Asymmetric transit curves as indication of orbital obliquity

Clues from the late-type dwarf companion in KOI-13

G. M. Szabó, R. Szabó, J. Benkő, H. Lehmann, Gy Mez, A. E. Simon, Zs Kvri, G. Hodosn, Zs Regly, L. L. Kiss

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

KOI-13.01, a planet-sized companion in an optical double star, was announced as one of the 1235 Kepler planet candidates in 2011 February. The transit curves show significant distortion that was stable over the ∼130 days time span of the data. Here we investigate the phenomenon via detailed analyses of the two components of the double star and a re-reduction of the Kepler data with pixel-level photometry. Our results indicate that KOI-13 is a common proper motion binary, with two rapidly rotating components (vsin i ≈65-70kms-1). We identify the host star of KOI-13.01 and conclude that the transit curve asymmetry is consistent with a companion orbiting a rapidly rotating, possibly elongated star on an oblique orbit. The radius of the transiter is 2.2 RJ , implying an irradiated late-type dwarf, probably a hot brown dwarf rather than a planet. KOI-13 is the first example for detecting orbital obliquity for a substellar companion without measuring the Rossiter-McLaughlin effect with spectroscopy.

Original languageEnglish
Article numberL4
JournalAstrophysical Journal Letters
Volume736
Issue number1
DOIs
Publication statusPublished - Jul 20 2011

Fingerprint

obliquity
transit
double stars
planets
indication
planet
orbitals
curves
stars
proper motion
daytime
photometry
asymmetry
pixel
pixels
spectroscopy
orbits
radii

Keywords

  • binaries: visual
  • brown dwarfs
  • stars: individual (CCDM J19079+4652AB, KOI-13)

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Asymmetric transit curves as indication of orbital obliquity : Clues from the late-type dwarf companion in KOI-13. / Szabó, G. M.; Szabó, R.; Benkő, J.; Lehmann, H.; Mez, Gy; Simon, A. E.; Kvri, Zs; Hodosn, G.; Regly, Zs; Kiss, L. L.

In: Astrophysical Journal Letters, Vol. 736, No. 1, L4, 20.07.2011.

Research output: Contribution to journalArticle

Szabó, G. M. ; Szabó, R. ; Benkő, J. ; Lehmann, H. ; Mez, Gy ; Simon, A. E. ; Kvri, Zs ; Hodosn, G. ; Regly, Zs ; Kiss, L. L. / Asymmetric transit curves as indication of orbital obliquity : Clues from the late-type dwarf companion in KOI-13. In: Astrophysical Journal Letters. 2011 ; Vol. 736, No. 1.
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N2 - KOI-13.01, a planet-sized companion in an optical double star, was announced as one of the 1235 Kepler planet candidates in 2011 February. The transit curves show significant distortion that was stable over the ∼130 days time span of the data. Here we investigate the phenomenon via detailed analyses of the two components of the double star and a re-reduction of the Kepler data with pixel-level photometry. Our results indicate that KOI-13 is a common proper motion binary, with two rapidly rotating components (vsin i ≈65-70kms-1). We identify the host star of KOI-13.01 and conclude that the transit curve asymmetry is consistent with a companion orbiting a rapidly rotating, possibly elongated star on an oblique orbit. The radius of the transiter is 2.2 RJ , implying an irradiated late-type dwarf, probably a hot brown dwarf rather than a planet. KOI-13 is the first example for detecting orbital obliquity for a substellar companion without measuring the Rossiter-McLaughlin effect with spectroscopy.

AB - KOI-13.01, a planet-sized companion in an optical double star, was announced as one of the 1235 Kepler planet candidates in 2011 February. The transit curves show significant distortion that was stable over the ∼130 days time span of the data. Here we investigate the phenomenon via detailed analyses of the two components of the double star and a re-reduction of the Kepler data with pixel-level photometry. Our results indicate that KOI-13 is a common proper motion binary, with two rapidly rotating components (vsin i ≈65-70kms-1). We identify the host star of KOI-13.01 and conclude that the transit curve asymmetry is consistent with a companion orbiting a rapidly rotating, possibly elongated star on an oblique orbit. The radius of the transiter is 2.2 RJ , implying an irradiated late-type dwarf, probably a hot brown dwarf rather than a planet. KOI-13 is the first example for detecting orbital obliquity for a substellar companion without measuring the Rossiter-McLaughlin effect with spectroscopy.

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