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A giant planet orbiting the ‘extreme horizontal branch’ star V391 Pegasi

A giant planet orbiting the ‘extreme horizontal branch’ star V391 Pegasi. Silvotti, R. et al., Nature 449, 13 September 2007. The pulsational spectrum of V391 Pegasi exhibits 4 or 5 pulsation periods between 342s and 354s. The largest two amplitudes of pulsations are 1% and 0.4%.

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A giant planet orbiting the ‘extreme horizontal branch’ star V391 Pegasi

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  1. A giant planet orbiting the ‘extreme horizontal branch’ star V391 Pegasi Silvotti, R. et al., Nature 449, 13 September 2007.

  2. The pulsational spectrum of V391 Pegasi exhibits 4 or 5 pulsation periods between 342s and 354s. • The largest two amplitudes of pulsations are 1% and 0.4%.

  3. The observed-calculated diagram P2 P1 x x x x x t

  4. P+dP/dt P x x x x x t

  5. Summary • They reported the discovery of a planetary-mass body (Msini=3.2MJ) orbiting the V391 Pegasi at a distance of about 1.7 AU with period of 3.2 years. Thank you~~~~~~ XD

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