The Second Arecibo Search for 5 GHz Radio Flares from Ultracool Dwarfs

Abstract

We describe our second installment of the 4.75 GHz survey of ultracool dwarfs (UCDs) conducted with the Arecibo radio telescope, which has observed 27 such objects and resulted in the detection of sporadic flaring from the T6 dwarf, WISEPC J112254.73+255021.5. We also present follow up observations of the first radio-emitting T dwarf, 2MASS J10475385+2124234, a tentatively identified radio emitting L1 dwarf, 2MASS J1439284+192915, and the known radio-flaring source, 2MASS J13142039+132011 AB. Our new data indicate that 2MASS J1439284+192915 is not a radio flaring source. The overall detection rate of our unbiased survey for radio-flaring UCDs is ~5% for new sources, with a detection rate for each spectral class of ~5-10%. Evidently, radio luminosity of the UCDs does not appear to monotonically decline with spectral type from M7 dwarfs to giant planets, in contradiction to theories of the magnetic field generation and internal structure of these objects. Along with other, recently published results, our data exemplify the unique value of using radio surveys to reveal and study properties of substellar magnetic activity.

arXiv commentAccepted to ApJ; 14 pages, 4 figures

References in corpus (80)

• Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945
• Astrometry and Photometry for Cool Dwarfs and Brown Dwarfs
• Sixty-seven Additional L Dwarfs Discovered by the Two Micron All Sky Survey (2MASS)
• Theory of Low-Mass Stars and Substellar Objects
• Near-Infrared Photometry and Spectroscopy of L and T Dwarfs: the Effects of Temperature, Clouds, and Gravity
• The Interiors of Giant Planets: Models and Outstanding Questions
• New Neighbors from 2MASS: Activity and Kinematics at the Bottom of the Main Sequence
• Preliminary Parallaxes of 40 L and T Dwarfs from the U.S. Naval Observatory Infrared Astrometry Program
• The Spectra of T Dwarfs I: Near-Infrared Data and Spectral Classification
• Meeting the Cool New Neighbors V: A 2MASS-Selected Sample of Ultracool Dwarfs
• The First Hundred Brown Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)
• Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function
• Stellar Radio Astronomy. Probing Stellar Atmospheres from Protostars to Giants
• Simulations of dynamo action in fully convective stars
• Seventy-One New L and T Dwarfs from the Sloan Digital Sky Survey
• Meeting the Cool Neighbors. IX. The Luminosity Function of M7-L8 Ultracool Dwarfs in the Field
• The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs
• The First Direct Measurements of Magnetic Fields on Very Low-Mass Stars
• Confirmation of the Electron Cyclotron Maser Instability as the Dominant Source of Radio Emission from Very Low Mass Stars and Brown Dwarfs
• Activity in Very Cool Stars: Magnetic Dissipation in late-M and L Dwarf Atmospheres
• Radio Observations of a Large Sample of Late-M, L, and T Dwarfs: The Distribution of Magentic Field Strengths
• Periodic Bursts of Coherent Radio Emission from an Ultracool Dwarf
• Large-scale alpha^2-dynamo in low-mass stars and brown dwarfs
• A T8.5 Brown Dwarf Member of the Xi Ursae Majoris System
• The NIRSPEC Ultracool Dwarf Radial Velocity Survey
• Activity and Kinematics of Ultracool Dwarfs Including An Amazing Flare Observation
• Flaring Up All Over -- Radio Activity in Rapidly-Rotating Late-Type M and L Dwarfs
• The Spectra of T Dwarfs. II. Red Optical Data
• Discovery of 11 New T Dwarfs in the Two Micron All-Sky Survey, Including a Possible L/T Transition Binary
• Colors and Kinematics of L Dwarfs From the Sloan Digital Sky Survey
• Magnetospherically driven optical and radio aurorae at the end of the stellar main sequence
• Rotational Modulation of the Radio Emission from the M9 Dwarf TVLM 513-46546: Broadband Coherent Emission at the Substellar Boundary?
• Simultaneous Multi-Wavelength Observations of Magnetic Activity in Ultracool Dwarfs. III. X-ray, Radio, and H-alpha Activity Trends in M and L Dwarfs
• Rapidly Rotating Suns and Active Nests of Convection
• Reconnaissance of the HR 8799 Exosolar System I: Near IR Spectroscopy
• The Relationship Between Solar Radio and Hard X-ray Emission
• Auroral radio emission from late L and T dwarfs: A new constraint on dynamo theory in the substellar regime
• Exploring the substellar temperature regime down to ~550K
• The Radio Activity-Rotation Relation of Ultracool Dwarfs
• The near-infrared spectral energy distribution of β Pictoris b
• Periodic Radio and H-alpha Emission from the L Dwarf Binary 2MASSW J0746425+200032: Exploring the Magnetic Field Topology and Radius of an L Dwarf
• The Magnetic Properties of an L Dwarf Derived from Simultaneous Radio, X-ray, and H-alpha Observations
• Forty seven new T dwarfs from the UKIDSS Large Area Survey
• Trends in Ultracool Dwarf Magnetism. I. X-Ray Suppression and Radio Enhancement
• Deciphering Solar Magnetic Activity I: On The Relationship Between The Sunspot Cycle And The Evolution Of Small Magnetic Features
• Quiescent Radio Emission from Southern Late-type M Dwarfs and a Spectacular Radio Flare from the M8 Dwarf DENIS 1048-3956
• The Arecibo Detection of the Coolest Radio-flaring Brown Dwarf
• The properties of the T8.5p dwarf Ross 458C
• Simultaneous Multi-Wavelength Observations of Magnetic Activity in Ultracool Dwarfs. II. Mixed Trends in VB10 and LSR1835+32 and the Possible Role of Rotation
• Hip 63510C, Hip 73786B, and nine new isolated high proper motion T dwarf candidates from UKIDSS DR6 and SDSS DR7
• Simultaneous Multi-Wavelength Observations of Magnetic Activity in Ultracool Dwarfs. I. The Complex Behavior of the M8.5 Dwarf TVLM513-46546
• A new benchmark T8-9 brown dwarf and a couple of new mid-T dwarfs from the UKIDSS DR5+ LAS
• A Survey for H-alpha Emission from Late L dwarfs and T dwarfs
• Magnetospheric Emissions from the Planet Orbiting tau Boo: A Multi-Epoch Search
• New Neighbors: Parallaxes of 18 nearby stars selected from the LSPM-north catalog
• Discovery of Five Very Low Mass Close Binaries, Resolved in the Visible with Lucky Imaging
• Parallaxes and physical properties of 11 mid-to-late T dwarfs
• Periodic Radio Emission from the M7 Dwarf 2MASS J13142039+1320011: Implications for the Magnetic Field Topology
• The Radio Spectrum of TVLM513-46546: Constraints on the Coronal Properties of a Late M Dwarf
• A Chandra X-ray detection of the L dwarf binary Kelu-1: Simultaneous Chandra and Very Large Array observations
• Ultra-cool dwarfs: new discoveries, proper motions, and improved spectral typing from SDSS and 2MASS photometric colors
• Simultaneous Multiwavelength Observations of Magnetic Activity in Ultracool Dwarfs. IV. The Active, Young Binary NLTT 33370 AB (=2MASS J13142039+1320011)
• Wideband Dynamic Radio Spectra of Two Ultra-cool dwarfs
• The Rotation Period and Magnetic Field of the T Dwarf 2MASSI J1047539+212423 Measured From Periodic Radio Bursts
• Volume-limited radio survey of ultracool dwarfs
• WISE/2MASS-SDSS brown dwarfs candidates using Virtual Observatory tools
• Discovery of Radio Emission from the Tight M8 Binary: LP 349-25
• Radio Flaring from the T6 Dwarf WISEPC J112254.73+255021.5 with A Possible Ultra-short Periodicity
• Four new T dwarfs identified in PanSTARRS 1 commissioning data
• Reference study to characterise plasma and magnetic properties of ultra-cool atmospheres
• High-Precision Radio and Infrared Astrometry of LSPM J1314+1320AB - II: Testing Pre--Main-Sequence Models at the Lithium Depletion Boundary with Dynamical Masses
• A Mini-survey of Ultracool Dwarfs at 4.9 GHz
• Rotational Modulation of M/L Dwarfs due to Magnetic Spots
• Quasi-Quiescent Radio Emission from the First Radio-Emitting T Dwarf
• Radio detections of southern ultracool dwarfs
• The 5 GHz Arecibo Search for Radio Flares from Ultracool Dwarfs
• Serendipitous Discovery and Parallax of a Nearby L Dwarf
• Timing Analysis of the Periodic Radio and Optical Brightness Variations of the Ultracool Dwarf, TVLM 513-46546
• Detection of Radio Emission from the Hyperactive L Dwarf 2MASS J13153094-2649513AB
• High-Precision Radio and Infrared Astrometry of LSPM J1314+1320AB - I: Parallax, Proper Motions, and Limits on Planets

Cited by in corpus (24)

• A Panchromatic View of Brown Dwarf Aurorae
• K2 Ultracool Dwarfs Survey. III. White Light Flares are Ubiquitous in M6-L0 Dwarfs
• K2 Ultracool Dwarfs Survey II: The White Light Flare Rate of Young Brown Dwarfs
• Direct radio discovery of a cold brown dwarf
• The Discovery of Solar-like Activity Cycles Beyond the End of the Main Sequence?
• Periodic Radio Emission from the T8 Dwarf WISE J062309.94-045624.6
• Supermassive Hot Jupiters Provide More Favourable Conditions for the Generation of Radio Emission via the Cyclotron Maser Instability - A Case Study Based on Tau Bootis b
• The Rise of ROME. I. A Multiwavelength Analysis of the Star-Planet Interaction in the HD 189733 System
• Polarised radio pulsations from a new T dwarf binary
• Exoplanet Transits with Next-Generation Radio Telescopes
• Radio-flaring Ultracool Dwarf Population Synthesis
• On the Correlation between L Dwarf Optical and Infrared Variability and Radio Aurorae
• Radio Emission from Binary Ultracool Dwarf Systems
• The Occurrence Rate of Quiescent Radio Emission for Ultracool Dwarfs using a Generalized Semi-Analytical Bayesian Framework
• Plausible association of distant late M dwarfs with low-frequency radio emission
• J-PLUS: Discovery and characterisation of ultracool dwarfs using Virtual Observatory tools II. Second data release and machine learning methodology
• The Potential of Detecting Radio-flaring Ultracool Dwarfs at L band in the FAST Drift-scan Survey
• Tracing the Top-of-the-atmosphere and Vertical Cloud Structure of a fast-rotating late T-dwarf
• First Detection of Radio Emission Associated with a Classical Cepheid
• ROME IV. The Arecibo Search for Substellar Magnetospheric Radio Emissions in Purported Exoplanet-Hosting Systems at 5 GHz
• Is WISEP J060738.65+242953.4 Really A Magnetically Active, Pole-on L Dwarf?
• Radio Emission from a Nearby M dwarf Binary
• Simulations of Electron Beam Interactions in Brown Dwarf Atmospheres
• 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