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Browsing University of Hertfordshire by Author "Petit, P."
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Analysis of combined radial velocities and activity of BD+20 1790: : evidence supporting the existence of a planetary companion
Hernán-Obispo, M.; Tuomi, Mikko; Gálvez-Ortiz, M. C.; Golovin, A.; Barnes, J. R.; Jones, Hugh; Kane, S. R.; Pinfield, D.; Jenkins, J. S.; Petit, P.; Anglada-Escudé, G.; Marsden, S. C.; Catalán, S.; Jeffers, S. V.; Castro, E. de; Cornide, M.; Garcés, A.; Jones, M. I.; Gorlova, N.; Andreev, M. (2015-04-01)This paper presents the simultaneous Bayesian analysis of the radial velocity and activity indices for the K5Ve active star BD+20 1790, that was proposed to host a close-in massive planet by Hern\'an-Obispo et al. (2010). ... -
The dependence of differential rotation on temperature and rotation
Barnes, J.R.; Collier Cameron, A.; Donati, J-F.; James, D.J.; Marsden, S.C.; Petit, P. (2005)We use Doppler imaging techniques to determine the dependence of starspot rotation rates on latitude in an homogeneous sample of young, rapidly-rotating solar analogues. A solar-like differential rotation law is used, where ... -
Recovering planet radial velocity signals in the presence of starspot activity in fully convective stars
Barnes, John; Anglada Escude, Guillem; Tuomi, Mikko; Jones, Hugh; Feng, F.; Jeffers, S. V.; Haswell, C. A.; Jenkins, J. S.; Petit, P. (2017-04-01)Accounting for stellar activity is a crucial component of the search for ever-smaller planets orbiting stars of all spectral types. We use Doppler imaging methods to demonstrate that starspot-induced radial velocity ... -
The surprising magnetic topology of t Sco: fossil remnant or dynamo output
Donati, J-F.; Howarth, I.D.; Jardine, M.; Petit, P.; Catala, C.; Landstreet, J.D.; Bouret, J-C.; Alecian, E.; Barnes, J.R.; Forveille, T.; Paletou, F.; Manset, N. (2006)