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HD 148628


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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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Osservazione e dati astrometrici

Costellazione:Triangolo Australe
Ascensione retta:16h33m02.14s
Declinazione:-60°54'10.1"
Magnitudine apparente:8.162
Distanza:76.805 parsec
Moto proprio RA:57.5
Moto proprio Dec:83
B-T magnitude:8.755
V-T magnitude:8.211

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 148628
TYCHO-2 2000TYC 9037-1656-1
USNO-A2.0USNO-A2 0225-25638540
HIPHIP 81037

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