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DISCOVERY OF TWO VERY WIDE BINARIES WITH ULTRACOOL COMPANIONS AND A NEW BROWN DWARF AT THE L/T TRANSITION.
Muzic, Koraljka; Radigan, Jacqueline; Jayawardhana, Ray; Ivanov, Valentin D; Faherty, Jacqueline K; Kurtev, Radostin G; Núñez, Alejandro; Boffin, Henri M J; Hainaut, Olivier; Cruz, Kelle; Jones, David; Metchev, Stanimir; Tyndall, Amy; Borissova, Jura.
Affiliation
  • Muzic K; Department of Astronomy & Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada.
  • Radigan J; Department of Astronomy & Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada.
  • Jayawardhana R; Department of Astronomy & Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada.
  • Ivanov VD; European Southern Observatory, Alonso de Córdova 3107, Casilla 19, Santiago, 19001, Chile.
  • Faherty JK; Department of Astronomy, University of Chile, Camino El Observatorio 1515, Casilla 36-D, Santiago, Chile.
  • Kurtev RG; Dept. of Astrophysics, American Museum of Natural History, New York, NY, 10024, USA.
  • Núñez A; Departamento de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso, Av. Gran Bretaña 1111, Playa Ancha, Casilla 53, Valparaíso, Chile.
  • Boffin HMJ; Department of Physics and Astronomy, Hunter College, City University of New York, 695 Park Ave, NY 10065, USA.
  • Hainaut O; Dept. of Astrophysics, American Museum of Natural History, New York, NY, 10024, USA.
  • Cruz K; European Southern Observatory, Alonso de Córdova 3107, Casilla 19, Santiago, 19001, Chile.
  • Jones D; European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany.
  • Metchev S; Department of Physics and Astronomy, Hunter College, City University of New York, 695 Park Ave, NY 10065, USA.
  • Tyndall A; Dept. of Astrophysics, American Museum of Natural History, New York, NY, 10024, USA.
  • Borissova J; European Southern Observatory, Alonso de Córdova 3107, Casilla 19, Santiago, 19001, Chile.
Astron J ; 144(6)2012.
Article in En | MEDLINE | ID: mdl-30555171
We present the discovery and spectroscopic follow-up of a nearby late-type L dwarf (2M0614+3950), and two extremely wide very-low-mass binary systems (2M0525-7425AB and 2M1348-1344AB), resulting from our search for common proper motion pairs containing ultracool components in the Two Micron All Sky Survey (2MASS) and the Wide-field Infrared Survey Explorer (WISE) catalogs. The near-infrared spectrum of 2M0614+3950 indicates a spectral type L9 ± 1 object residing at a distance of 26.0 ± 1.8 pc. The optical spectrum of 2M0525-7425A reveals an M3.0 ± 0.5 dwarf primary, accompanied by a secondary previously classified as L2. The system has an angular separation of ~ 44″, equivalent to ~ 2000 AU at distance of 46.0 ± 3.0 pc. Using optical and infrared spectra, respectively, we classify the components of 2M1348-1344AB as M4.5 ± 0.5 and T5.5 ± 1. The angular separation of ~ 68″ is equivalent to ~ 1400 AU at a distance of 20.7 ± 1.4 pc. 2M1348-1344AB is one of only six very wide (separation > 1000 AU) systems containing late T dwarfs known to date.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Astron J Year: 2012 Document type: Article Affiliation country: Canadá Country of publication: Estados Unidos
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Astron J Year: 2012 Document type: Article Affiliation country: Canadá Country of publication: Estados Unidos