A Caltech Library Service

Limits on Stellar Companions to Exoplanet Host Stars with Eccentric Planets

Kane, Stephen R. and Howell, Steve B. and Horch, Elliott P. and Feng, Ying and Hinkel, Natalie R. and Ciardi, David R. and Everett, Mark E. and Howard, Andrew W. and Wright, Jason T. (2014) Limits on Stellar Companions to Exoplanet Host Stars with Eccentric Planets. Astrophysical Journal, 785 (2). Art. No. 93. ISSN 0004-637X.

PDF - Published Version
See Usage Policy.

PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


Though there are now many hundreds of confirmed exoplanets known, the binarity of exoplanet host stars is not well understood. This is particularly true of host stars that harbor a giant planet in a highly eccentric orbit since these are more likely to have had a dramatic dynamical history that transferred angular momentum to the planet. Here we present observations of four exoplanet host stars that utilize the excellent resolving power of the Differential Speckle Survey Instrument on the Gemini North telescope. Two of the stars are giants and two are dwarfs. Each star is host to a giant planet with an orbital eccentricity >0.5 and whose radial velocity (RV) data contain a trend in the residuals to the Keplerian orbit fit. These observations rule out stellar companions 4-8 mag fainter than the host star at passbands of 692 nm and 880 nm. The resolution and field of view of the instrument result in exclusion radii of 0.''05-1.''4, which excludes stellar companions within several AU of the host star in most cases. We further provide new RVs for the HD 4203 system that confirm that the linear trend previously observed in the residuals is due to an additional planet. These results place dynamical constraints on the source of the planet's eccentricities, place constraints on additional planetary companions, and inform the known distribution of multiplicity amongst exoplanet host stars.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Kane, Stephen R.0000-0002-7084-0529
Howell, Steve B.0000-0002-2532-2853
Horch, Elliott P.0000-0003-2159-1463
Hinkel, Natalie R.0000-0003-0595-5132
Ciardi, David R.0000-0002-5741-3047
Everett, Mark E.0000-0002-0885-7215
Howard, Andrew W.0000-0001-8638-0320
Wright, Jason T.0000-0001-6160-5888
Additional Information:© 2014 American Astronomical Society. Received 2014 January 2; accepted 2014 February 25; published 2014 March 31. This work is based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovaciόn Productiva (Argentina). This research has made use of the Exoplanet Orbit Database and the Exoplanet Data Explorer at This research has also made use of the NASA/IPAC Infrared Science Archive,which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. The authors acknowledge financial support from the National Science Foundation through grant AST-1109662.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords: planetary systems; stars: individual (HD 4203, HD 168443, HD 1690, HD 137759); techniques: high angular resolution; techniques: radial velocities
Issue or Number:2
Record Number:CaltechAUTHORS:20140618-103636659
Persistent URL:
Official Citation:Limits on Stellar Companions to Exoplanet Host Stars with Eccentric Planets Stephen R. Kane et al. 2014 ApJ 785 93
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46329
Deposited By: Ruth Sustaita
Deposited On:18 Jun 2014 17:51
Last Modified:09 Mar 2020 13:18

Repository Staff Only: item control page