51 Peg: a star with a second planet or a pulsating star?

Details 51 Peg: a star with a second planet or a pulsating star? 51 Peg: a star with a second planet or a pulsating star?

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006tafp.conf..141h&link_type=abstract

"Tenth Anniversary of 51 Peg-b: Status of and prospects for hot Jupiter studies. Colloquium held at Observatoire de Haute Proven

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Scientific paper

The first determination of improved orbital elements of this star--planet system based on a combination of all available radial velocities of 51 Peg is derived. A period analysis of the O--C deviations of the times of RV maxima from the new linear ephemeris shows a periodicity of 250-d with a large amplitude of 0063° ± 0.005°. If interpreted as a light--time effect due to a third body in the system, this would imply an unrealistically large mass. Hence, one should seek other explanations like forced non--radial pulsations. However, it would be necessary to confirm or disprove the reality of the 250-d period via new dedicated observations.

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