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HD 215460


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Mining the Metal-rich Stars for Planets
We examine the correlation between stellar metallicity and the presenceof short-period planets. It appears that approximately 1% of dwarf starsin the solar neighborhood harbor short-period planets characterized bynear-circular orbits and orbital periods P<20 days. However, amongthe most metal-rich stars (defined as having [Fe/H]>0.2 dex), itappears that the fraction increases to 10%. Using the Hipparcos databaseand the Hauck & Mermilliod compilation of Strömgren uvbyphotometry, we identify a sample of 206 metal-rich stars of spectraltype K, G and F which have an enhanced probability of harboringshort-period planets. Many of these stars would be excellent candidatesfor addition to radial velocity surveys. We have searched the Hipparcosepoch photometry for transiting planets within our 206 star catalog. Wefind that the quality of the Hipparcos data is not high enough to permitunambiguous transit detections. It is, however, possible to identifycandidate transit periods. We then discuss various ramifications of thestellar metallicity-planet connection. First, we show that there ispreliminary evidence for increasing metallicity with increasing stellarmass among known planet-bearing stars. This trend can be explained by ascenario in which planet-bearing stars accrete an average of 30M⊕ of rocky material after the gaseous protoplanetarydisk phase has ended. We present dynamical calculations which suggestthat a survey of metallicities of spectroscopic binary stars can be usedto understand the root cause of the stellar metallicity-planetconnection.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Kanatli At
Sað Açýklýk:22h45m13.50s
Yükselim:+06°24'09.4"
Görünürdeki Parlaklýk:8.357
Uzaklýk:92.507 parsek
özdevim Sað Açýklýk:34.3
özdevim Yükselim:-17.8
B-T magnitude:8.872
V-T magnitude:8.4

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 215460
TYCHO-2 2000TYC 574-363-1
USNO-A2.0USNO-A2 0900-20223184
HIPHIP 112336

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