Posters from the 2023 STScI Spring Symposium
Published May 11, 2023 | Version v1
Poster Open

Two new benchmark brown dwarfs with precise dynamical masses

Authors/Creators

  • 1. ESA/STScI
  • 2. Universite de Geneve
  • 3. MPIA
  • 4. UT Austin
  • 5. IPAG

Description

We report the discovery of HD 112863 B and HD 206505 B, which are two new benchmark brown dwarfs that sit at the substellar-stellar boundary with precise dynamical masses. We perform an orbital fit combining the radial velocities from the CORALIE survey, with relative astrometry from direct imaging with VLT/SPHERE, as well as absolute astrometry from HIPPARCOS and Gaia eDR3, which yields dynamical masses for HD 112863 B and HD 206505B to be 82.1 ± 2.8 MJup and 79.8 ± 1.8 MJup respectively. From the H and K band photometry from IRDIS data taken with VLT/SPHERE, we determine the spectral types of both HD 112863 B and HD 206505 B to be early-mid L-types.

Files

STScI_Symposium_2023.pdf

Files (22.0 MB)

Name Size Download all
md5:415804c5accd98993b743f2547369faf
22.0 MB Preview Download