A detailed spectropolarimetric analysis of the planet-hosting star WASP-12

L. Fossati, S. Bagnulo, A. Elmasli, C. A. Haswell, S. Holmes, O. Kochukhov, Evgenya Shkolnik, D. V. Shulyak, D. Bohlender, B. Albayrak, C. Froning, L. Hebb

Research output: Contribution to journalArticle

40 Citations (Scopus)

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 (1.0-2.65 Gyr), mass (1.23-1.49 M/M ), and distance (295-465 pc). 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. We find hints of atmospheric pollution in WASP-12's photosphere but are unable to reach firm conclusions with our present data. We conclude that a differential analysis based on WASP-12 twins will probably clarify whether an atmospheric pollution is present as well as the nature of this pollution and its implications in planet formation and evolution. We also attempt the direct detection of the circumstellar disk through infrared excess, but without success.

Original languageEnglish (US)
Pages (from-to)872-886
Number of pages15
JournalAstrophysical Journal
Volume720
Issue number1
DOIs
StatePublished - Sep 1 2010
Externally publishedYes

Fingerprint

planets
pollution
planet
stars
stellar magnetic fields
stellar activity
atmospheric pollution
stellar atmospheres
planetary systems
magnetic field
polarimeters
extrasolar planets
photosphere
astrophysics
condensation
signatures
analysis
magnetic fields
atmosphere
parameter

Keywords

  • Stars: abundances
  • Stars: fundamental parameters
  • Stars: individual (WASP-12)
  • Stars: magnetic field

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics
  • Nuclear and High Energy Physics

Cite this

Fossati, L., Bagnulo, S., Elmasli, A., Haswell, C. A., Holmes, S., Kochukhov, O., ... Hebb, L. (2010). A detailed spectropolarimetric analysis of the planet-hosting star WASP-12. Astrophysical Journal, 720(1), 872-886. https://doi.org/10.1088/0004-637X/720/1/872

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, Evgenya; Shulyak, D. V.; Bohlender, D.; Albayrak, B.; Froning, C.; Hebb, L.

In: Astrophysical Journal, Vol. 720, No. 1, 01.09.2010, p. 872-886.

Research output: Contribution to journalArticle

Fossati, L, Bagnulo, S, Elmasli, A, Haswell, CA, Holmes, S, Kochukhov, O, Shkolnik, E, Shulyak, DV, Bohlender, D, Albayrak, B, Froning, C & Hebb, L 2010, 'A detailed spectropolarimetric analysis of the planet-hosting star WASP-12', Astrophysical Journal, vol. 720, no. 1, pp. 872-886. https://doi.org/10.1088/0004-637X/720/1/872
Fossati L, Bagnulo S, Elmasli A, Haswell CA, Holmes S, Kochukhov O et al. A detailed spectropolarimetric analysis of the planet-hosting star WASP-12. Astrophysical Journal. 2010 Sep 1;720(1):872-886. https://doi.org/10.1088/0004-637X/720/1/872
Fossati, L. ; Bagnulo, S. ; Elmasli, A. ; Haswell, C. A. ; Holmes, S. ; Kochukhov, O. ; Shkolnik, Evgenya ; Shulyak, D. V. ; Bohlender, D. ; Albayrak, B. ; Froning, C. ; Hebb, L. / A detailed spectropolarimetric analysis of the planet-hosting star WASP-12. In: Astrophysical Journal. 2010 ; Vol. 720, No. 1. pp. 872-886.
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