The Weihai Observatory search for close-in planets orbiting giant stars
Article
Article Title | The Weihai Observatory search for close-in planets orbiting giant stars |
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ERA Journal ID | 1082 |
Article Category | Article |
Authors | Wittenmyer, Robert A. (Author), Gao, Dongyang (Author), Hu, Shao Ming (Author), Villaver, Eva (Author), Endl, Michael (Author) and Wright, Duncan (Author) |
Journal Title | Publications of the Astronomical Society of the Pacific |
Journal Citation | 127 (956), pp. 1021-1026 |
Number of Pages | 6 |
Year | 2015 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6280 |
1538-3873 | |
Digital Object Identifier (DOI) | https://doi.org/10.1086/683258 |
Web Address (URL) | http://iopscience.iop.org/article/10.1086/683258/pdf |
Abstract | Planets are known to orbit giant stars, yet there is a shortage of planets orbiting within ∼0.5 AU (P ≲ 100 days). First-ascent giants have not expanded enough to engulf such planets, but tidal forces can bring planets to the surface of the star far beyond the stellar radius. So the question remains: Are tidal forces strong enough in these stars to engulf all the missing planets? We describe a high-cadence observational program to obtain precise radial velocities of bright giants from Weihai Observatory of Shandong University. We present data on the planet host Beta Gem (HD 62509), confirming our ability to derive accurate and precise velocities; our data achieve an rms of 7:3 ms-1 about the Keplerian orbit fit. This planet-search program currently receives ∼100 nights per year, allowing us to aggressively pursue short-period planets to determine whether they are truly absent. |
Keywords | planets; tidal forces; high-cadence obervational program; radial velocities; |
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 | University of New South Wales |
Shandong University, China | |
Autonomous University of Madrid, Spain | |
University of Texas at Austin, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q41qx/the-weihai-observatory-search-for-close-in-planets-orbiting-giant-stars
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