STARSPOTS ON WASP-85

Journal Article · Wed Jun 01 04:00:00 EDT 2016 · The Astronomical Journal (Online)

DOI:https://doi.org/10.3847/0004-6256/151/6/150· OSTI ID:22862928

Močnik, T.; Clark, B. J. M.; Anderson, D. R.; Hellier, C. ^[1]; Brown, D. J. A., ^[2]

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1. Astrophysics Group, Keele University, Staffordshire, ST5 5BG (United Kingdom)
2. Department of Physics, University of Warwick, Coventry, CV4 7AL (United Kingdom)

By analyzing K2 short-cadence observations, we detect starspots on WASP-85A, the host star of the hot Jupiter WASP-85Ab. The detection of recurring starspot occultation events indicates that the planet’s orbit is aligned with the star’s rotational axis (λ<14°) and suggests a stellar rotational period of 15.1 ± 0.6 days. The K2 light curve reveals a rotational modulation with a period of 13.6 ± 1.6 days, which is consistent with the period determined from starspots. There are no significant transit-timing variations, and thus no evidence of any additional planet in the system. Given the pronounced rotational modulation, we are only able to place an upper limit of 100 parts per million for any phase-curve modulations and the secondary eclipse.

• OSTI ID: 22862928
• Journal Information: The Astronomical Journal (Online), Journal Name: The Astronomical Journal (Online) Journal Issue: 6 Vol. 151; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
DETECTION
ECLIPSE
JUPITER PLANET
MODULATION
ORBITS
SATELLITES
STARS
STARSPOTS