An L0 dwarf companion in the brown dwarf desert, at 30 AU

Bibcode
2004A&A...427L...1F
DOI
10.1051/0004-6361:200400069
Forveille, T.; Ségransan, D.; Delorme, P.; Martín, E. L.; Delfosse, X.; Acosta-Pulido, J. A.; Beuzit, J.-L.; Manchado, A.; Mayor, M.; Perrier, C.; Udry, S.
Referencia bibliográfica

Astronomy and Astrophysics, v.427, p.L1-L4 (2004)

Fecha de publicación:
11
2004
Revista
Astronomy and Astrophysics
Número de autores
11
Número de autores del IAC
3
Número de citas
23
Número de citas referidas
21
Descripción
We present the discovery of an L0 companion to the nearby M1.5 dwarf G 239-25, at a projected distance of 31 AU. It is the faintest companion discovered so far in our adaptive optics survey of all known M dwarfs within 12 pc, and it lies at the stellar/substellar limit. Given the assumed age of the primary star, the companion is likely an extremely low mass star. The long orbital period of G 239-25 AB (≈100 years) precludes a direct mass determination, but the relatively wide angular separation will allow detailed analyses of its near infrared and visible spectra. Based on observations made at Canada-France-Hawaii Telescope, operated by the National Council of Canada, the Centre National de la Recherche Scientifique de France and the University of Hawaii, at the Observatoire de Haute Provence, operated by the Centre National de la Recherche Scientifique de France and at the William Herschel Telescopes operated by the Isaac Newton Group at the Instituto de Astrofísica de Canarias.
Tipo
Con árbitro
Estrellas binarias

Te puede interesar

  • Con árbitro
    The variability patterns of the TeV blazar PG 1553 + 113 from a decade of MAGIC and multiband observations

    PG 1553 + 113 is one of the few blazars with a convincing quasi-periodic emission in the gamma-ray band. The source is also a very high energy (VHE; >100 GeV) gamma-ray emitter. To better understand its properties and identify the underlying physical processes driving its variability, the MAGIC Collaboration initiated a multiyear, multiwavelength

    Abe, H. et al.

    Fecha de publicación:

    4
    2024
    Bibcode
    2024MNRAS.529.3894A
    Número de citas
    0
  • Con árbitro
    First characterization of the emission behavior of Mrk 421 from radio to very high-energy gamma rays with simultaneous X-ray polarization measurements

    Aims: We have performed the first broadband study of Mrk 421 from radio to TeV gamma rays with simultaneous measurements of the X-ray polarization from IXPE. Methods: The data were collected as part of an extensive multiwavelength campaign carried out between May and June 2022 using MAGIC, Fermi-LAT, NuSTAR, XMM-Newton, Swift, and several optical

    Abe, S. et al.

    Fecha de publicación:

    4
    2024
    Bibcode
    2024A&A...684A.127A
    Número de citas
    0
  • Con árbitro
    Effects of density and temperature variations on the metallicity of Mrk 71

    In a very recent work, [1] claim that the scenario of temperature inhomogeneities proposed by [2] ($t2$ > 0) is not able to explain the O$^{2+}$/H$^{+}$ abundance discrepancy observed between the calculations based on the optical [OIII] collisional excited lines (CELs) and the OII recombination lines (RLs) in the star forming galaxy Mrk71. In this

    Méndez-Delgado, J. Eduardo et al.

    Fecha de publicación:

    3
    2024
    Bibcode
    2024NatAs...8..275M
    Número de citas
    2