Bridging the gap -- the disappearance of the intermediate period gap for fully convective stars, uncovered by new ZTF rotation periods

Abstract

The intermediate period gap, discovered by Kepler, is an observed dearth of stellar rotation periods in the temperature-period diagram at $\sim$ 20 days for G dwarfs and up to $\sim$ 30 days for early-M dwarfs. However, because Kepler mainly targeted solar-like stars, there is a lack of measured periods for M dwarfs, especially those at the fully convective limit. Therefore it is unclear if the intermediate period gap exists for mid- to late-M dwarfs. Here, we present a period catalog containing 40,553 rotation periods (9,535 periods $>$ 10 days), measured using the Zwicky Transient Facility (ZTF). To measure these periods, we developed a simple pipeline that improves directly on the ZTF archival light curves and reduces the photometric scatter by 26%, on average. This new catalog spans a range of stellar temperatures that connect samples from Kepler with MEarth, a ground-based time domain survey of bright M-dwarfs, and reveals that the intermediate period gap closes at the theoretically predicted location of the fully convective boundary ($G_{\mathrm{BP}}-G_{\mathrm{RP}}\sim 2.45$ mag). This result supports the hypothesis that the gap is caused by core-envelope interactions. Using gyro-kinematic ages, we also find a potential rapid spin-down of stars across this period gap.

References in corpus (24)

• Array Programming with NumPy
• The Transiting Exoplanet Survey Satellite
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• The Dartmouth Stellar Evolution Database
• The K2 Mission: Characterization and Early results
• Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• astroquery: An Astronomical Web-Querying Package in Python
• Improving PARSEC models for very low mass stars
• Measuring the rotation period distribution of field M-dwarfs with Kepler
• The Zwicky Transient Facility Catalog of Periodic Variable Stars
• The Mass-Dependence of Angular Momentum Evolution in Sun-Like Stars
• A spin-down clock for cool stars from observations of a 2.5-billion-year-old cluster
• K2 rotation periods for low-mass Hyads and a quantitative comparison of the distribution of slow rotators in the Hyades and Praesepe
• Surface rotation and photometric activity for Kepler targets. II. G and F main-sequence stars, and cool subgiant stars
• A Temporary Epoch of Stalled Spin-Down for Low-Mass Stars: Insights from NGC 6811 with Gaia and Kepler
• Weakened magnetic braking supported by asteroseismic rotation rates of Kepler dwarfs
• The age-velocity dispersion relation of the Galactic discs from LAMOST-Gaia data
• The Metastable Dynamo Model of Stellar Rotational Evolution
• Exploring the evolution of stellar rotation using Galactic kinematics
• Rotating Stars from Kepler Observed with Gaia DR1
• Gaia Gaps and the Physics of Low-Mass Stars. I. The Fully Convective Boundary
• The Vertical Metallicity Gradient of the Milky Way Disk: Transitions in [a/Fe] Populations
• Periodic stellar variability from almost a million NGTS light curves

Cited by in corpus (4)

• Temporal variation of the photometric magnetic activity for the Sun and Kepler solar-like stars
• Kepler main-sequence solar-like stars: surface rotation and magnetic-activity evolution
• The Solar Neighborhood LI: A Variability Survey of Nearby M Dwarfs with Planets from Months to Decades with TESS and the CTIO/SMARTS 0.9 m Telescope
• Unravelling the Period Gap using LAMOST Chromospheric Activity Indices