Planetesimals Around Stars with TESS (PAST): I. Transient Dimming of a Binary Solar Analog at the End of the Planet Accretion Era

Abstract

We report detection of quasi-periodic (1.5 day) dimming of HD 240779, the solar-mass primary in a 5" visual binary (also TIC 284730577), by the Transiting Exoplanet Survey Satellite. This dimming, as has been shown for other "dipper" stars, is likely due to occultation by circumstellar dust. The barycentric space motion, lithium abundance, rotation, and chromospheric emission of the stars in this system point to an age of ~125 Myr, and possible membership in the AB Doradus moving group. As such it occupies an important but poorly explored intermediate regime of stars with transient dimming between young stellar objects in star forming regions and main sequence stars, and between UX Orionis-type Ae/Be stars and M-type "dippers". HD 240779, but not its companion BD+10714B, has WISE-detected excess infrared emission at 12 and 22 microns indicative of circumstellar dust. We propose that infrared emission is produced by collisions of planetesimals during clearing of a residual disk at the end of rocky planet formation, and that quasi-periodic dimming is produced by the rapid disintegration of a 100 km planetesimal near the silicate evaporation radius. Further studies of this and similar systems will illuminate a poorly understood final phase of rocky planet formation like that which produced the inner Solar System.

arXiv commentto appear in MNRAS

References in corpus (79)

• The Transiting Exoplanet Survey Satellite
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
• Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
• The Eccentric Kozai-Lidov Effect and Its Applications
• The TESS Input Catalog and Candidate Target List
• Density of asteroids
• Chromospheric CaII Emission in Nearby F, G, K, and M stars
• BANYAN. XI. The BANYAN $\Sigma$ multivariate Bayesian algorithm to identify members of young associations within 150 pc
• Galactic Reddening in 3D from Stellar Photometry - An Improved Map
• A disintegrating minor planet transiting a white dwarf
• Revised Catalog of GALEX Ultraviolet Sources. I. The All-sky Survey: GUVcat_AIS
• Gaia Data Release 2: Mapping the Milky Way disc kinematics
• The California Planet Survey I. Four New Giant Exoplanets
• CSI 2264: Simultaneous optical and infrared light curves of young disk-bearing stars in NGC 2264 with CoRoT and Spitzer-- evidence for multiple origins of variability
• Search for Associations Containing Young stars (SACY): I. Sample & Searching Method
• The California-Kepler Survey. I. High Resolution Spectroscopy of 1305 Stars Hosting Kepler Transiting Planets
• Debris Disks: Structure, Composition, and Variability
• Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library
• Planet Hunters X. KIC 8462852 - Where's the Flux?
• Asteroseismology and Gaia: Testing Scaling Relations Using 2200 Kepler Stars with TGAS Parallaxes
• YSOVAR: the first sensitive, wide-area, mid-IR photometric monitoring of the ONC
• Possible Disintegrating Short-Period Super-Mercury Orbiting KIC 12557548
• Rotation in the Pleiades with K2: I. Data and First Results
• Challenges in Planet Formation
• Lithium Depletion of Nearby Young Stellar Associations
• Accretion dynamics and disk evolution in NGC 2264: a study based on the Corot photometric observations
• The Age of AB Dor
• The K2-ESPRINT Project. I. Discovery of the Disintegrating Rocky Planet K2-22b with a Cometary Head and Leading Tail
• A Multi-Ringed, Modestly-Inclined Protoplanetary Disk around AA Tau
• Young "Dipper" Stars in Upper Sco and $\rho$ Oph Observed by K2
• AA Tau's sudden and long-lasting deepening: enhanced extinction by its circumstellar disk
• Orbits for the Impatient: A Bayesian Rejection Sampling Method for Quickly Fitting the Orbits of Long-Period Exoplanets
• The many-faceted light curves of young disk-bearing stars in Upper Sco and $\rho$ Oph observed by $K2$ Campaign 2
• The bright end of the exo-Zodi luminosity function: Disk evolution and implications for exo-Earth detectability
• Likely Transiting Exocomets Detected by Kepler
• CSI 2264: Characterizing Young Stars in NGC 2264 with Short-Duration, Periodic Flux Dips in their Light Curves
• Relating jet structure to photometric variability: the Herbig Ae star HD 163296
• The Hunt for Exomoons with Kepler (HEK): V. A Survey of 41 Planetary Candidates for Exomoons
• The lithium-rotation connection in the 125 Myr-old Pleiades cluster
• TESS reveals that the nearby Pisces-Eridanus stellar stream is only 120 Myr old
• Discovery of Tidal Tails in Disrupting Open Clusters: Coma Berenices and a Neighbor Stellar Group
• A Kine-Chemical Investigation of the AB Dor Moving Group "Stream"
• Revised Filter Profiles and Zero Points for Broadband Photometry
• A Self-Consistent Model of the Circumstellar Debris Created by a Giant Hypervelocity Impact in the HD172555 System
• The Mass and Structure of the Pleiades Star Cluster from 2MASS
• Transiting exocomets detected in broadband light by TESS in the $\beta$ Pictoris system
• Dippers and Dusty Disks Edges: A Unified Model
• Stellar activity with LAMOST - II. Chromospheric activity in open clusters
• Angular momentum evolution of young low-mass stars and brown dwarfs: observations and theory
• On the common origin of the AB Dor moving group and the Pleiades cluster
• Complex Rotational Modulation of Rapidly Rotating M-Stars Observed with TESS
• Dipper disks not inclined towards edge-on orbits
• Disk-Related Bursts and Fades in Young Stars
• Zodiacal Exoplanets in Time (ZEIT) II. A "Super-Earth" Orbiting a Young K Dwarf in the Pleiades Neighborhood
• Extreme Debris Disk Variability -- Exploring the Diverse Outcomes of Large Asteroid Impacts During the Era of Terrestrial Planet Formation
• New and Known Moving Groups And Clusters Identified in a Gaia Co-Moving Catalog
• SOHO Comets: 20-Years and 3,000 Objects Later
• ALMA Reveals a Misaligned Inner Gas Disk inside the Large Cavity of a Transitional Disk
• Modelling the KIC8462852 light curves: compatibility of the dips and secular dimming with an exocomet interpretation
• Spectroscopic properties of cool Ursa Major group members
• A substellar component orbiting the F-star 30 Ari B
• Identifying Young $Kepler$ Planet Host Stars from Keck-HIRES Spectra of Lithium
• More Rapidly Rotating PMS M Dwarfs with Light Curves Suggestive of Orbiting Clouds of Material
• The transiting dust clumps in the evolved disk of the Sun-like UXor RZ Psc
• The Light Curve of the Weakly-Accreting T Tauri Binary KH 15D from 2005-10: Insights into the Nature of its Protoplanetary Disk
• Revision of Stellar Intrinsic Colors in the Infrared by the Spectroscopic Surveys
• An active asteroid belt causing the UX Ori phenomenon in RZ Psc
• ROBOSPECT: Automated Equivalent Width Measurement
• The evolutionary status of the UX Orionis star RZ Piscium
• Characterizing the AB Doradus Moving Group Via High Resolution Spectroscopy and Kinematic Traceback
• The Little Dippers: Transits of Star-grazing Exocomets?
• Simultaneous spectral energy distribution and near-infrared interferometry modeling of HD 142666
• Is the Young Star RZ Piscium Consuming Its Own (Planetary) Offspring?
• Variability of Disk Emission in Pre-Main Sequence and Related Stars IV. Investigating the Structural Changes in the Inner Disk Region of MWC 480
• Probing the origin of UX Ori-type variability in the YSO binary CO Ori with VLTI/GRAVITY
• The Double Dust Envelopes of R Coronae Borealis Stars
• Mid-infrared interferometric variability of DG Tau: implications for the inner-disk structure
• The inner circumstellar disk of the UX Ori star V1026 Sco

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• Planetesimals Around Stars with TESS (PAST): II. An M Dwarf "Dipper" Star with a Long-Lived Disk in the TESS Continuous Viewing Zone
• Highly structured inner planetary system debris around the intermediate age Sun-like star TYC 8830 410 1
• Large Interferometer For Exoplanets (LIFE). XIV. Finding terrestrial protoplanets in the galactic neighborhood
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• Climate Change in Hell: Long-Term Variation in Transits of the Evaporating Planet K2-22b
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• Dippers from TESS Full-frame Images. II. Spectroscopic Characterization of Four Young Dippers
• The Visual Survey Group: A Decade of Hunting Exoplanets and Unusual Stellar Events with Space-Based Telescopes