The Rise of ROME. I. A Multiwavelength Analysis of the Star-Planet Interaction in the HD 189733 System

Abstract

Several "hot Jupiter" host stars appear to exhibit enhanced chromospheric activity, coronal flaring, and starspot development synchronized to their planetary orbits. These effects have been attributed to tidal and/or magnetic interactions between the star and exoplanet. The best studied among such systems is HD 189733, which has previously been observed from radio to X-ray wavelengths. Here, I present ~4.75 GHz Arecibo radio telescope observations of HD 189733 during a fraction of the exoplanet orbital phase range previously associated with enhanced coronal X-ray flaring. No radio flares from the lower corona were detected. I also leverage Microvariability and Oscillations of Stars, Automated Photoelectric Telescope, and Wise photometry to measure the occurences of minima associated with enhanced starspot activity. The phasing of these minima with the exoplanet orbit does not reveal any synchronized active region behavior. Moreover, for the first time, I combine X-ray, ultraviolet, photometric, Ca II H&K, H-alpha, and radio observations of HD 189733 to conduct an extensive, holistic reexamination of stellar activity in this system. Through the presentation of new data, and by merging physical and statistical analytic approaches, I demonstrate that the previously asserted enhancements in activity, allegedly synchronized to certain exoplanet orbital phases, are likely the result of inadequately sampled intrinsic stellar activity from an active star, rather than star-planet interactions.

Published in ApJ; 30 pages, 2 figures, 5 tables

References in corpus (22)

• Kepler Flares I. Active and Inactive M dwarfs
• The On/Off Nature of Star-Planet Interactions
• Hubble Space Telescope times-series photometry of the planetary transit of HD189733: no moon, no rings, starspots
• Stellar activity of planetary host star HD 189733
• The Transit Light Curve Project. V. System Parameters and Stellar Rotation Period of HD 189733
• Sun-as-a-Star Spectrum Variations 1974-2006
• Spectropolarimetric observations of the transiting planetary system of the K dwarf HD 189733
• The Arecibo Detection of the Coolest Radio-flaring Brown Dwarf
• The corona of HD 189733 and its X-ray activity
• Simultaneous Multi-Wavelength Observations of Magnetic Activity in Ultracool Dwarfs. I. The Complex Behavior of the M8.5 Dwarf TVLM513-46546
• Refined parameters of the planet orbiting HD 189733
• A stellar companion in the HD 189733 system with a known transiting extrasolar planet
• Ultra-high-time Resolution Observations of Radio Bursts on AD Leonis
• FUV variability of HD 189733. Is the star accreting material from its hot Jupiter?
• MOST Spacebased Photometry of the Transiting Exoplanet System HD 189733: Precise Timing Measurements for Transits Across an Active Star
• Kepler Flares IV: A Comprehensive Analysis of the Activity of the dM4e Star GJ 1243
• Looking for Super-Earths in the HD 189733 System: A Search for Transits in Most Space-Based Photometry
• The detection of variable radio emission from the fast rotating magnetic hot B-star HR7355 and evidence for its X-ray aurorae
• MOVES I. The evolving magnetic field of the planet-hosting star HD189733
• The Second Arecibo Search for 5 GHz Radio Flares from Ultracool Dwarfs
• The Discovery of Solar-like Activity Cycles Beyond the End of the Main Sequence?
• Radio-flaring Ultracool Dwarf Population Synthesis

Cited by in corpus (9)

• The search for radio emission from the exoplanetary systems 55 Cancri, $\upsilon$ Andromedae, and $\tau$ Boötis using LOFAR beam-formed observations
• MOVES III. Simultaneous X-ray and ultraviolet observations unveiling the variable environment of the hot Jupiter HD 189733b
• In search of radio emission from exoplanets: GMRT observations of the binary system HD~41004
• Space environment and magnetospheric Poynting fluxes of the exoplanet $\tau$ Boötis b
• ROME (Radio Observations of Magnetized Exoplanets). II. HD 189733 Does Not Accrete Significant Material from its Exoplanet like a T Tauri Star from A Disk
• Observational features of exoplanetary synchrotron radio bursts
• Flaring Latitudes in Ensembles of Low Mass Stars
• ROME IV. The Arecibo Search for Substellar Magnetospheric Radio Emissions in Purported Exoplanet-Hosting Systems at 5 GHz
• The Decline and Fall of ROME. V. A Preliminary Search for Star-Disrupted Planet Interactions and Coronal Activity at 5 GHz Among White Dwarfs within 25 pc