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Title: The X-ray Evidence that the 51 Peg Companion is a Planet
Authors: Pravdo, Steve
Issue Date: 1996
Abstract: 51 Pegasi is a nearby G2-3 V star, which is similar to the Sun. Observers have recently detected and confirmed that 51 Pegasi has sinusoidal radial velocity variations with a period of 4.2 days and amplitude of 59 m/s. The radial velocity, if due to orbital motion around the system center-of-mass, implies a minimum companion mass of 0.47 Jupiter masses, which results from the assumption that the inclination angle of ths system is 90<sup>0</sup> from the line of sight. We argue that the X-ray luminosity on the 51 Peg system implies that the unseen companion is a planet, independent of any assumption about the inclination angle.
Appears in Collections:JPL TRS 1992+

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