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Nondetection of the Neptune-Mass Planet Reported Around GJ 176

Butler, R. Paul and Howard, Andrew W. and Vogt, Steven S. and Wright, Jason T. (2009) Nondetection of the Neptune-Mass Planet Reported Around GJ 176. Astrophysical Journal, 691 (2). pp. 1738-1743. ISSN 0004-637X.

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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 (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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Howard, Andrew W.0000-0001-8638-0320
Wright, Jason T.0000-0001-6160-5888
Additional Information:© 2009 American Astronomical Society. Received 2008 May 26 Accepted 2008 October 15 Published 2009 February 9 The authors wish to extend special thanks to those of Hawaiian ancestry on whose sacred mountain of Mauna Kea we are privileged to be guests. Without their generous hospitality, the Keck observations presented herein would not have been possible. A.W.H. gratefully acknowledges support from a Townes Fellowship at the Space Sciences Laboratory at U. C. Berkeley. S.S.V. acknowledges NSF grant AST-0307493.
Funding AgencyGrant Number
Space Sciences Laboratory at UC Berkeley, Townes FellowshipUNSPECIFIED
Subject Keywords:planetary systems; stars: individual (GJ 176) ; techniques: radial velocities
Issue or Number:2
Record Number:CaltechAUTHORS:20170705-072134923
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Official Citation:R. Paul Butler et al 2009 ApJ 691 1738
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78742
Deposited By: Ruth Sustaita
Deposited On:05 Jul 2017 22:14
Last Modified:03 Oct 2019 18:11

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