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

Abstract

The recent discovery of planetesimals orbiting white dwarfs has renewed interest in the final chapters of the evolution of planetary systems. Although observational and theoretical studies have examined the dynamical evolution of these systems, studies of their magnetic star-planet interactions, as powered by unipolar induction, have thus far only been assessed theoretically. This fifth paper of the ROME (Radio Observations of Magnetized Exoplanets) series presents the results of a targeted mini-survey of nine white dwarfs within 25 pc without known stellar mass companions in search of radio emissions generated by magnetic interactions between white dwarfs and their planetary remnants. This $\sim$5 GHz Arecibo radio telescope survey achieved mJy-level sensitivity over $<$1 s integration times. Although no exoplanet-induced stellar radio flares were detected, this is the first survey to search for magnetic star-planet interactions between white dwarfs and planetary companions, cores, or disrupted planetesimals. It is also the most extensive and sensitive radio survey for intrinsic coronal emissions from apparently isolated white dwarfs. The study of radio emissions from white dwarf systems may present a new means to detect and measure DC and DQ magnetic fields, search for white dwarf coronae, characterize the density and spatial distribution of white dwarf magnetospheric plasma, characterize the dynamical and electrical properties of planetary cores, and offer new constraints on the modeling of double degenerate merger events.

arXiv comment14 pages, 3 tables, 2 figures. Summary presented at the 56th Annual Meeting of the AAS Division for Planetary Sciences, abstract 407.04

References in corpus (50)

• Gaia Data Release 2. Summary of the contents and survey properties
• A disintegrating minor planet transiting a white dwarf
• A Spectroscopic Survey & Analysis of Bright, Hydrogen-Rich White Dwarfs
• Infrared Signatures of Disrupted Minor Planets at White Dwarfs
• Accretion and diffusion in white dwarfs. New diffusion timescales and applications to GD362 and G29-38
• Key Aspects of Coronal Heating
• A radio pulsing white dwarf binary star
• Low Luminosity Companions to White Dwarfs
• White Dwarf Rotation as a Function of Mass and a Dichotomy of Mode Linewidths: Kepler Observations of 27 Pulsating DA White Dwarfs Through K2 Campaign 8
• Spectroscopy of New High Proper Motion Stars in the Northern Sky. I. New Nearby Stars, New High Velocity Stars, and an Enhanced Classification Scheme for M Dwarfs
• The binarity of the local white dwarf population
• A planetesimal orbiting within the debris disc around a white dwarf star
• Global Models of Runaway Accretion in White Dwarf Debris Disks
• Current challenges in the physics of white dwarf stars
• Recent advances in coronal heating
• Magnetic fields in isolated and interacting white dwarfs
• The origin and evolution of magnetic white dwarfs in close binary stars
• A Chandra Search for Coronal X Rays from the Cool White Dwarf GD 356
• The White Dwarfs within 20 Parsecs of the Sun: Kinematics and Statistics
• A common origin of magnetism from planets to white dwarfs
• Polarimetric evidence of a white dwarf pulsar in the binary system AR Scorpii
• New insight into the magnetism of degenerate stars from the analysis of a volume limited sample of white dwarfs
• Microwave plasma emission of a flare on AD Leo
• Electron-cyclotron maser emission from white-dwarf pairs and white-dwarf planetary systems
• Recurring Planetary Debris Transits and Circumstellar Gas around White Dwarf ZTF J0328$-$1219
• WD1953-011 - a magnetic white dwarf with peculiar field structure
• An Isolated White Dwarf with a 70 second Spin Period
• The polluted atmospheres of cool white dwarfs and the magnetic field connection
• Infrared Excesses around Bright White Dwarfs from Gaia and unWISE I
• Radio Flaring from the T6 Dwarf WISEPC J112254.73+255021.5 with A Possible Ultra-short Periodicity
• Evidence of enhanced magnetism in cool, polluted white dwarfs
• Magnetism, X-rays, and Accretion Rates in WD 1145+017 and other Polluted White Dwarf Systems
• Searching for the weakest detectable magnetic fields in white dwarfs. Highly-sensitive measurements from first VLT and WHT surveys
• The Second Arecibo Search for 5 GHz Radio Flares from Ultracool Dwarfs
• The 5 GHz Arecibo Search for Radio Flares from Ultracool Dwarfs
• VLA Radio Observations of AR Sco
• Discovery of weak magnetic fields in four DZ white dwarfs in the local 20pc volume. Implications for the frequency of magnetic fields with cooling age
• Highly sensitive search for magnetic fields in white dwarfs using broad-band circular polarimetry
• Magnetospherically-trapped dust and a possible model for the unusual transits at WD 1145+017
• The Rise of ROME. I. A Multiwavelength Analysis of the Star-Planet Interaction in the HD 189733 System
• Ohmic heating of asteroids around magnetic stars
• Survivability of radio-loud planetary cores orbiting white dwarfs
• A test of the planet-star unipolar inductor for magnetic white dwarfs
• Hidden in Plain Sight: A Double-lined White Dwarf Binary 26 pc Away and a Distant Cousin
• A CHEOPS White Dwarf Transit Search
• Extreme abundance ratios in the polluted atmosphere of the cool white dwarf NLTT19868
• Discovery of magnetic fields in five DC white dwarfs
• Discovery of magnetically guided metal accretion onto a polluted white dwarf
• ROME III. The Arecibo Search for Star-Planet Interactions at 5 GHz
• ROME IV. The Arecibo Search for Substellar Magnetospheric Radio Emissions in Purported Exoplanet-Hosting Systems at 5 GHz