Nondetection of the Neptune-Mass Planet Reported Around GJ 176

Details Nondetection of the Neptune-Mass Planet Reported Around GJ 176 Nondetection of the Neptune-Mass Planet Reported Around GJ 176

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...691.1738b&link_type=abstract

The Astrophysical Journal, Volume 691, Issue 2, pp. 1738-1743 (2009).

Astronomy and Astrophysics

Astronomy

3

Planetary Systems, Stars: Individual: Gj 176, Techniques: Radial Velocities

Scientific paper

Endl et al. reported a Neptune-mass planet in a 10.24 day orbit around GJ 176. This planet has raised interest because of its low mass (Msin i = 24 M Earth), correspondingly small velocity amplitude (K = 11.7 m s-1), and because GJ 176 is an M star. We report 41 precise Doppler measurements of GJ 176 obtained with the Keck-HIRES spectrometer over a 10 year time span. These measurements show no evidence of the 10.24 day companion, at a threshold of 4 m s-1, a factor of 3 less than the amplitude reported by Endl et al. The Keck velocities are consistent with instrumental noise and stellar jitter. The existence of the planet is thus called into question.
Based on observations obtained at the W. M. Keck Observatory, which is operated jointly by the University of California and the California Institute of Technology. Keck time has been granted by both NASA and the University of California.

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