Stellar rotational periods in the planet hosting open cluster Praesepe

Abstract

By using the dense coverage of the extrasolar planet survey project HATNet, we Fourier analyze 381 high-probability members of the nearby open cluster Praesepe (Beehive/M44/NGC 2632). In addition to the detection of 10 variables (of δScuti and other types), we identify 180 rotational variables (including the two known planet hosts). This sample increases the number of known rotational variables in this cluster for spectral classes earlier than M by more than a factor of three. These stars closely follow a color/magnitude -- period relation from early F to late K stars. We approximate this relation by polynomials for an easier reference to the rotational characteristics in different colors. The total (peak-to-peak) amplitudes of the large majority (94%) of these variables span the range of 0.005 to 0.04 mag. The periods cover a range from 2.5 to 15 days. These data strongly confirm that Praesepe and the Hyades have the same gyrochronological ages. Regarding the two planet hosts, Pr0211 (the one with the shorter orbital period) has a rotational period that is ~2 days shorter than the one expected from the main rotational pattern in this cluster. This, together with other examples discussed in the paper, may hint that star-planet interaction via tidal dissipation can be significant in some cases in the rotational evolution of stars hosting Hot Jupiters.

17 pages, 13 figures, 5 tables; accepted for publication in MNRAS

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Cited by in corpus (13)

• K2 rotation periods for low-mass Hyads and a quantitative comparison of the distribution of slow rotators in the Hyades and Praesepe
• The Factory and The Beehive II. Activity and Rotation in Praesepe and the Hyades
• The Age and Age Spread of the Praesepe and Hyades Clusters: a Consistent, ~800 Myr Picture from Rotating Stellar Models
• Stellar activity with LAMOST - II. Chromospheric activity in open clusters
• A PSF-based approach to Kepler/K2 data. II. Exoplanet candidates in Praesepe (M 44)
• Three K2 Campaigns Yield Rotation Periods for 1013 Stars in Praesepe
• Stellar Spins in the Pleiades, Praesepe, and M35 Open Clusters
• Pearls on a String: Numerous Stellar Clusters Strung along the Same Orbit
• The Interferometric Binary Epsilon Cancri in Praesepe: Precise Masses and Age
• Search for giant planets around seven white dwarfs in the Hyades cluster with the Hubble Space Telescope
• A rotational age for the open cluster NGC 2281
• Stellar activity with LAMOST. III. Temporal variability pattern in Pleiades, Praesepe, and Hyades
• Spatial distribution of exoplanet candidates based on Kepler and $Gaia$ data