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Online Spectroscopic Library of Young Brown Dwarfs

At young ages, low surface gravity affects the atmospheric properties of ultracool dwarfs. The impact on medium-resolution near-infrared (NIR) spectra has only been slightly investigated at the M-L transition sofar. We present below a library of near-infrared (1.1–2.45 μm) medium-resolution (R∼1500-2000) integral field spectra of 15 young M6-L0 dwarfs. We aim at deriving updated NIR spectral type, luminosity and physical parameters (Teff , log g , M, L/L ) of each source. This work also aims at testing the latest generation of BT-SETTL atmospheric models.
  • SINFlib_Bonnefoy_v4.pdf, A&A Article, Bonnefoy, Chauvin, et al. 2013, A&A, submitted
  • online_library_Bonnefoy13.tar.gz , Library of near-infrared spectra of young dwarfs at the M-L transitionLibrary of near-infrared spectra of young dwarfs at the M-L transition

    VLT/ERIS, 3rd generation instrument

    The Enhanced Resolution Imager and Spectrograph (ERIS) is the next-generation instrument planned for the Very Large Telescope (VLT) and the Adaptive Optics Facility (AOF) 1 . It is an AO assisted instrument that will make use of the Deformable Secondary Mirror and the new Laser Guide Star Facility (4LGSF), and it is designed for the Cassegrain focus of the telescope UT4. The project just concluded its conceptual design phase and is awaiting formal approval to continue to the next phase. ERIS will offer 1-5 m imaging and 1-2.5 m integral field spectroscopic capabilities with high Strehl performance. As such it will replace, with much improved single conjugated AO correction, the most scientifically important and popular observing capabilities currently offered by NACO 2 (diffraction limited imaging in JM band, Sparse Aperture Masking and APP coronagraphy) and by SINFONI 3 , whose instrumental module, SPIFFI, will be re-used in ERIS. The Cassegrain location and the performance requirements impose challenging demands on the project, from opto-mechanical design to cryogenics to the operational concept. In this paper we describe the baseline design proposed for ERIS and discuss these technical challenges, with particular emphasis on the trade-offs and the novel solutions proposed for building ERIS.

    ESO Article