54 citations · 255 across the 15 of their papers we have counts for
6 papers · 1 filter
Insight into atmospheres of extrasolar planets through plasma processes
Ch. Helling, I. Vorgul
Extrasolar planets appear in a chemical diversity unseen in our own solar system. Despite their atmospheres being cold, continuous and transient plasma processes do affect these at…
Robust detection of quasi-periodic variability: A HAWKI mini survey of late T dwarfs
S. P. Littlefair, B. Burningham, Ch. Helling
We present HAWK-I J-band light curves of five late-type T dwarfs (T6.5-T7.5) with a typical duration of four hours, and investigate the evidence for quasi-periodic photometric vari…
Dust in brown dwarfs and extra-solar planets V. Cloud formation in carbon- and oxygen-rich environment
Ch. Helling, D. Tootill, P. Woitke +1
Recent observations indicate potentially carbon-rich exoplanet atmospheres. Spectral fitting methods for brown dwarfs and exoplanets have invoked the C/O ratio as additional parame…
Flash ionisation signature in coherent cyclotron emission from Brown Dwarfs
Irena Vorgul, Christiane Helling
Brown dwarfs form mineral clouds in their atmospheres, where charged particles can produce large-scale discharges in form of lightning resulting in a substantial sudden increase of…
Multiwaveband photometry of the irradiated brown dwarf WD0137-349B
S. L. Casewell, K. A. Lawrie, P. F. L. Maxted +7
WD0137-349 is a white dwarf-brown dwarf binary system in a 116 minute orbit. We present radial velocity observations and multiwaveband photometry from V, R and I in the optical, to…
M dwarf stars in the light of (future) exoplanet searches
B. Rojas-Ayala, E. J. Hilton, A. W. Mann +8
We present a brief overview of a splinter session on M dwarf stars as planet hosts that was organized as part of the Cool Stars 17 conference. The session was devoted to reviewing…