Spectroscopy of Hyades L dwarf candidates

Abstract

We present the results of photometric, astrometric, and spectroscopic follow-up of L dwarf candidates identified in the Hyades cluster by Hogan et al. (2008). We obtained low-resolution optical spectroscopy with the OSIRIS spectrograph on the Gran Telescopio de Canarias for all 12 L dwarf candidates as well as new J-band imaging for a subsample of eight to confirm their proper motion. We also present mid-infrared photometry from the Wise Field Infrared Survey Explorer (WISE) for the Hyades L and T dwarf candidates and estimate their spectroscopic distances, effective temperatures, and masses. We confirm the cool nature of several L dwarf candidates and confirm astrometrically their membership, bridging the gap between the coolest M dwarfs and the two T dwarfs previously reported in the Hyades cluster. These members represent valuable spectral templates at an age of 625 Myr and slightly super solar metallicity (Fe/H=+0.13). We update the Hyades mass function across the hydrogen-burning limit and in the substellar regime. We confirm a small number numbers of very-low-mass members below ~0.1 Msun belonging to the Hyades cluster.

12 pages, 7 figures, 3 tables; accepted for publication in MNRAS

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• A Search for L/T Transition Dwarfs With Pan-STARRS1 and WISE. II. L/T Transition Atmospheres and Young Discoveries
• A 3D view of the Hyades stellar and sub-stellar population
• The First Science Results from SPHERE: Disproving the Predicted Brown Dwarf around V471 Tau
• The Mass-Luminosity Relation in the L/T Transition: Individual Dynamical Masses for the New J-Band Flux Reversal Binary SDSSJ105213.51+442255.7AB
• A Brown Dwarf Census from the SIMP Survey
• Lithium depletion boundary, stellar associations, and Gaia
• Results from The COPAINS Pilot Survey: four new brown dwarfs and a high companion detection rate for accelerating stars
• The Factory and the Beehive. IV. A Comprehensive Study of the Rotation X-ray Activity Relation in Praesepe and the Hyades
• A new L5 brown dwarf member of the Hyades cluster with chromospheric activity
• Spectral analysis of two directly imaged benchmark L dwarf companions at the stellar-substellar boundary
• Substellar Hyades Candidates from the UKIRT Hemisphere Survey
• Two close binaries across the hydrogen-burning limit in the Praesepe open cluster
• 4MOST ChANGES: Catalog of high-redshift quasar candidates (4.5 < $z$ < 7) selected with SED fitting