Kepler-432: a red giant interacting with one of its two long-period giant planets
Article
Article Title | Kepler-432: a red giant interacting with one of its two long-period giant planets |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Quinn, Samuel N. (Author), White, Timothy R. (Author), Latham, David W. (Author), Chaplin, William J. (Author), Handberg, Rasmus (Author), Huber, Daniel (Author), Kipping, David M. (Author), Payne, Matthew J. (Author), Jiang, Chen (Author), Aguirre, Victor Silva (Author), Stello, Dennis (Author), Sliski, David H. (Author), Ciardi, David R. (Author), Buchhave, Lars A. (Author), Bedding, Timothy R. (Author), Davies, Guy R. (Author), Hekker, Saskia (Author), Kjeldsen, Hans (Author), Kuszlewicz, James S. (Author), Everett, Mark E. (Author), Howell, Steve B. (Author), Basu, Sarbani (Author), Campante, Tiago L. (Author), Christensen-Dalsgaard, Jorgen (Author), Elsworth, Yvonne P. (Author), Karoff, Christoffer (Author), Kawaler, Steven D. (Author), Lund, Mikkel N. (Author), Lundkvist, Mia (Author), Esquerdo, Gilbert A. (Author), Calkins, Michael L. (Author) and Berlind, Perry (Author) |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 803 (2), pp. 49-69 |
Article Number | 49 |
Number of Pages | 21 |
Year | 2015 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.1088/0004-637X/803/2/49 |
Web Address (URL) | http://iopscience.iop.org/article/10.1088/0004-637X/803/2/49 |
Abstract | We report the discovery of Kepler-432b, a giant planet (Mb=5.41+0.036-0.039MJup,Rb=1.145+0.039-0.039RJup) transiting an evolved star (M∗=1.320.10-0.07M⊙, R∗=4.060.12-0.08R⊙,) with an orbital period of Pb=52.501129+0.000067-0.000053 days. Radial velocities (RVs) reveal that Kepler-432b orbits its parent star with an eccentricity of e=0.51340.0098-0.0089, which we also measure independently with asterodensity profiling (AP; e=0.5070.039-0.114), thereby confirming the validity of AP on this particular evolved star. The well-determined planetary properties and unusually large mass also make this planet an important benchmark for theoretical models of super-Jupiter formation. Long-term RV monitoring detected the presence of a non-transiting outer planet (Kepler-432c; Mcsin ic=2.43+0.22-0.24, days), and adaptive optics imaging revealed a nearby (), faint companion (Kepler-432B) that is a physically bound M dwarf. The host star exhibits high signal-to-noise ratio asteroseismic oscillations, which enable precise measurements of the stellar mass, radius, and age. Analysis of the rotational splitting of the oscillation modes additionally reveals the stellar spin axis to be nearly edge-on, which suggests that the stellar spin is likely well aligned with the orbit of the transiting planet. Despite its long period, the obliquity of the 52.5 day orbit may have been shaped by star-planet interaction in a manner similar to hot Jupiter systems, and we present observational and theoretical evidence to support this scenario. Finally, as a short-period outlier among giant planets orbiting giant stars, study of Kepler-432b may help explain the distribution of massive planets orbiting giant stars interior to 1 AU. |
Keywords | asteroseismology; planet; planets and satellites: dynamical evolution and stability; planets and satellites: Formation; planets and satellites: gaseous planets; star interactions; stars: individual (Kepler-432); |
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. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Georgia State University, United States |
Georg August University of Gottingen, Germany | |
Center for Astrophysics Harvard and Smithsonian, United States | |
University of Birmingham, United Kingdom | |
Aarhus University, Denmark | |
University of Sydney | |
University of Pennsylvania, United States | |
National Aeronautics and Space Administration (NASA), United States | |
Max Planck Society, Germany | |
National Optical Astronomy Observatory, United States | |
Yale University, United States | |
Iowa State University, United States |
https://research.usq.edu.au/item/q4305/kepler-432-a-red-giant-interacting-with-one-of-its-two-long-period-giant-planets
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