The Weihai Observatory search for close-in planets orbiting giant stars

Wittenmyer, Robert A. and Gao, Dongyang and Hu, Shao Ming and Villaver, Eva and Endl, Michael and Wright, Duncan (2015) The Weihai Observatory search for close-in planets orbiting giant stars. Publications of the Astronomical Society of the Pacific, 127 (956). pp. 1021-1026. ISSN 0004-6280

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version due to publisher copyright policy. However, the article can be gained for free from the publisher's website at: http://iopscience.iop.org/article/10.1086/683258
Faculty / Department / School: No Faculty
Date Deposited: 23 May 2017 02:59
Last Modified: 02 Nov 2017 04:35
Uncontrolled Keywords: planets; tidal forces; high-cadence obervational program; radial velocities;
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1086/683258
URI: http://eprints.usq.edu.au/id/eprint/31764

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