88 citations · 714 across the 22 of their papers we have counts for
23 papers
Search for Ultra-Relativistic Magnetic Monopoles with LHAASO-KM2A
Zhen Cao, F. Aharonian, Y. X. Bai +335
Ultra-relativistic magnetic monopoles traversing the atmosphere are expected to initiate extensive air showers characterized by a muon deficit and a compact lateral profile. Using…
Benchmark brown dwarfs -- I. A blue M2 + T5 wide binary and a probable young [M4 + M4] + [T7 + T8] hierarchical quadruple
Z. H. Zhang, F. Navarete, M. C. Galvez-Ortiz +13
Benchmark brown dwarfs in wide binary systems are crucial for characterizing substellar objects and calibrating atmospheric and evolutionary models. However, brown dwarf benchmarks…
Primeval very low-mass stars and brown dwarfs -- VIII. The first age benchmark L subdwarf, a wide companion to a halo white dwarf
Z. H. Zhang, R. Raddi, A. J. Burgasser +12
We report the discovery of five white dwarf + ultracool dwarf systems identified as common proper motion wide binaries in the Gaia Catalogue of Nearby Stars. The discoveries includ…
In Situ Detection of Kinetic-Size Magnetic Holes in the Martian Magnetosheath
S. Y. Huang, R. T. Lin, Z. G. Yuan +7
Depression in magnetic field strength with a scale below one proton gyroradius is referred to as kinetic-size magnetic hole (KSMH). KSMHs are frequently observed near terrestrial s…
Observational Evidence of Magnetic Reconnection in the Terrestrial Foreshock Region
K. Jiang, S. Y. Huang, H. S. Fu +10
Electron heating/acceleration in the foreshock, by which electrons may be energized beyond thermal energies prior to encountering the bow shock, is very important for the bow shock…
Primeval very low-mass stars and brown dwarfs - VI. Population properties of metal-poor degenerate brown dwarfs
Z. H. Zhang, A. J. Burgasser, M. C. Galvez-Ortiz +4
We presented 15 new T dwarfs that were selected from UKIRT Infrared Deep Sky Survey, Visible and Infrared Survey Telescope for Astronomy, and Wide-field Infrared Survey Explorer su…
Primeval very low-mass stars and brown dwarfs - V. A halo L3 subdwarf with prograde eccentric orbit in the Galactic plane
Z. H. Zhang, A. J. Burgasser, L. C. Smith
VVV J125641636202039 is an L subdwarf located in the Galactic plane ( = 0.831 deg) discovered by its high proper motion (1.1 arcsec yr/s). We obtained an optical to near-infr…
Primeval very low-mass stars and brown dwarfs - III. The halo transitional brown dwarfs
Z. H. Zhang, D. J. Pinfield, M. C. Galvez-Ortiz +11
We report the discovery of an esdL3 subdwarf, ULAS J020858.62+020657.0, and a usdL4.5 subdwarf, ULAS J230711.01+014447.1. They were identified as L subdwarfs by optical spectra obt…
Primeval very low-mass stars and brown dwarfs - II. The most metal-poor substellar object
Z. H. Zhang, D. Homeier, D. J. Pinfield +4
SDSS J010448.46+153501.8 has previously been classified as an sdM9.5 subdwarf. However, its very blue colour () suggests a much lower metallicity compared to…
Primeval very low-mass stars and brown dwarfs. I. Six new L subdwarfs, classification and atmospheric properties
Z. H. Zhang, D. J. Pinfield, M. C. Galvez-Ortiz +10
We have conducted a search for L subdwarf candidates within the photometric catalogues of the UKIRT Infrared Deep Sky Survey and Sloan Digital Sky Survey. Six of our candidates are…
Probing M subdwarf metallicity with an esdK5+esdM5.5 binary
Ya. V. Pavlenko, Z. H. Zhang, M. C. Gálvez-Ortiz +2
We present a spectral analysis of the binary G 224-58 AB that consists of the coolest M extreme subdwarf (esdM5.5) and a brighter primary (esdK5). This binary may serve as a benchm…
Parallaxes of five L Dwarfs with a Robotic Telescope
Y. Wang, H. R. A. Jones, R. L. Smart +14
We report the parallax and proper motion of five L dwarfs obtained with observations from the robotic Liverpool Telescope. Our derived proper motions are consistent with published…
A spectroscopic and proper motion search of Sloan digital Sky Survey: red subdwarfs in binary systems
Z. H. Zhang, D. J. Pinfield, B. Burningham +13
Red subdwarfs in binary systems are crucial for both model calibration and spectral classification. We search for red subdwarfs in binary systems from a sample of high proper motio…
Two new ultra-cool benchmark systems from WISE+2MASS
J. I. Gomes, D. J. Pinfield, F. Marocco +6
We have used the 2MASS all-sky survey and the WISE to look for ultracool dwarfs that are part of multiple systems containing main sequence stars. We cross-matched L dwarf candidate…
The sub-stellar birth rate from UKIDSS
A. C. Day-Jones, F. Marocco, D. J. Pinfield +11
We present a new sample of mid L to mid T dwarfs with effective temperatures of 1100 to 1700K selected from the UKIDSS Large Area Survey and confirmed with infrared spectra from X-…
Discovery of the benchmark metal poor T8 dwarf BD+01 2920B
D. J. Pinfield, B. Burningham, N. Lodieu +20
We have searched the WISE first data release for widely separated (<10,000AU) late T dwarf companions to Hipparcos and Gliese stars. We have discovered a new binary system containi…
The properties of the T8.5p dwarf Ross 458C
Ben Burningham, S. K. Leggett, D. Homeier +12
We present near-infrared photometry and spectroscopy, and warm-Spitzer IRAC photometry of the young very cool T dwarf Ross 458C, which we have typed as T8.5p. By applying the fiduc…
The discovery of the T8.5 dwarf UGPS J0521+3640
Ben Burningham, P. W. Lucas, S. K. Leggett +15
We have carried out a search for late-type T dwarfs in the UKIDSS Galactic Plane Survey 6th Data Release. The search yielded two persuasive candidates, both of which have been conf…
Blue not brown: UKIDSS T dwarfs with suppressed K-band flux
D. N. Murray, B. Burningham, H. R. A Jones +13
We have used blue near-infrared colours to select a group of 12 spectroscopically-confirmed UKIDSS T dwarfs later than T4. From amongst these we identify the first two kinematic ha…
Modelling the radio pulses of an ultracool dwarf
S. Yu, G. Hallinan, J. G. Doyle +5
Recently unanticipated magnetic activity in ultracool dwarfs (UCDs, spectral classes later than M7) have emerged from a number of radio observations. The highly (up to 100%) circul…
Discovery of a T dwarf + white dwarf binary system
A. C. Day-Jones, D. J. Pinfield, M. T. Ruiz +11
We present the discovery of the first T dwarf + white dwarf binary system LSPM 1459+0857AB, confirmed through common proper motion and spectroscopy. The white dwarf is a high prope…
The current population of benchmark brown dwarfs
A. C. Day-Jones, D. J. Pinfield, M. T. Ruiz +7
The number of brown dwarfs (BDs) now identified tops 700. Yet our understanding of these cool objects is still lacking, and models are struggling to accurately reproduce observatio…
Ultra-cool Dwarfs from Large Area Surveys
Z. H. Zhang, H. R. A. Jones, D. J. Pinfield +2
We selected brown dwarf candidates from the seventh Data Release of the Sloan Digital Sky Survey (SDSS DR7) with new photometric selectioncriteria based on a parameteriaztion of we…