Journal
ASTROPHYSICAL JOURNAL
Volume 691, Issue 2, Pages 1738-1743Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/691/2/1738
Keywords
planetary systems; stars: individual (GJ 176); techniques: radial velocities
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Funding
- Townes Fellowship at the Space Sciences Laboratory at U. C. Berkeley
- NSF [AST-0307493]
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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 (M sin 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.
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