Limits on stellar companions to exoplanet host stars with eccentric planets
Article
Article Title | Limits on stellar companions to exoplanet host stars with eccentric planets |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Kane, Stephen R. (Author), Howell, Steve B. (Author), Horch, Elliott P. (Author), Feng, Ying (Author), Hinkel, Natalie R. (Author), Ciardi, David R. (Author), Everett, Mark E. (Author), Howard, Andrew W. (Author) and Wright, Jason T. (Author) |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 785 (2), pp. 93-102 |
Article Number | 93 |
Number of Pages | 10 |
Year | 2014 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.1088/0004-637X/785/2/93 |
Web Address (URL) | http://iopscience.iop.org/article/10.1088/0004-637X/785/2/93 |
Abstract | 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. |
Keywords | planetary systems; stars: individual (HD 4203, HD 168443, HD 1690, HD 137759); techniques: high angular resolution; techniques: Radial velocities; |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Byline Affiliations | San Francisco State University, United States |
National Aeronautics and Space Administration (NASA), United States | |
Southern Connecticut State University, United States | |
Pennsylvania State University, United States | |
National Optical Astronomy Observatory, United States | |
University of Hawaii, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q430v/limits-on-stellar-companions-to-exoplanet-host-stars-with-eccentric-planets
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