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New constraints from the H α line for the temperature of the transiting planet host star OGLE‐TR‐10
Author(s) -
Ammlervon Eiff M.,
Santos N.C.
Publication year - 2008
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.200710969
Subject(s) - physics , planet , spectrograph , astrophysics , effective temperature , line (geometry) , planetary system , normalization (sociology) , data reduction , astronomy , spectral line , stars , geometry , mathematics , sociology , anthropology , computer science , data mining
The spectroscopic analysis of systems with transiting planets gives strong constraints on planetary masses and radii as well as the chemical composition of the systems. The properties of the system OGLE‐TR‐10 are not well‐constrained, partly due to the discrepancy of previous measurements of the effective temperature of the host star. This work, which is fully independent from previous works in terms of data reduction and analysis, uses the H α profile in order to get an additional constraint on the effective temperature. We take previously published UVES observations which have the highest available signal‐to‐noise ratio for OGLE‐TR‐10. A proper normalization to the relative continuum is done using intermediate data products of the reduction pipeline of the UVES spectrograph. The effective temperature then is determined by fitting synthetic H α profiles to the observed spectrum. With a result of T eff = 6020 ± 140 K, the H α profile clearly favours one of the previous measurements. The H α line is further consistent with dwarf‐like surface gravities as well as solar and super‐solar metallicities previously derived for OGLE‐TR‐10.The H α line could not be used to its full potential, partly because of the varying shape of the UVES échelle orders after flat field correction. We suggest to improve this feature when constructing future spectrographs. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)