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Stellar Companions to the Exoplanet Host Stars HD 2638 and HD 164509

Wittrock, Justin M. and Kane, Stephen R. and Horch, Elliott P. and Hirsch, Lea and Howell, Steve B. and Ciardi, David R. and Everett, Mark E. and Teske, Johanna K. (2016) Stellar Companions to the Exoplanet Host Stars HD 2638 and HD 164509. Astronomical Journal, 152 (5). Art. No. 149. ISSN 0004-6256.

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An important aspect of searching for exoplanets is understanding the binarity of the host stars. It is particularly important, because nearly half of the solar-like stars within our own Milky Way are part of binary or multiple systems. Moreover, the presence of two or more stars within a system can place further constraints on planetary formation, evolution, and orbital dynamics. As part of our survey of almost a hundred host stars, we obtained images at 692 and 880 nm bands using the Differential Speckle Survey Instrument (DSSI) at the Gemini-North Observatory. From our survey, we detect stellar companions to HD 2638 and HD 164509. The stellar companion to HD 2638 has been previously detected, but the companion to HD 164509 is a newly discovered companion. The angular separation for HD 2638 is 0.512 ± 0farcs002 and for HD 164509 is 0.697 ± 0farcs002. This corresponds to a projected separation of 25.6 ± 1.9 au and 36.5 ± 1.9 au, respectively. By employing stellar isochrone models, we estimate the mass of the stellar companions of HD 2638 and HD 164509 to be 0.483 ± 0.007 M_⊙ and $0.416 ± 0.007, M_⊙, respectively, and their effective temperatures to be 3570 ± 8 K and 3450 ± 7 K, respectively. These results are consistent with the detected companions being late-type M dwarfs.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Kane, Stephen R.0000-0002-7084-0529
Horch, Elliott P.0000-0003-2159-1463
Hirsch, Lea0000-0001-8058-7443
Howell, Steve B.0000-0002-2532-2853
Ciardi, David R.0000-0002-5741-3047
Everett, Mark E.0000-0002-0885-7215
Additional Information:© 2016. The American Astronomical Society. Received 2016 June 23; revised 2016 August 29; accepted 2016 August 30; published 2016 October 31. 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 Innovación Productiva (Argentina). This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. The results reported herein benefited from collaborations and/or information exchange within NASA's Nexus for Exoplanet System Science (NExSS) research coordination network sponsored by NASA's Science Mission Directorate.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:planetary systems – stars: individual (HD 2638, HD 164509) – techniques: high angular resolution
Issue or Number:5
Record Number:CaltechAUTHORS:20161031-130907257
Persistent URL:
Official Citation:Justin M. Wittrock et al 2016 AJ 152 149
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71628
Deposited By: George Porter
Deposited On:31 Oct 2016 22:14
Last Modified:03 Oct 2019 16:09

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