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 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:
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RA (2000) DE Designation(s)
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06 30 32.79 +29 40 20.3 WASP-12 = TYC 1891-1178-1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 56 854 Lines used for the abundance analysis
refs.dat 189 44 References
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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
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Bytes Format Units Label Explanations
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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)
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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.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Ref Reference code
9- 27 A19 --- BibCode Bibcode
29- 72 A44 --- Aut Author's name(s)
74-189 A116 --- Comm Comment
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 27-Jun-2012