Two Jovian-Mass Planets in Earthlike Orbits

Creators: Robinson, Sarah E.; Laughlin, Gregory; Vogt, Steven S.; Fischer, Debra A.; Butler, R. Paul; Marcy, Geoffrey W.; Henry, Gregory W.; Driscoll, Peter; Takeda, Genya; Johnson, John A.

Style

An error occurred while generating the citation.

Abstract

We report the discovery of two new planets: a 1.94 M_(Jup) planet in a 1.8 yr orbit of HD 5319, and a 2.51 M_(Jup) planet in a 1.1 yr orbit of HD 75898. The measured eccentricities are 0.12 for HD 5319b and 0.10 for HD 75898b, and Markov chain Monte Carlo simulations based on the derived orbital parameters indicate that the radial velocities of both stars are consistent with circular planet orbits. With low eccentricity and 1 AU < α < 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.

Additional Information

© 2007 American Astronomical Society. Received 2007 April 3; accepted 2007 July 29. Based on observations obtained at the W. M. Keck Observatory, which is operated by the University of California and the California Institute of Technology. Keck time has been granted by NOAO and NASA. S. E. R. thanks Eugenio Rivera and Peter Bodenheimer for helpful input on this work. We gratefully acknowledge the dedication and support of the Keck Observatory staff, in particular Grant Hill for support with HIRES.We thank the NASA and UC Telescope assignment committees for generous allocations of telescope time. The authors extend thanks to those of Hawaiian ancestry on whose sacred mountain of Mauna Keawe are privileged to be guests. Without their kind hospitality, the Keck observations presented here would not have been possible. The authors have made use of the SIMBAD database, the Vienna Atomic Line Database, and NASA's Astrophysics Data System. This research is made possible by the generous support of Sun Microsystems, NASA, and the NSF. S. E. R. was supported by the National Science Foundation Graduate Research Fellowship. G. L. received support from the NSF Career grant (0449986). S. S.V.'s work was supported by the NSF grant AST 03-07493. D. A. F. was supported by Research Corporation's Cottrell Science Scholar program and by NASA grant NNG 05-G164G. We thank the Michelson Science Center for travel support through the KDPA program. Facilities: Keck:I (HIRES)

Attached Files

Published - 0004-637X_670_2_1391.pdf

Files

0004-637X_670_2_1391.pdf

Files (651.3 kB)

Name	Size	Download all
0004-637X_670_2_1391.pdf md5:821be117cbc294774ff23cd6836c9419	651.3 kB	Preview Download

Additional details

	All versions	This version
Views	0	0
Downloads	0	0
Data volume	0 Bytes	0 Bytes