Radial Velocity Discovery of an Eccentric Jovian World Orbiting at 18 au
Article
Article Title | Radial Velocity Discovery of an Eccentric Jovian World Orbiting at 18 au |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Blunt, Blunt, Endl, Michael, Weiss, Lauren M., Cochran, William D, Howard, Andrew W., MacQueen, Phillip J., Fulton, Benjamin J., Henry, Gregory W., Johnson, Marshall C., Kosiarek, Molly R., Lawson, Kellen D., Macintosh, Macintosh, Mills, Sean M., Nielsen, Eric L., Petigura, Erik A., Schneider, Glenn, Vanderburg, Andrew, Wisniewski, Wisniewski, Wittenmyer, Rob, Brugamyer, Erik, Caldwell, Caroline, Cochran,, Hatzes, Artie P., Hirsch, Lea A., Isaacson, Howard, Robertson, Paul, Roy, Arpita and Shen, Zili |
Journal Title | The Astronomical Journal |
Journal Citation | 158 (5), pp. 1-15 |
Article Number | 181 |
Number of Pages | 15 |
Year | Nov 2019 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ab3e63 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ab3e63 |
Abstract | Based on two decades of radial velocity (RV) observations using Keck/High Resolution Echelle Spectrometer (HIRES) and McDonald/Tull, and more recent observations using the Automated Planet Finder, we found that the nearby star HR 5183 (HD 120066) hosts a 3 MJ minimum mass planet with an orbital period of 74(-22)(+43) yr. The orbit is highly eccentric (e similar or equal to 0.84), shuttling the planet from within the orbit of Jupiter to beyond the orbit of Neptune. Our careful survey design enabled high cadence observations before, during, and after the planet's periastron passage, yielding precise orbital parameter constraints. We searched for stellar or planetary companions that could have excited the planet's eccentricity, but found no candidates, potentially implying that the perturber was ejected from the system. We did identify a bound stellar companion more than 15,000 au from the primary, but reasoned that it is currently too widely separated to have an appreciable effect on HR 5183 b. Because HR 5183 b's wide orbit takes it more than 30 au (1 '') from its star, we also explored the potential of complimentary studies with direct imaging or stellar astrometry. We found that a Gaia detection is very likely, and that imaging at 10 mu m is a promising avenue. This discovery highlights the value of long-baseline RV surveys for discovering and characterizing long-period, eccentric Jovian planets. This population may offer important insights into the dynamical evolution of planetary systems containing multiple massive planets. |
Keywords | planets and satellites: detection; planets and satellites: fundamental parameters; stars: individual (HR 5183) |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | California Institute of Technology (Caltech), United States |
Center for Astrophysics Harvard and Smithsonian, United States | |
University of Texas at Austin, United States | |
University of Hawaii, United States | |
NASA Exoplanet Science Institute, United States | |
Tennessee State University, United States | |
Ohio State University, United States | |
University of California, United States | |
University of Oklahoma, United States | |
Stanford University, United States | |
University of Arizona, United States | |
Centre for Astrophysics | |
Karl Schwarzschild Observatory, Germany | |
Academic Registrar's Office | |
University of California Berkeley, United States |
https://research.usq.edu.au/item/y3wq5/radial-velocity-discovery-of-an-eccentric-jovian-world-orbiting-at-18-au
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