Two new ultracool benchmark systems from WISE+2MASS

Bibcode
2013MNRAS.431.2745G
DOI
10.1093/mnras/stt371
Gomes, J. I.; Pinfield, D. J.; Marocco, F.; Day-Jones, A. C.; Burningham, B.; Zhang, Z. H.; Jones, H. R. A.; Spaandonk, L. van; Weights, D.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 431, Issue 3, p.2745-2755

Advertised on:
5
2013
Journal
Monthly Notices of the Royal Astronomical Society
Number of authors
9
IAC number of authors
0
Citations
32
Refereed citations
28
Description
We have used the Two-Micron All-Sky Survey and the Wide-field Infrared Survey Explorer to look for ultracool dwarfs that are part of multiple systems containing main-sequence stars. We cross-matched L dwarf candidates from the surveys with Hipparcos and Gliese stars, finding two new systems. The first system, G255-34AB, is an L2 dwarf companion to a K8 star, at a distance of 36 pc. We estimate its bolometric luminosity as log L/L⊙ = -3.78 ± 0.045 and Teff = 2080 ± 260 K. The second system, GJ499ABC, is a triple, with an L5 dwarf as a companion to a binary with an M4 and K5 star. These two new systems bring the number of L dwarf plus main-sequence star multiple systems to 24, which we discuss. We consider the binary fraction for L dwarfs and main-sequence stars, and further assess possible unresolved multiplicity within the full companion sample. This analysis shows that some of the L dwarfs in this sample might actually be unresolved binaries themselves, since their MJ appears to be brighter than the expected for their spectral types.
Type
Refereed
Surveys

It may interest you

  • Refereed
    Calibrating the Clock of JWST
    JWST, despite not being designed to observe astrophysical phenomena that vary on rapid timescales, can be an unparalleled tool for such studies. If timing systematics can be controlled, JWST will be able to open up the subsecond infrared timescale regime. Rapid time-domain studies, such as lag measurements in accreting compact objects and solar
    Dhillon, V. S. et al.

    Advertised on:

    1
    2025
    Bibcode
    2025AJ....169...21S
    Citations
    0
  • Refereed
    Comparing metallicity correlations in nearby non-AGN and AGN-host galaxies
    The gas-phase metallicity distribution within galaxies records critical information about galactic evolution. In this work, we investigate how active galactic nuclei (AGNs) influence this distribution by measuring the two-point correlation functions of gas-phase metallicity in 95 non-AGN and 37 AGN-host galaxies from the Calar Alto Legacy Integral
    Li, Song-Lin et al.

    Advertised on:

    1
    2025
    Bibcode
    2025MNRAS.536..430L
    Citations
    1
  • Refereed
    Why do some ultra diffuse Galaxies have rich globular cluster systems?
    Some ultra diffuse galaxies (UDGs) reveal many more globular clusters (GCs) than classical dwarf galaxies of the same stellar mass. These UDGs, with a mass in their GC system ( $M_{\rm GC}$) approaching 10 per cent of their host galaxy stellar mass ( $M_{\ast }$), are also inferred to have high halo mass to stellar mass ratios ( $M_{\rm halo}/M_{
    Forbes, Duncan A. et al.

    Advertised on:

    1
    2025
    Bibcode
    2025MNRAS.536.1217F
    Citations
    0