T. Močnik
Recurring sets of recurring starspots on exoplanet-host Qatar-2
Močnik, T. ; Southworth, J.; Hellier, C.
Abstract
We announce the detection of recurring sets of recurring starspot occultation events in the short-cadence K2 light curve of Qatar-2, a K dwarf star transited every 1.34 d by a hot Jupiter. In total, we detect 34 individual starspot occultation events, caused by five different starspots, occulted in up to five consecutive transits or after a full stellar rotation. The longest recurring set of recurring starspot occultations spans over three stellar rotations, setting a lower limit for the longest starspot lifetime of 58 d. Starspot analysis provided a robust stellar rotational period measurement of 18.0 ± 0.2 d and indicates that the system is aligned, having a skyprojected obliquity of 0? ± 8?. A pronounced rotational modulation in the light curve has a period of 18.2 ± 1.6 d, in agreement with the rotational period derived from the starspot occultations. We tentatively detect an ellipsoidal modulation in the phase curve, with a semiamplitude of 18 ppm, but cannot exclude the possibility that this is the result of red noise or imperfect removal of the rotational modulation. We detect no transit-timing and transitduration variations with upper limits of 15 s and 1 min, respectively. We also reject any additional transiting planets with transit depths above 280 ppm in the orbital period region 0.5–30 d.
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 20, 2017 |
Online Publication Date | Jun 22, 2017 |
Publication Date | 2017-10 |
Publicly Available Date | May 26, 2023 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Publisher | Oxford University Press |
Peer Reviewed | Peer Reviewed |
Volume | 471 |
Issue | 1 |
Pages | 394-403 |
DOI | https://doi.org/10.1093/mnras/stx1557 |
Keywords | stars, fundamental parameters, individual, Qatar-2, planetary systems, starspots |
Publisher URL | http://dx.doi.org/10.1093/mnras/stx1557 |
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