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J/ApJ/720/872     A spectropolarimetric analysis of WASP-12     (Fossati+, 2010)

A detailed spectropolarimetric analysis of the planet-hosting star WASP-12. Fossati L., Bagnulo S., Elmasli A., Haswell C.A., Holmes S., Kochukhov O., Shkolnik E.L., Shulyak D.V., Bohlender D., Albayrak B., Froning C., Hebb L. <Astrophys. J., 720, 872-886 (2010)> =2010ApJ...720..872F
ADC_Keywords: Abundances ; Equivalent widths ; Stars, double and multiple ; Planets Keywords: stars: abundances - stars: fundamental parameters - stars: individual (WASP-12) - stars: magnetic field Abstract: The knowledge of accurate stellar parameters is paramount in several fields of stellar astrophysics, particularly in the study of extrasolar planets, where often the star is the only visible component and therefore used to infer the planet's fundamental parameters. Another important aspect of the analysis of planetary systems is the stellar activity and the possible star-planet interaction. Here, we present a self-consistent abundance analysis of the planet-hosting star WASP-12 and a high-precision search for a structured stellar magnetic field on the basis of spectropolarimetric observations obtained with the ESPaDOnS spectropolarimeter. Our results show that the star does not have a structured magnetic field, and that the obtained fundamental parameters are in good agreement with what was previously published. In addition, we derive improved constraints on the stellar age (1.0-2.65Gyr), mass (1.23-1.49M/M), and distance (295-465pc). WASP-12 is an ideal object in which to look for pollution signatures in the stellar atmosphere. We analyze the WASP-12 abundances as a function of the condensation temperature and compare them with those published by several other authors on planet-hosting and non-planet-hosting stars. Description: We observed WASP-12 using the Echelle SpectroPolarimetric Device for ObservatioNs of Stars (ESPaDOnS) spectropolarimeter at the Canada-France-Hawaii Telescope (CFHT) on 2010 January 3 and 5. Objects: ----------------------------------------------------- RA (2000) DE Designation(s) ----------------------------------------------------- 06 30 32.79 +29 40 20.3 WASP-12 = TYC 1891-1178-1 ----------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 56 854 Lines used for the abundance analysis refs.dat 189 44 References
See also: V/136 : Teff and metallicities for Tycho-2 stars (Ammons+, 2006) J/A+A/528/A65 : WASP-12b transits (Maciejewski+, 2011) J/MNRAS/411/L46 : Exoplanet magnetic fields (Vidotto+, 2011) J/MNRAS/414/108 : Calibrator of exoplanet-host stars (Beust+, 2011) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Ion Ion identification 7- 15 F9.4 0.1nm lambda Wavelength in Angstroms 16 A1 --- f_lambda [#*] multiplet or hyoerfine structure (1) 18- 23 F6.3 eV ExPot Excitation potential 25- 30 F6.3 [-] log(gf) Log of the oscillator strength 32- 37 F6.2 10-13m EW ? Equivalent width in milli-Angstroms 39 A1 --- f_EW [S] S: abundance was measured with synthetic spectra 41 A1 --- l_log(A) Limit flag on log(Abd) 43- 48 F6.2 [-] log(A) Log of the number abundance 50- 56 A7 --- r_log(gf) Reference code for log(gf) (see refs.dat file)
Note (1): Flag as follows: * = line subject to hyperfine structure, discussed in detail in the main text. # = multiplet (doublet or triplet) and only the strongest line is given.
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Ref Reference code 9- 27 A19 --- BibCode Bibcode 29- 72 A44 --- Aut Author's name(s) 74-189 A116 --- Comm Comment
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 27-Jun-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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