Spin-orbit alignment for 110 day period KOI368.01 from gravity darkening

Journal Article · Sat May 10 00:00:00 EDT 2014 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/786/2/131· OSTI ID:22356941

Ahlers, John P.; Seubert, Shayne A.; Barnes, Jason W. ^[1]

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1. Department of Physics, University of Idaho, 875 Perimeter Drive Stop 440903, Moscow, ID 83844-0903 (United States)

We fit the Kepler photometric light curve of the KOI-368 system using an oblate, gravity-darkened stellar model in order to constrain its spin-orbit alignment. We find that the system is relatively well-aligned with a sky-projected spin-orbit alignment of λ = 10° ± 2°, a stellar obliquity of ψ = 3° ± 7°, and a true spin-orbit alignment of ψ = 11° ± 3°. Although our measurement differs significantly from zero, the low value for ψ is consistent with spin-orbit alignment. We also measure various transit parameters of the KOI-368 system: R {sub KOI-368} = 2.28 ± 0.02 R {sub ☉}, R{sub p} = 1.83 ± 0.02 R {sub jup}, and i = 89.°221 ± 0.°013. This work shows that our gravity-darkened model can constrain long-period, well-aligned planets and M-class stars orbiting fast-rotators, allowing for measurement of a new subcategory of transiting bodies.

• OSTI ID: 22356941
• Journal Information: Astrophysical Journal, Vol. 786, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ALIGNMENT
COSMOLOGICAL MODELS
ECLIPSE
GRAVITATION
L-S COUPLING
ORBITS
PHOTOMETRY
PLANETS
SATELLITES
SPIN
STARS
VISIBLE RADIATION