Browsing by Author "Jeffers, S.V."

Now showing items 1-8 of 8

    • Direct Evidence for a Polar Spot on SV Camelopardalis 

      Jeffers, S.V.; Collier Cameron, A.; Barnes, J.R.; Aufdenberg, J.P.; Hussain, G.A.J. (2005)

    • Hubble Space Telescope observations of SV Cam - I. The importance of unresolved star-spot distributions in light-curve fitting 

      Jeffers, S.V.; Barnes, J.R.; Collier Cameron, A.; Donati, J-F. (2006)

    • Is it possible to detect planets around young active G and K dwarfs? 

      Jeffers, S.V.; Barnes, J.R.; Jones, H.R.A.; Reiners, A.; Pinfield, D.J.; Marsden, S.C. (2014-03)
      Theoretical predictions suggest that the distribution of planets in very young stars could be very different to that typically observed in Gyr old systems that are the current focus of radial velocity surveys. However, the ...

    • J-band variability of M dwarfs in the WFCAM Transit Survey 

      Goulding, N. T.; Barnes, J. R.; Pinfield, D.J.; Kovacs, G.; Birkby, J.; Hodgkin, S.; Catalan, S.; Sipocz, B.; Jones, H.R.A.; del Burgo, C.; Jeffers, S.V.; Nefs, S.; Galvez-Ortiz, M. -C.; Martin, E. L. (2012-12)
      We present an analysis of the photometric variability of M dwarfs in the Wide Field Camera (WFCAM) Transit Survey. Although periodic light-curve variability in low mass stars is generally dominated by photospheric star ...

    • Periodic variability of spotted M dwarfs in WTS 

      Goulding, N. T.; Barnes, J.R.; Pinfield, D.J.; del Burgo, C.; Kovacs, G.; Birkby, J.; Hodgkin, S.; Catalan, S.; Sipocz, B.; Jones, H.R.A.; Jeffers, S.V.; Nefs, S. (EDP Sciences, 2013)
      We present an analysis of the photometric variability of M dwarfs in the WFCAM Transit Survey, selected from spectral types inferred by their WTS and SDSS colours, with periods detected using a Lomb-Scargle Periodogram ...

    • Red Optical Planet Survey : A radial velocity search for low mass M dwarf planets 

      Barnes, J.R.; Jenkins, J. S.; Jones, H.R.A.; Rojo, P.; Arriagada, P.; Jordan, A.; Minniti, D.; Tuomi, M.; Jeffers, S.V.; Pinfield, D.J. (EDP Sciences, 2013)
      We present radial velocity results from our Red Optical Planet Survey (ROPS), aimed at detecting low-mass planets orbiting mid-late M dwarfs. The similar to 10 ms(-1) precision achieved over 2 consecutive nights with the ...

    • Red Optical Planet Survey: : a new search for habitable earths in the southern sky 

      Barnes, John; Jenkins, J.S.; Jones, H.R.A.; Rojo, P.; Arriagada, Pamela; Jordan, Andres; Minniti, Dante; Tuomi, Mikko; Jeffers, S.V.; Pinfield, D.J. (2012-07-01)
      We present the first results from our Red Optical Planet Survey (ROPS) to search for low mass planets orbiting late type dwarfs (M5.5V - M9V) in their habitable zones (HZ). Our observations, with the red arm MIKE spectrograph ...

    • Starspot distributions on fully convective M dwarfs : implications for radial velocity planet searches 

      Barnes, J.R.; Jeffers, S.V.; Jones, H.R.A.; Pavlenko, Ya. V.; Jenkins, J. S.; Haswell, C.A.; Lohr, M. E. (2015-10-07)
      Since M4.5 - M9 dwarfs exhibit equatorial rotation velocities of order 10 km/s on average, radial velocity surveys targeting this stellar population will likely need to find methods to effectively remove starspot jitter. ...