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SAFARI - I. A SPHERE discovery of a super metal-rich M-dwarf companion to the star HD 86006

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2018
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Pantoja, B.
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SAFARI - I. A SPHERE discovery of a super metal-rich M-dwarf companion to the star HD 86006
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  • Pantoja, B.;
  • Jenkins, James Stewart;
  • Girard, J.;
  • Vigan, A.;
  • Salter, G.;
  • Jones, M.;
Abstract
We report the direct detection of a fully convective, early-to-midM-dwarf companion orbiting the star HD 86006, using ESO-SPHERE during Science Verification as part of the SAFARI program. HARPS+CORALIE radial velocity measurements first indicated a possible companion. Such work highlights the synergies that are now possible between these two observing methods.We studied the companion by comparing our observed spectra with BT-Settl models and template spectra, measuring spectral indices to obtain a spectral type, and used a joint radial velocity and astrometric fit to simulate the companion's orbit. The companion was found to be 4.14 mag fainter than the primary in the H2 band, residing at a physical separation of ~25 au, with a Teff and spectral type of 3321 ± 111K and M 4.1 ± 1.1, respectively. We note that the age derived from BT-Settl models for such a star is too low by over two orders of magnitude, similar to other known field mid-M stars. We searched for the radial velocity companion to HD 90520 without any clear detection; however, we reached a low contrast level of ΔH2 = 10.3mag (or 1.3 * 10⁻⁴) at 0.2 arcsec and 12.6mag (or 10⁻⁵) at 0.5 arcsec, allowing us to rule out any low-mass companions with masses of 0.07 and 0.05M⊙ at these separations. This discovery provides us with the exciting opportunity to better constrain the mass-luminosity relation for low-mass stars in the super metal-rich domain, expanding our understanding of the most-common types of stars and substellar objects.
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URI: https://repositorio.uchile.cl/handle/2250/169377
DOI: 10.1093/mnras/sty1716
ISSN: 13652966
00358711
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Monthly Notices of the Royal Astronomical Society, Volumen 479, Issue 4, 2018, Pages 4958-4970
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