Publication Abstracts

Tremblin et al. 2017

Tremblin, P., G. Chabrier, I. Baraffe, M.C. Liu, E.A. Magnier, P.-O. Lagage, C. Alves de Oliveira, A.K. Burgasser, D.S. Amundsen, and B. Drummond, 2017: Cloudless atmospheres for young low-gravity substellar objects. Astrophys. J., 850, 46, doi:10.3847/1538-4357/aa9214.

Atmospheric modeling of low-gravity (VL-G) young brown dwarfs remains a challenge. The presence of very thick clouds has been suggested because of their extremely red near-infrared (NIR) spectra, but no cloud mod- els provide a good fit to the data with a radius compatible with evolutionary models for these objects. We show that cloudless atmospheres assuming a temperature gradient reduction caused by fingering convection provides a very good model to match the observed VL-G NIR spectra. The sequence of extremely red col- ors in the NIR for atmospheres with effective temperature from ∼2000 K down to ∼1200 K is very well reproduced with predicted radii typical of young low-gravity objects. Future observations with NIRSPEC and MIRI on the James Webb Space Telescope (JWST) will provide more constrains in the mid-infrared, helping to confirm/refute whether or not the NIR reddening is caused by fingering convection. We suggest that the presence/absence of clouds will be directly determined by the silicate absorption features that can be observed with MIRI. JWST will therefore be able to better characterize the atmosphere of these hot young brown dwarfs and their low-gravity exoplanet analogues.

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BibTeX Citation

  author={Tremblin, P. and Chabrier, G. and Baraffe, I. and Liu, M. C. and Magnier, E. A. and Lagage, P.-O. and Alves de Oliveira, C. and Burgasser, A. K. and Amundsen, D. S. and Drummond, B.},
  title={Cloudless atmospheres for young low-gravity substellar objects},
  journal={Astrophysical Journal},

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RIS Citation

ID  - tr08200c
AU  - Tremblin, P.
AU  - Chabrier, G.
AU  - Baraffe, I.
AU  - Liu, M. C.
AU  - Magnier, E. A.
AU  - Lagage, P.-O.
AU  - Alves de Oliveira, C.
AU  - Burgasser, A. K.
AU  - Amundsen, D. S.
AU  - Drummond, B.
PY  - 2017
TI  - Cloudless atmospheres for young low-gravity substellar objects
JA  - Astrophys. J.
JO  - Astrophysical Journal
VL  - 850
SP  - 46
DO  - 10.3847/1538-4357/aa9214
ER  -

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