Protostars and Planets VI, Heidelberg, July 15-20, 2013

Poster 2K002

Modeling Brown Dwarfs using ab initio equation of state data

Becker, Andreas (Institute of Physics, University of Rostock)
Lorenzen, Winfried (Institute of Physics, University of Rostock)
Nettelmann, Nadine (Department of Astronomy and Astrophysics, University of California, Santa Cruz)
Redmer, Ronald (Institute of Physics, University of Rostock)

We present wide-range equations of state (EOS) for hydrogen and helium including accurate data derived from finite-temperature density functional theory molecular dynamics (FT-DFT-MD) simulations for the warm dense matter regime using the VASP package [1]. This hydrogen/helium Rostock EOS (H/He-REOS) cover a wide range of temperatures and densities with a maximum error of 5%. Based on this ab initio data set we calculate interior models and mass-radius (MR) relations for Giant Planets and particularly for Brown Dwarfs. The latter need EOS data for the 1 bar level („ń ”­ 10−5g/cm3, T ”­ 1000 K) as well as for central conditions with ”­ 150 Gbar („ń ”­ 250g/cm3, T ”­ 3 MK). We compare our interior models and the MR relations with those based on the Saumon-Chabrier-van Horn (SCvH) EOS [2]. [1] G. Kresse and J. Furthm”§uller, Phys. Rev. B 54, 11169 (1996) [2] D. Saumon, G. Chabrier, and H. M. van Horn, Astrophys. J. Suppl. Ser. 99, 713 (1995)

Click here to view poster PDF