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28 March 2024
 
  » arxiv » 1101.2893

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The Gemini NICI Planet-Finding Campaign : Discovery of a Substellar L Dwarf Companion to the Nearby Young M Dwarf CD-35 2722
Zahed Wahhaj ; Michael C. Liu ; Beth A. Biller ; Fraser Clarke ; Eric L. Nielsen ; Laird M. Close ; Thomas L. Hayward ; Eric E. Mamajek ; Michael Cushing ; Trent Dupuy ; Matthias Tecza ; Niranjan Thatte ; Mark Chun ; Christ Ftaclas ; Markus Hartung ; I. Neill Reid ; Evgenya L. Shkolnik ; Silvia H. P. Alencar ; Pawel Artymowicz ; Alan Boss ; Elisabethe de Gouveia Dal Pino ; Jane Gregorio-Hetem ; Shigeru Ida ; Marc Kuchner ; Douglas N. C. Lin ; Douglas W. Toomey ;
Date 14 Jan 2011
AbstractWe present the discovery of a wide (67 AU) substellar companion to the nearby (21 pc) young solar-metallicity M1 dwarf CD-35 2722, a member of the ~100 Myr AB Doradus association. Two epochs of astrometry from the NICI Planet-Finding Campaign confirm that CD-35 2722 B is physically associated with the primary star. Near-IR spectra indicate a spectral type of L4pm1 with a moderately low surface gravity, making it one of the coolest young companions found to date. The absorption lines and near-IR continuum shape of CD-35 2722 B agree especially well the dusty field L4.5 dwarf 2MASS J22244381-0158521, while the near-IR colors and absolute magnitudes match those of the 5 Myr old L4 planetary-mass companion, 1RXS J160929.1-210524 b. Overall, CD-35 2722 B appears to be an intermediate-age benchmark for L-dwarfs, with a less peaked H-band continuum than the youngest objects and near-IR absorption lines comparable to field objects. We fit Ames-Dusty model atmospheres to the near-IR spectra and find T=1700-1900 K and log(g) =4.5pm0.5. The spectra also show that the radial velocities of components A and B agree to within pm10 km/s, further confirming their physical association. Using the age and bolometric luminosity of CD-35 2722 B, we derive a mass of 31pm8 Mjup from the Lyon/Dusty evolutionary models. Altogether, young late-M to mid-L type companions appear to be over-luminous for their near-IR spectral type compared to field objects, in contrast to the under-luminosity of young late-L and early-T dwarfs.
Source arXiv, 1101.2893
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