric sky survey that covers nearly 1700 deg2 towards the Galactic disc and bulge. It is well-suited to search for new open clusters, hidden behind dust and gas. The pipeline processed and calibrated KS-band tile images of 40 pe…
A deep X-ray view of the bare AGN Ark 120. III. X-ray timing analysis and multiwavelength variability
Grosso, N.; Porquet, D.; Reeves, J. N. +3 more
We present the spectral/timing properties of the bare Seyfert galaxy Ark 120 through a deep ∼420 ks XMM-Newton campaign plus recent NuSTAR observations and a ∼6-month Swift monitoring campaign. We investigate the spectral decomposition through fractional rms, covariance and difference spectra, finding the mid- to long-time-scale (∼day-year) variab…
Hall effect in the coma of 67P/Churyumov-Gerasimenko
Altwegg, K.; Huang, Z.; Jia, X. +8 more
Magnetohydrodynamics simulations have been carried out in studying the solar wind and cometary plasma interactions for decades. Various plasma boundaries have been simulated and compared well with observations for comet 1P/Halley. The Rosetta mission, which studies comet 67P/Churyumov-Gerasimenko, challenges our understanding of the solar wind and…
Spotting stellar activity cycles in Gaia astrometry
Hawley, Suzanne L.; Davenport, James R. A.; Agol, Eric +1 more
Astrometry from Gaia will measure the positions of stellar photometric centroids to unprecedented precision. We show that the precision of Gaia astrometry is sufficient to detect starspot-induced centroid jitter for nearby stars in the Tycho-Gaia Astrometric Solution (TGAS) sample with magnetic activity similar to the young G-star KIC 7174505 or t…
Stellar pulsation and granulation as noise sources in exoplanet transit spectroscopy in the ARIEL space mission
Vandenbussche, Bart; Pascale, Enzo; Argyriou, Ioannis +2 more
Stellar variability from pulsations and granulation presents a source of correlated noise that can impact the accuracy and precision of multiband photometric transit observations of exoplanets. This can potentially cause biased measurements in the transmission or emission spectrum or underestimation of the final error bars on the spectrum. ARIEL i…
Parallaxes of Southern Extremely Cool objects III: 118 L and T dwarfs
Sozzetti, A.; Lattanzi, M. G.; Bucciarelli, B. +17 more
We present new results from the Parallaxes of Southern Extremely Cool dwarfs program to measure parallaxes, proper motions and multiepoch photometry of L and early T dwarfs. The observations were made on 108 nights over the course of 8 yr using the Wide Field Imager on the ESO 2.2m telescope. We present 118 new parallaxes of L and T dwarfs of whic…