Search Publications
Stellar multiplicity and debris discs: an unbiased sample
Duchêne, Gaspard; Greaves, Jane; Matthews, Brenda +4 more
Circumstellar dust discs have been observed around many nearby stars. However, many stars are part of binary or multiple stellar systems. A natural question arises regarding the presence and properties of such discs in systems with more than one star. To address this, we consider a sample of 449 systems (spectral types A-M) observed with the Hersc…
Interhemispheric differences in ionospheric convection: Cluster EDI observations revisited
Haaland, S.; Förster, M.
The interaction between the interplanetary magnetic field and the geomagnetic field sets up a large-scale circulation in the magnetosphere. This circulation is also reflected in the magnetically connected ionosphere. In this paper, we present a study of ionospheric convection based on Cluster Electron Drift Instrument (EDI) satellite measurements …
Titan's atmosphere as observed by Cassini/VIMS solar occultations: CH4, CO and evidence for C2H6 absorption
Nicholson, Philip D.; Maltagliati, Luca; Bézard, Bruno +6 more
We present an analysis of the VIMS solar occultations dataset, which allows us to extract vertically resolved information on the characteristics of Titan's atmosphere between ∼100 and 700 km with a vertical resolution of ∼10 km. After a series of data treatment procedures to correct problems in pointing stability and parasitic light, 4 occultation…
Jet-ISM Interaction in the Radio Galaxy 3C 293: Jet-driven Shocks Heat ISM to Power X-Ray and Molecular H2 Emission
Appleton, P. N.; Guillard, P.; Emonts, B. +3 more
We present a 70 ks Chandra observation of the radio galaxy 3C 293. This galaxy belongs to the class of molecular hydrogen emission galaxies (MOHEGs) that have very luminous emission from warm molecular hydrogen. In radio galaxies, the molecular gas appears to be heated by jet-driven shocks, but exactly how this mechanism works is still poorly unde…
Lepto-hadronic model for the broadband emission of Cygnus X-1
Romero, Gustavo E.; Pepe, Carolina; Vila, Gabriela S.
Context. Cygnus X-1 is a well-observed microquasar. Broadband observations at all wavelengths have been collected over the years. The origin of the MeV tail observed with COMPTEL and INTEGRAL is still under debate and it has mostly been attributed to the corona, although its high degree of polarization suggests that it is synchrotron radiation fro…
Whatever happened to the progenitors of supernovae 2008cn, 2009kr and 2009md?
Fraser, Morgan; Ergon, Mattias; Mattila, Seppo +2 more
We present new late-time, high-resolution observations of the sites of supernovae (SNe) 2008cn, 2009kr and 2009md, acquired with the Hubble Space Telescope. In all instances, significant flux from the SNe is still recovered at late times. We show that the previous identification of the progenitor of SN 2008cn was actually a blend of two sources, w…
Herschel spectroscopic observations of the compact obscured nucleus in Zw 049.057
Veilleux, S.; Farrah, D.; van der Werf, P. P. +6 more
Context. The luminous infrared galaxy
The flapping motion of the Venusian magnetotail: Venus Express observations
Barabash, S.; Futaana, Y.; Wei, Y. +7 more
With a newly developed technique and magnetic field measurements obtained by the magnetometer on Venus Express, we study the flapping motion of the Venusian magnetotail. We find that the flapping motion generally comprises contributions both from a nonpropagating steady flapping and a propagating kink-like flapping. The flapping motion tilts the c…
Light Echoes from Supernova 2014J in M82
Crotts, Arlin P. S.
Type Ia SN 2014J exploded in the nearby starburst galaxy M82 = NGC 3032 and was discovered at Earth about seven days later on 2014 January 21, reaching maximum light in V around 2014 February 5. SN 2014J is the closest SN Ia in at least four decades and probably many more. Recent Hubble Space Telescope/WFC3 imaging (2014 September 5 and 2015 Febru…
On the Fe K absorption - accretion state connection in the Galactic Centre neutron star X-ray binary AX J1745.6-2901
Nandra, K.; Degenaar, N.; Bianchi, S. +17 more
AX J1745.6-2901 is a high-inclination (eclipsing) neutron star low-mass X-ray binary (LMXB) located less than ∼1.5 arcmin from Sgr A⋆. Ongoing monitoring campaigns have targeted Sgr A⋆ frequently and these observations also cover AX J1745.6-2901. We present here an X-ray analysis of AX J1745.6-2901 using a large data set of 3…