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Extreme Lithium Depletion in Solar Twins: Challenging Non-Standard Mixing Models
Isabelle Winnick, Jhon Yana Galarza, Henrique Reggiani +12
Lithium (Li) is a powerful tracer of stellar mixing, gradually depleted in solar twins by non-standard transport below the convective zone. Here, we identify six new solar twins wi…
JWST/NIRSpec Observations of the Coldest Known Brown Dwarf
K. L. Luhman, P. Tremblin, C. Alves de Oliveira +6
We present 1-5um spectroscopy of the coldest known brown dwarf, WISE J085510.83-071442.5 (WISE 0855), performed with the Near-Infrared Spectrograph (NIRSpec) on board the James Web…
Two-dimensional simulations of solar-like models with artificially enhanced luminosity. II. Impact on internal gravity waves
A. Le Saux, T. Guillet, I. Baraffe +7
Artificially increasing the luminosity and the thermal diffusivity of a model is a common tactic adopted in hydrodynamical simulations of stellar convection. In this work, we analy…
Two-dimensional simulations of solar-like models with artificially enhanced luminosity -- I. Impact on convective penetration
I. Baraffe, J. Pratt, D. G. Vlaykov +4
We perform 2D, fully compressible, time-implicit simulations of convection in a solar-like model with the MUSIC code. Our main motivation is to explore the impact of a common tacti…
Suppression of lithium depletion in young low-mass stars from fast rotation
Thomas Constantino, Isabelle Baraffe, Thomas Goffrey +4
We compute rotating 1D stellar evolution models that include a modified temperature gradient in convection zones and criterion for convective instability inspired by rotating 3D hy…
Rotational spectral modulation of cloudless atmospheres for L/T Brown Dwarfs and Extrasolar Giant Planets
P. Tremblin, M. W. Phillips, A. Emery +5
The rotational spectral modulation (spectro-photometric variability) of brown dwarfs is usually interpreted as a sign of the presence of inhomogeneous cloud covers in the atmospher…