Planetary Collisions outside the Solar System: Time Domain Characterization of Extreme Debris Disks

Abstract

Luminous debris disks of warm dust in the terrestrial planet zones around solar-like stars are recently found to vary, indicative of ongoing large-scale collisions of rocky objects. We use Spitzer 3.6 and 4.5 μm time-series observations in 2012 and 2013 (extended to 2014 in one case) to monitor 5 more debris disks with unusually high fractional luminosities ("extreme debris disk"), including P1121 in the open cluster M47 (80 Myr), HD 15407A in the AB Dor moving group (80 Myr), HD 23514 in the Pleiades (120 Myr), HD 145263 in the Upper Sco Association (10 Myr), and the field star BD+20 307 (>1 Gyr). Together with the published results for ID8 in NGC 2547 (35 Myr), this makes the first systematic time-domain investigation of planetary impacts outside the solar system. Significant variations with timescales shorter than a year are detected in five out of the six extreme debris disks we have monitored. However, different systems show diverse sets of characteristics in the time domain, including long-term decay or growth, disk temperature variations, and possible periodicity.

arXiv comment50 pages, 14 figures, 9 tables; Accepted for publication in the Astrophysical Journal

References in corpus (50)

• The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
• The Infrared Spectrograph on the Spitzer Space Telescope
• The false positive rate of Kepler and the occurrence of planets
• A Revised Age for Upper Scorpius and The Star-Formation History Among the F-Type Members of the Scorpius-Centaurus OB Association
• 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
• Debris Disk Evolution Around A Stars
• Transience of hot dust around sun-like stars
• Infrared Signatures of Disrupted Minor Planets at White Dwarfs
• CASSIS: The Cornell Atlas of Spitzer/IRS Sources
• Collisional Processes in Extrasolar Planetsimal Disks - Dust Clumps in Fomalhaut's Debris Disk
• A 40 Myr Old Gaseous Circumstellar Disk at 49 Ceti: Massive CO-Rich Comet Clouds at Young A-Type Stars
• SigSpec - I. Frequency- and Phase-Resolved Significance in Fourier Space
• Terrestrial Planet Formation I. The Transition from Oligarchic Growth to Chaotic Growth
• From planetesimals to terrestrial planets: N-body simulations including the effects of nebular gas and giant planets
• TASS Mark IV Photometric Survey of the Northern Sky
• The Collisional Evolution of Debris Disks
• Abundant Circumstellar Silica Dust and SiO Gas Created by a Giant Hypervelocity Collision in the ~12 Myr HD172555 System
• Prospects for Detection of Catastrophic Collisions in Debris Disks
• Debris from terrestrial planet formation: the Moon-forming collision
• A heuristic derivation of the uncertainty of the frequency determination in time series data
• Modeling Collisional Cascades In Debris Disks: Steep Dust-Size Distributions
• Rapid disappearance of a warm, dusty circumstellar disk
• Large Impacts around a Solar Analog Star in the Era of Terrestrial Planet Formation
• Young Stellar Object Variability (YSOVAR): Long Timescale Variations in the Mid-Infrared
• Near-Infrared Variability in the 2MASS Calibration Fields: A Search for Planetary Transit Candidates
• Warm dust in the terrestrial planet zone of a sun-like Pleiad: collisions between planetary embryos?
• Collisional dust avalanches in debris discs
• Detection of crystalline silicates around the T Tauri star Hen 3-600A
• Transient dust in warm debris disks - Detection of Fe-rich olivine grains
• A Self-Consistent Model of the Circumstellar Debris Created by a Giant Hypervelocity Impact in the HD172555 System
• The Age of the HD 15407 System and the Epoch of Final Catastrophic Mass Accretion onto Terrestrial Planets around Sun-like Stars
• Calibrated griz magnitudes of Tycho stars: All-sky photometric calibration using bright stars
• Variability of the Infrared Excess of Extreme Debris Disks
• Debris Disks in NGC 2547
• Direct Imaging Search for Extrasolar Planets in the Pleiades
• New debris disk candidates: 24 micron stellar excesses at 100 Myr
• Planetary embryos and planetesimals residing in thin debris disks
• SPITZER/IRAC-MIPS Survey of NGC2451A and B: Debris Disks at 50-80 million years
• The Absence of Cold Dust and the Mineralogy and Origin of the Warm Dust Encircling BD +20 307
• Crystalline Silicate Feature of the Vega-like star HD145263
• A Multiplicity Census of Intermediate-Mass Stars in Scorpius-Centaurus
• Planetary systems around close binary stars: the case of the very dusty, Sun-like, spectroscopic binary BD+20 307
• Kinks and Dents in Protoplanetary Disks: Rapid Infrared Variability as Evidence for Large Structural Perturbations
• Silica-Rich Bright Debris Disk around HD 15407A
• Luminosity and Mass Function of the Galactic open cluster NGC 2422
• A Substellar Companion to the Dusty Pleiades Star HD 23514
• On the Binary Nature of Dust-encircled BD+20 307
• Dust from collisions: A way to probe the composition of exo-planets?
• The nearby, young, isolated, dusty star HD 166191
• The Absence of Cold Dust around Warm Debris Disk Star HD 15407A

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• Debris Disks: Structure, Composition, and Variability
• Circumstellar Debris and Pollution at White Dwarf Stars
• Solar System Physics for Exoplanet Research
• Dust Production and Depletion in Evolved Planetary Systems
• KIC 8462852 - The Infrared Flux
• Extreme Debris Disk Variability -- Exploring the Diverse Outcomes of Large Asteroid Impacts During the Era of Terrestrial Planet Formation
• Insights into planet formation from debris disks: II. Giant impacts in extrasolar planetary systems
• Variations on Debris Disks III. Collisional Cascades and Giant Impacts in the Terrestrial Zones of Solar-type Stars
• The transiting dust clumps in the evolved disk of the Sun-like UXor RZ Psc
• A new sample of warm extreme debris disks from the ALLWISE catalog
• Extinction and the Dimming of KIC 8462852
• Follow-up Imaging of Disk Candidates from the Disk Detective Citizen Science Project: New Discoveries and False-Positives in WISE Circumstellar Disk Surveys
• Mid-infrared Studies of HD 113766 and HD 172555: Assessing Variability in the Terrestrial Zone of Young Exoplanetary Systems
• The Planet Formation Potential Around a 45 Myr old Accreting M Dwarf
• Extreme Variability of the V488 Persei Debris Disk
• HD 145263: Spectral Observations of Silica Debris Disk Formation via Extreme Space Weathering?
• Transient events in bright debris discs: Collisional avalanches revisited
• Variability in young very low mass stars: Two surprises from spectrophotometric monitoring
• Planetary Embryo Collisions and the Wiggly Nature of Extreme Debris Disks
• Studying the Evolution of Warm Dust Encircling BD +20 307 Using SOFIA
• Debris Disks: Probing Planet Formation
• Circumstellar discs: What will be next?
• Disks in Nearby Young Stellar Associations Found Via Virtual Reality
• Collisions of Terrestrial Worlds: The Occurrence of Extreme Mid-Infrared Excesses around Low-Mass Field Stars
• Searching for Biosignatures in Exoplanetary Impact Ejecta
• Sudden extreme obscuration of a Sun-like main-sequence star: evolution of the circumstellar dust around ASASSN-21qj
• Skynet Algorithm for Single-Dish Radio Mapping I: Contaminant-Cleaning, Mapping, and Photometering Small-Scale Structures
• Variable warm dust around the Herbig Ae star HD~169142: Birth of a ring?
• Mid-infrared time-domain study of recent dust production events in the extreme debris disc of TYC 4209-1322-1
• Catastrophic events in protoplanetary disks and their observational manifestations
• One of Everything: The Breakthrough Listen Exotica Catalog
• Isolating the extreme debris disc signature -- explorations of eccentric extreme debris discs formed by giant impacts
• Abundant sub-micron grains revealed in newly discovered extreme debris discs
• Can the dustiest main sequence stars tell us about the rocky planet formation process?
• Super-earths and mini-neptunes follow different orbital period-eccentricity relations
• On The Unusual Variability of 2MASS J06195260-2903592: A Long-Lived Disk around a Young Ultracool Dwarf
• Ancillary science with Ariel: Feasibility and scientific potential of young stellar object observations
• The HOSTS Survey: Suspected variable dust emission and constraints on companions around θ Boo