Two Jovian-Mass Planets in Earthlike Orbits

Details Two Jovian-Mass Planets in Earthlike Orbits Two Jovian-Mass Planets in Earthlike Orbits

2007-08-06

arxiv.org/abs/0708.0832v1

Astronomy and Astrophysics

Astrophysics

32 pages, including 11 figures and 5 tables. Accepted by ApJ

Scientific paper

10.1086/522106

We report the discovery of two new planets: a 1.94 M_Jup planet in a 1.8-year orbit of HD 5319, and a 2.51 M_Jup planet in a 1.1-year orbit of HD 75898. The measured eccentricities are 0.12 for HD 5319 b and 0.10 for HD 75898 b, and Markov Chain Monte Carlo simulations based on derived orbital parameters indicate that the radial velocities of both stars are consistent with circular planet orbits. With low eccentricity and 1 < a < 2 AU, our new planets have orbits similar to terrestrial planets in the solar system. The radial velocity residuals of both stars have significant trends, likely arising from substellar or low-mass stellar companions.

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