Individual dynamical masses of DENIS J063001.4−184014AB reveal a likely young brown dwarf triple

J Sahlmann, T J Dupuy, A J Burgasser, J C Filippazzo, E L Martín, D C Bardalez Gagliuffi, C Hsu, P F Lazorenko, Michael C. Liu

Research output: Contribution to journalArticlepeer-review


The binary nature of the M8.5 dwarf DENIS J063001.4−184014AB (DE0630−18) was discovered with astrometric monitoring from the ground, which determined the unresolved photocentric orbit and the trigonometric parallax of the system. Here we present radial velocity monitoring and resolved observations in the near-infrared with Keck aperture masking that allows us to measure the system’s relative separation and brightness. By combining all available information, we determine the individual dynamical masses of the binary components to be M1=0.052+0.009−0.008MSun and M2=0.052+0.005−0.004MSun, both firmly in the substellar regime. These masses are surprising, given the object’s M8.5 optical spectral type and equivalent absolute magnitude, and the significant difference in brightness between the components (ΔK = 1.74 ± 0.06 mag). Our results suggest that DE0630−18 is a relatively young system (∼200 Myr) with a secondary component that is itself a potentially unresolved binary.
Original languageEnglish
Pages (from-to)5453-5461
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date18 Nov 2020
Publication statusPublished - 1 Feb 2021


  • astro-ph.SR


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