Two new long-period giant planets from the McDonald Observatory planet search and two stars with long-period radial velocity signals related to stellar activity cycles
Article
Article Title | Two new long-period giant planets from the McDonald Observatory planet search and two stars with long-period radial velocity signals related to stellar activity cycles |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Endl, Michael (Author), Brugamyer, Erik J. (Author), Cochran, William D. (Author), MacQueen, Phillip J. (Author), Robertson, Paul (Author), Meschiari, Stefano (Author), Ramirez, Ivan (Author), Shetrone, Matthew (Author), Gullikson, Kevin (Author), Johnson, Marshall C. (Author), Wittenmyer, Robert (Author), Horner, Jonathan (Author), Ciardi, David R. (Author), Horch, Elliott (Author), Simon, Attila E. (Author), Howell, Steve B. (Author), Everett, Mark (Author), Caldwell, Caroline (Author) and Castanheira, Barbara G. (Author) |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 818 (1), pp. 1-20 |
Article Number | 34 |
Number of Pages | 20 |
Year | 2016 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/0004-637X/818/1/34 |
Web Address (URL) | http://iopscience.iop.org/article/10.3847/0004-637X/818/1/34 |
Abstract | We report the detection of two new long-period giant planets orbiting the stars HD 95872 and HD 162004 (φ1 Dra B) by the McDonald Observatory planet search. The planet HD 95872b has a minimum mass of 4.6 MJup and an orbital semimajor axis of 5.2 AU. The giant planet φ1 Dra Bb has a minimum mass of 1.5 MJup and an orbital semimajor axis of 4.4 AU. Both of these planets qualify as Jupiter analogs. These results are based on over one and a half decades of precise radial velocity (RV) measurements collected by our program using the McDonald Observatory Tull Coude spectrograph at the 2.7 m Harlan J. Smith Telescope. In the case of φ1 Dra B we also detect a long-term nonlinear trend in our data that indicates the presence of an additional giant planet, similar to the Jupiter-Saturn pair. The primary of the binary star system, φ1 Dra A, exhibits a very large amplitude RV variation due to another stellar companion. We detect this additional member using speckle imaging. We also report two cases - HD 10086 and HD 102870 (β Virginis) - of significant RV variation consistent with the presence of a planet, but that are probably caused by stellar activity, rather than reflexive Keplerian motion. These two cases stress the importance of monitoring the magnetic activity level of a target star, as long-term activity cycles can mimic the presence of a Jupiter-analog planet. |
Keywords | planetary systems – stars: activity – 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 | University of Texas at Austin, United States |
University of Texas, United States | |
University of New South Wales | |
Computational Engineering and Science Research Centre | |
National Aeronautics and Space Administration (NASA), United States | |
Southern Connecticut State University, United States | |
University of Bern, Switzerland | |
National Optical Astronomy Observatory, United States | |
Liverpool John Moores University, United Kingdom | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q3635/two-new-long-period-giant-planets-from-the-mcdonald-observatory-planet-search-and-two-stars-with-long-period-radial-velocity-signals-related-to-stellar-activity-cycles
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