New constraints from the H alpha line for the temperature of the transiting planet host star OGLE-TR-10

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Eiff, MAV (Author) Other; N.C. Santos (Author) Other

Journal

Title: Astronomische Nachrichten

Vol. 329

Pages: 573-578

ISSN: 0004-6337

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 4 Citations

Other information

Authenticus ID: P-003-YN7

DOI: 10.1002/asna.200710969

Abstract (EN): 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 Ha 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 alpha profiles to the observed spectrum. With a result of T-eff = 6020 +/- 140 K, the Ha profile clearly favours one of the previous measurements. The H alpha line is further consistent with dwarf-like surface gravities as well as solar and super-solar metallicities previously derived for OGLE-TR-10. The Ha line could not be used to its full potential, partly because of the varying shape of the UVES echelle orders after flat field correction. We suggest to improve this feature when constructing future spectrographs. (c) 2008 WILEY-VCH Verlag GmbH&Co. KGaA. Weinheim.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6