Primeval very low-mass stars and brown dwarfs. I. Six new L subdwarfs, classification and atmospheric properties
Zhenyu Zhang,Zhenyu Zhang,D. J. Pinfield,M. C. Gálvez-Ortiz,Ben Burningham,Nicolas Lodieu,Nicolas Lodieu,Federico Marocco,Adam J. Burgasser,Avril C. Day-Jones,F. Allard,Hugh R. A. Jones,Derek Homeier,J. Gomes,Richard L. Smart +14 more
TLDR
In this article, the spectral types and metallicity subclasses of known L subdwarfs were compared with the spectral properties of new L dwarfs and L dwarf standards.Abstract:
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 confirmed as L subdwarfs spectroscopically at optical and/or near infrared wavelengths. We also present new optical spectra of three previously known L subdwarfs (WISEA J001450.17-083823.4, 2MASS J00412179+3547133, ULAS J124425.75+102439.3). We examined the spectral types and metallicity subclasses classification of known L subdwarfs. We summarised the spectroscopic properties of L subdwarfs with different spectral types and subclasses. We classify these new L subdwarfs by comparing their spectra to known L subdwarfs and L dwarf standards. We estimate temperatures and metallicities of 22 late type M and L subdwarfs by comparing their spectra to BT-Settl models. We find that L subdwarfs have temperatures between 1500 K and 2700 K, which are higher than similarly-typed L dwarfs by around 100-400 K depending on different subclasses and subtypes. We constrained the metallicity ranges of subclasses of M, L and T subdwarfs. We also discussed the spectral type and absolute magnitude relationships for L and T subdwarfs.read more
Citations
More filters
Journal ArticleDOI
VIRAC: The VVV Infrared Astrometric Catalogue
Leigh C. Smith,P. W. Lucas,R. Kurtev,R. Kurtev,Richard L. Smart,Dante Minniti,Dante Minniti,J. Borissova,J. Borissova,Hugh R. A. Jones,Zhenyu Zhang,Federico Marocco,C. Contreras Peña,Mariusz Gromadzki,Michael A. Kuhn,Michael A. Kuhn,Janet E. Drew,D. J. Pinfield,Luigi R. Bedin +18 more
TL;DR: In this paper, an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
Journal ArticleDOI
The Field Substellar Mass Function Based on the Full-sky 20 pc Census of 525 L, T, and Y Dwarfs
J. Davy Kirkpatrick,Christopher R. Gelino,Jacqueline K. Faherty,Aaron M. Meisner,Dan Caselden,Adam C. Schneider,Federico Marocco,Alfred J. Cayago,Richard L. Smart,Peter R. Eisenhardt,Marc J. Kuchner,Edward L. Wright,Michael C. Cushing,Katelyn N. Allers,Daniella C. Bardalez Gagliuffi,Adam J. Burgasser,Jonathan Gagné,Sarah E. Logsdon,Emily C. Martin,James G. Ingalls,Patrick J. Lowrance,Ellianna S. Abrahams,Christian Aganze,Roman Gerasimov,Eileen C. Gonzales,Chih-Chun Hsu,Nikita Kamraj,Rocio Kiman,Jon M. Rees,Christopher A. Theissen,Kareem Ammar,Nikolaj Stevnbak Andersen,Paul Beaulieu,Guillaume Colin,Charles A. Elachi,Samuel J. Goodman,Leopold Gramaize,Leslie K. Hamlet,Justin Hong,Alexander Jonkeren,Mohammed Khalil,David W. Martin,William Pendrill,Benjamin Pumphrey,Austin Rothermich,Arttu Sainio,Andres Stenner,Christopher Tanner,Melina Thévenot,Nikita V. Voloshin,Jim Walla,Zbigniew Wedracki +51 more
TL;DR: In this article, the authors presented the final Spitzer trigonometric parallaxes for 361 L, T, and Y dwarfs and provided polynomial fits to the bulk trends.
Journal ArticleDOI
Primeval very low-mass stars and brown dwarfs -- II. The most metal-poor substellar object
Zhenyu Zhang,Zhenyu Zhang,Derek Homeier,D. J. Pinfield,Nicolas Lodieu,Nicolas Lodieu,Hugh R. A. Jones,F. Allard,Ya. V. Pavlenko +8 more
TL;DR: In this article, the authors reclassified SDSS J010448.8 as a usdL1.5 subdwarf based on a new optical and near-infrared spectrum obtained with X-shooter on the Very Large Telescope.
DISCOVERY OF AN UNUSUALLY BLUE L DWARF WITHIN 10 pc OF THE SUN
TL;DR: In this paper, the discovery of an unusually blue L5 dwarf within 10 pc of the Sun from a search of Sloan Digital Sky Survey (SDSS) spectra was reported.
Journal ArticleDOI
Radii of 88 M Subdwarfs and Updated Radius Relations for Low-metallicity M-dwarf Stars
Aurora Y. Kesseli,J. Davy Kirkpatrick,Sergio Fajardo-Acosta,Matthew T. Penny,B. Scott Gaudi,Mark Veyette,Patricia C. Boeshaar,Calen B. Henderson,Michael C. Cushing,Sebastiano Calchi-Novati,Yossi Shvartzvald,Philip S. Muirhead +11 more
TL;DR: In this article, a sample of 88 stars that span spectral classes K7 to M6 and include stars with metallicity classes from solar-metallicity dwarf stars to the lowest metallically ultra subdwarfs was used to test how metallic changes the stellar radius.
References
More filters
Journal ArticleDOI
The Two Micron All Sky Survey (2MASS)
Michael F. Skrutskie,Michael F. Skrutskie,Roc M. Cutri,R. Stiening,Martin D. Weinberg,Stephen E. Schneider,John M. Carpenter,Chas Beichman,R. Capps,T. Chester,J. Elias,John P. Huchra,James Liebert,C. Lonsdale,David G. Monet,Stephan D. Price,Patrick Seitzer,Thomas H. Jarrett,J. D. Kirkpatrick,John E. Gizis,E. Howard,T. Evans,John W. Fowler,L. Fullmer,Robert L. Hurt,R. M. Light,E. L. Kopan,K. A. Marsh,H. McCallon,R. Tam,S. D. Van Dyk,S. Wheelock +31 more
TL;DR: The Two Micron All Sky Survey (2MASS) as mentioned in this paper collected 25.4 Tbytes of raw imaging data from two dedicated 1.3 m diameter telescopes located at Mount Hopkins, Arizona and CerroTololo, Chile.
Journal ArticleDOI
The Sloan Digital Sky Survey: Technical Summary
TL;DR: The Sloan Digital Sky Survey (SDSS) as mentioned in this paper provides the data to support detailed investigations of the distribution of luminous and non-luminous matter in the Universe: a photometrically and astrometrically calibrated digital imaging survey of pi steradians above about Galactic latitude 30 degrees in five broad optical bands.
Journal ArticleDOI
The Sloan Digital Sky Survey: Technical summary
Donald G. York,Jennifer Adelman,John E. Anderson,Scott F. Anderson,James Annis,Neta A. Bahcall,J. A. Bakken,Robert H. Barkhouser,Steven Bastian,E. Berman,William N. Boroski,Steve Bracker,Charlie Briegel,John W. Briggs,Jon Brinkmann,Robert J. Brunner,Scott Burles,Larry N. Carey,Michael A. Carr,Francisco J. Castander,Francisco J. Castander,Bing Chen,Patrick L. Colestock,Andrew J. Connolly,James H. Crocker,István Csabai,István Csabai,Paul C. Czarapata,John Eric Davis,Mamoru Doi,Tom Dombeck,Daniel J. Eisenstein,Nancy Ellman,Brian R. Elms,Brian R. Elms,Michael L. Evans,Xiaohui Fan,Glenn R. Federwitz,Larry Fiscelli,Scott D. Friedman,Joshua A. Frieman,Joshua A. Frieman,Masataka Fukugita,Bruce Gillespie,James E. Gunn,Vijay K. Gurbani,Ernst De Haas,M. Haldeman,Frederick H. Harris,Jeffrey J. E. Hayes,Timothy M. Heckman,Gregory S. Hennessy,Robert B. Hindsley,S. Holm,Donald J. Holmgren,Chi Hao Huang,Charles L. Hull,Don Husby,Shin-Ichi Ichikawa,Takashi Ichikawa,Zěljko Ivezić,Stephen M. Kent,Rita S. J. Kim,E. Kinney,Mark A. Klaene,A. N. Kleinman,Scot Kleinman,Gillian R. Knapp,John Korienek,Richard G. Kron,Richard G. Kron,Peter Z. Kunszt,D. Q. Lamb,Brian C. Lee,R. French Leger,Siriluk Limmongkol,Carl Lindenmeyer,Dan Long,Craig Loomis,Jon Loveday,Rich Lucinio,Robert H. Lupton,Bryan Mackinnon,Bryan Mackinnon,Edward J. Mannery,Paul M. Mantsch,Bruce Margon,Peregrine M. McGehee,Timothy A. McKay,Avery Meiksin,Aronne Merelli,David G. Monet,Jeffrey A. Munn,Vijay K. Narayanan,Thomas Nash,Eric H. Neilsen,Rich Neswold,Heidi Jo Newberg,Heidi Jo Newberg,Robert C. Nichol,T. Nicinski,T. Nicinski,Mario Nonino,Norio Okada,Sadanori Okamura,Jeremiah P. Ostriker,Russell Owen,A. George Pauls,John Peoples,R. Peterson,Don Petravick,Jeffrey R. Pier,Adrian Pope,Ruth Pordes,Angela Prosapio,R. Rechenmacher,Thomas R. Quinn,Gordon T. Richards,Michael Richmond,Claudio H. Rivetta,Constance M. Rockosi,Kurt Ruthmansdorfer,Dale Sandford,David J. Schlegel,Donald P. Schneider,Maki Sekiguchi,G. Sergey,Kazuhiro Shimasaku,Walter A. Siegmund,Stephen A. Smee,J. Allyn Smith,S. A. Snedden,Robert Stone,Chris Stoughton,Michael A. Strauss,Christopher W. Stubbs,Mark SubbaRao,Alexander S. Szalay,István Szapudi,Gyula P. Szokoly,Anirudda R. Thakar,Christy Tremonti,Douglas L. Tucker,Alan Uomoto,Daniel E. Vanden Berk,Michael S. Vogeley,Patrick Waddell,Shu I. Wang,Masaru Watanabe,David H. Weinberg,Brian Yanny,Naoki Yasuda +151 more
TL;DR: The Sloan Digital Sky Survey (SDSS) as discussed by the authors provides the data to support detailed investigations of the distribution of luminous and non-luminous matter in the universe: a photometrically and astrometrically calibrated digital imaging survey of π sr above about Galactic latitude 30° in five broad optical bands to a depth of g' ~ 23 mag.
Journal ArticleDOI
The wide-field infrared survey explorer (wise): mission description and initial on-orbit performance
Edward L. Wright,Peter Eisenhardt,Amy Mainzer,Michael E. Ressler,Roc M. Cutri,Thomas H. Jarrett,J. Davy Kirkpatrick,Deborah L. Padgett,Robert S. McMillan,Michael F. Skrutskie,Spencer A. Stanford,Spencer A. Stanford,Martin Cohen,Russell G. Walker,John C. Mather,David Leisawitz,Thomas N. Gautier,Ian S. McLean,Dominic J. Benford,Carol J. Lonsdale,Andrew Blain,B. Mendez,William R. Irace,Valerie G. Duval,Fengchuan Liu,Don Royer,I. Heinrichsen,Joan Howard,Mark A. Shannon,Martha Kendall,Amy L. Walsh,Mark F. Larsen,Joel Cardon,Scott Schick,Mark Schwalm,Mohamed Abid,Beth Fabinsky,Larry Naes,Chao-Wei Tsai +38 more
TL;DR: The Wide-field Infrared Survey Explorer (WISE) is mapping the whole sky following its launch on 14 December 2009 and completed its first full coverage of the sky on July 17 as discussed by the authors.
Journal ArticleDOI
The UKIRT Infrared Deep Sky Survey (UKIDSS)
Andy Lawrence,Stephen J. Warren,Omar Almaini,Alastair C. Edge,Nigel Hambly,Richard F. Jameson,Philip W. Lucas,M. Casali,Andrew J. Adamson,Simon Dye,J. P. Emerson,S. Foucaud,P. C. Hewett,Paul Hirst,Simon Hodgkin,Mike Irwin,N. Lodieu,Richard G. McMahon,Chris Simpson,Chris Simpson,Ian Smail,Daniel J. Mortlock,M. Folger +22 more
TL;DR: The final version published in MNRAS August 2007 included significant revisions including significant revisions to the original version April 2006.
Related Papers (5)
The UKIRT Infrared Deep Sky Survey (UKIDSS)
Andy Lawrence,Stephen J. Warren,Omar Almaini,Alastair C. Edge,Nigel Hambly,Richard F. Jameson,Philip W. Lucas,M. Casali,Andrew J. Adamson,Simon Dye,J. P. Emerson,S. Foucaud,P. C. Hewett,Paul Hirst,Simon Hodgkin,Mike Irwin,N. Lodieu,Richard G. McMahon,Chris Simpson,Chris Simpson,Ian Smail,Daniel J. Mortlock,M. Folger +22 more
The wide-field infrared survey explorer (wise): mission description and initial on-orbit performance
Edward L. Wright,Peter Eisenhardt,Amy Mainzer,Michael E. Ressler,Roc M. Cutri,Thomas H. Jarrett,J. Davy Kirkpatrick,Deborah L. Padgett,Robert S. McMillan,Michael F. Skrutskie,Spencer A. Stanford,Spencer A. Stanford,Martin Cohen,Russell G. Walker,John C. Mather,David Leisawitz,Thomas N. Gautier,Ian S. McLean,Dominic J. Benford,Carol J. Lonsdale,Andrew Blain,B. Mendez,William R. Irace,Valerie G. Duval,Fengchuan Liu,Don Royer,I. Heinrichsen,Joan Howard,Mark A. Shannon,Martha Kendall,Amy L. Walsh,Mark F. Larsen,Joel Cardon,Scott Schick,Mark Schwalm,Mohamed Abid,Beth Fabinsky,Larry Naes,Chao-Wei Tsai +38 more
The Two Micron All Sky Survey (2MASS)
Michael F. Skrutskie,Michael F. Skrutskie,Roc M. Cutri,R. Stiening,Martin D. Weinberg,Stephen E. Schneider,John M. Carpenter,Chas Beichman,R. Capps,T. Chester,J. Elias,John P. Huchra,James Liebert,C. Lonsdale,David G. Monet,Stephan D. Price,Patrick Seitzer,Thomas H. Jarrett,J. D. Kirkpatrick,John E. Gizis,E. Howard,T. Evans,John W. Fowler,L. Fullmer,Robert L. Hurt,R. M. Light,E. L. Kopan,K. A. Marsh,H. McCallon,R. Tam,S. D. Van Dyk,S. Wheelock +31 more