Explanipedia

Benchmark brown dwarfs – I. A blue M2 + T5 wide binary and a probable young [M4 + M4] + [T7 + T8] hierarchical quadruple Open

Z. H. Zhang, Felipe Navarete, M. C. Gálvez-Ortiz, H. R. A. Jones, Adam J. Burgasser , et al. · 2025

Benchmark brown dwarfs in wide binary systems are crucial for characterizing substellar objects and calibrating atmospheric and evolutionary models. However, brown dwarf benchmarks with subsolar metallicity, very cool temperatures, or suit…

The Gaia ultracool dwarf sample – VI. Spectral types and properties of 51 ultracool dwarfs Open

Gemma Cheng, H. R. A. Jones, R. L. Smart, Federico Marocco, William Cooper , et al. · 2025

Near-infrared spectra from the IRTF/SpeX and Blanco/ARCoIRIS telescope/instrument combinations are used for spectroscopic classification, to measure radial velocities, and for the inference of astrophysical properties of 51 Gaia-selected n…

The Gaia Ultracool Dwarf Sample -- VI. Spectral Types and Properties of 51 Ultracool Dwarfs Open

Gemma Cheng, H. R. A. Jones, R. L. Smart, Federico Marocco, W. J. Cooper , et al. · 2025

Near-infrared spectra from the IRTF/SpeX and Blanco/ARCoIRIS telescope/instrument combinations are used for spectroscopic classification, to measure radial velocities and for the inference of astrophysical properties of 51 Gaia-selected ne…

The Gaia ultracool dwarf sample–IV. GTC/OSIRIS optical spectra of Gaia late-M and L dwarfs Open

William Cooper, H. R. A. Jones, R. L. Smart, S. L. Folkes, J. A. Caballero , et al. · 2024

As part of our comprehensive, ongoing characterization of the low-mass end of the main sequence in the Solar neighbourhood, we used the OSIRIS instrument at the 10.4 m Gran Telescopio Canarias to acquire low- and mid-resolution (R${\approx…

The Gaia ultracool dwarf sample – V: the ultracool dwarf companion catalogue Open

Sayan Baig, R. L. Smart, H. R. A. Jones, Jonathan Gagné, D. J. Pinfield , et al. · 2024

We present the Ultracool Dwarf Companion Catalogue of 278 multiple systems, 32 of which are newly discovered, each with at least one spectroscopically confirmed Ultracool Dwarf, within a 100 pc volume-limited sample. This catalogue is comp…

The Gaia Ultracool Dwarf Sample -- V: The Ultracool Dwarf Companion catalogue Open

Sayan Baig, R. L. Smart, H. R. A. Jones, Jonathan Gagné, D. J. Pinfield , et al. · 2024

We present the Ultracool Dwarf Companion Catalogue of 278 multiple systems, 32 of which are newly discovered, each with at least one spectroscopically confirmed Ultracool Dwarf, within a 100 pc volume-limited sample. This catalogue is comp…

Primeval very low-mass stars and brown dwarfs – VIII. The first age benchmark L subdwarf, a wide companion to a halo white dwarf Open

Z. H. Zhang, R. Raddi, Adam J. Burgasser, S. L. Casewell, R. L. Smart , et al. · 2024

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 include a white dwarf + L subdwarf binary, VVV 1256−62AB, a gravi…

PROPERTIES OF THE COOLEST DWARFS Open

S. K. Leggett, Richard Freedman, T. R. Geballe, D. A. Golimowski, N. Lodieu , et al. · 2024

Eleven years after the discovery of the first T dwarf, we have a population of ultracool L and T dwarfs that is large enough to show a range of atmospheric properties, as well as model atmospheres advanced enough to study these properties …

Mid-infrared followup of cold brown dwarfs: diversity in age, mass and metallicity Open

D. Saumon, S. K. Leggett, Ben Burningham, Mark S. Marley, S J Waren , et al. · 2024

We present new Spitzer IRAC [3.6], [4.5], [5.8] and [8.0] photometry of nine very late-type T dwarfs. Combining this with previously published photometry, we investigate trends with type and color that are useful for both the planning and …

The 600K T9 dwarfs: analysis of the spectral energy distributions Open

D. Saumon, S. K. Leggett, Ben Burningham, Michael C. Cushing, Mark S. Marley , et al. · 2024

We present 8--15 {mu}m spectra of ULAS J003402.77-005206.7, and extremely late-type T dwarf. We fit synthetic spectra to the near- through mid-infrared energy distribution of this dwarf, as well as to the near-infrared spectra of two simil…

76 T dwarfs from the UKIDSS LAS: Benchmarks, kinematics and an updated space density Open

Ben Burningham, Chasnini Cardoso, Leigh C. Smith, S. K. Leggett, R. L. Smart , et al. · 2023

We report the discovery of 76 new T dwarfs from the UKIRT Infrared Deep Sky Survey(UKIDSS) Large Area Survey (LAS). Near-infrared broad-and narrow-band photometry and spectroscopy are presented for the new objects, along withWide-field Inf…

A blue depression in the optical spectra of M dwarfs Open

H. R. A. Jones, Ya. V. Pavlenko, Y. Lyubchik, M. S. Bessell, N. F. Allard , et al. · 2023

A blue depression is found in the spectra of M dwarfs from 4000 to 4500 Å. This depression shows an increase towards lower temperatures, though it is particularly sensitive to gravity and metallicity. It is the single strongest and most se…

A blue depression in the optical spectra of M dwarfs Open

H. R. A. Jones, Ya. V. Pavlenko, Y. Lyubchik, M. S. Bessell, N. F. Allard , et al. · 2023

A blue depression is found in the spectra of M dwarfs from 4000 to 4500A. This depression shows an increase toward lower temperatures though is particularly sensitive to gravity and metallicity. It is the single most sensitive feature in t…

Identifying and characterizing ultracool dwarfs ejected from post-encounter disintegrating systems Open

A. K. P. Yip, R. Kurtev, D. J. Pinfield, Federico Marocco, M. Gromadzki , et al. · 2023

Disintegrating multiple systems have been previously discovered from kinematic studies of the Hipparcos catalogue. They are presumably the result of dynamical encounters taking place in the Galactic disc between single/multiple systems. In…

Identifying and characterizing ultracool dwarfs ejected from post-encounter disintegrating systems Open

Alexandra K. P. Yip, R. Kurtev, D. J. Pinfield, Federico Marocco, M. Gromadzki , et al. · 2023

Disintegrating multiple systems have been previously discovered from kinematic studies of the $\it Hipparcos$ catalogue. They are presumably the result of dynamical encounters taking place in the Galactic disk between single/multiple syste…

GTC/CanariCam Deep Mid-infrared Imaging Survey of Northern Stars within 5 pc Open

B. Gauza, V. J. S. Béjar, R. Rébolo, C. Álvarez, M. R. Zapatero Osorio , et al. · 2021

In this work we present the results of a direct imaging survey for brown dwarf companions around the nearest stars at the mid-infrared 10 micron range ( λ c = 8.7 μ m, Δ λ = 1.1 μ m) using the CanariCam instrument on the 10.4 m Gran Telesc…

Serendipitous discovery of a dusty disc around WDJ181417.84−735459.83 Open

Elena González Egea, R. Raddi, D. Koester, Laura K. Rogers, Federico Marocco , et al. · 2020

Spectroscopic observations of white dwarfs reveal that many of them are polluted by exoplanetary material, whose bulk composition can be uniquely probed this way. We present a spectroscopic and photometric analysis of the DA white dwarf WD…

Reduced spectroscopy objects WDJ181417.84-735459.83 and VHS 472908521370 Open

Elena González Egea, R. Raddi, D. Koester, Laura K. Rogers, Federico Marocco , et al. · 2020

Files Spec_WD1814-2011-LKR_XSHOOTER.txt, WDex_SCI_SLIT_FLUX_MERGE1D_UVB.fits and WDex_SCI_SLIT_FLUX_MERGE1D_VIS.fits are the .txt and .fits versions of the reduced X-SHOOTER spectrum of object WDJ181417.84-735459.83, observed under Europea…

Reduced spectroscopy objects WDJ181417.84-735459.83 and VHS 472908521370 Open

Elena González Egea, R. Raddi, D. Koester, Laura K. Rogers, Federico Marocco , et al. · 2020

Files Spec_WD1814-2011-LKR_XSHOOTER.txt, WDex_SCI_SLIT_FLUX_MERGE1D_UVB.fits and WDex_SCI_SLIT_FLUX_MERGE1D_VIS.fits are the .txt and .fits versions of the reduced X-SHOOTER spectrum of object WDJ181417.84-735459.83, observed under Europea…

Reduced spectroscopy objects WDJ181417.84-735459.83 and VHS 472908521370 Open

Elena González Egea, R. Raddi, D. Koester, Laura K. Rogers, Federico Marocco , et al. · 2020

File Spec_WD1814-2011-LKR_XSHOOTER.txt is the reduced X-SHOOTER spectrum of object WDJ181417.84-735459.83, observed under European Southern Observatory ESO programme 087.C$-$0639(B) in 2011, with PI Dr Avril Day-Jones. File Spec_WD1814-201…

Erratum: The first planet detected in the WTS: an inflated hot-Jupiter in a 3.35 day orbit around a late F-star Open

M. Cappetta, R. P. Saglia, Jayne Birkby, J. Koppenhoefer, D. J. Pinfield , et al. · 2020

With funding from the Spanish government through the "María de Maeztu Unit of Excellence" accreditation (MDM-2017-0737)

The Gaia Ultra-Cool Dwarf Sample – III: seven new multiple systems containing at least one Gaia DR2 ultracool dwarf. Open

Federico Marocco, R. L. Smart, Eric E. Mamajek, L. M. Sarro, Adam J. Burgasser , et al. · 2020

We present 10 new ultracool dwarfs in seven wide binary systems discovered using Gaia second data release data, identified as part of our Gaia Ultra-Cool Dwarf Sample project. The seven systems presented here include an L1 companion to the…

Primeval very low-mass stars and brown dwarfs – VI. Population properties of metal-poor degenerate brown dwarfs Open

Z. H. Zhang, Adam J. Burgasser, M. C. Gálvez-Ortiz, N. Lodieu, M. R. Zapatero Osorio , et al. · 2019

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 surveys, and confirmed with optical to near-infrared spectra…

Parallaxes of Southern Extremely Cool objects III: 118 L and T dwarfs Open

R. L. Smart, B. Bucciarelli, H. R. A. Jones, Federico Marocco, A. H. Andrei , et al. · 2018

We present new results from the Parallaxes of Southern Extremely Cool dwarfs program to measure parallaxes, proper motions and multiepoch photometry of L and early T dwarfs. The observations were made on 108 nights over the course of 8 yr …

A chemical survey of exoplanets with ARIEL Open

G. Tinetti, P. Drossart, Paul Eccleston, P. Hartogh, A. Heske , et al. · 2018

Primeval very low-mass stars and brown dwarfs – IV. New L subdwarfs, Gaia astrometry, population properties, and a blue brown dwarf binary Open

Z. H. Zhang, M. C. Gálvez-Ortiz, D. J. Pinfield, Adam J. Burgasser, N. Lodieu , et al. · 2018

We present 27 new L subdwarfs and classify five of them as esdL and 22 as\nsdL. Our L subdwarf candidates were selected with the UKIRT Infrared Deep Sky\nSurvey and Sloan Digital Sky Survey. Spectroscopic follow-up was carried out\nprimari…

M Dwarf Planetary Systems: An Observational Study To Look For Prolonged Activity In Host Stars Open

Elena González Egea, D. J. Pinfield, Federico Marocco, R. Raddi, Neil J. Cook , et al. · 2018

M dwarf stars begin their lives rapidly rotating and with high levels of activity, but as time goes on, they slow down via magnetically channelled winds, whilst their activity decreases. We aim to investigate the possibility of prolonged r…

Primeval very low-mass stars and brown dwarfs – III. The halo transitional brown dwarfs Open

Z. H. Zhang, D. J. Pinfield, M. C. Gálvez-Ortiz, D. Homeier, Adam J. Burgasser , et al. · 2018

We report the discovery of an esdL3 subdwarf, ULAS J020858.62+020657.0, and a\nusdL4.5 subdwarf, ULAS J230711.01+014447.1. They were identified as L subdwarfs\nby optical spectra obtained with the Gran Telescopio Canarias, and followed up\…

VIRAC: the VVV Infrared Astrometric Catalogue Open

Leigh C. Smith, P. W. Lucas, R. Kurtev, R. L. Smart, D. Minniti , et al. · 2017

© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licens…

Ultracool dwarf benchmarks with Gaia primaries Open

Federico Marocco, D. J. Pinfield, Neil J. Cook, M. R. Zapatero Osorio, D. Montes , et al. · 2017

We explore the potential of Gaia for the field of benchmark ultracool/brown dwarf companions, and present the results of an initial search for metal-rich/metal-poor systems. A simulated population of resolved ultracool dwarf companions to …

D. J. Pinfield YOU? Author Swipe