Theoretical Emission Spectra of Atmospheres of Hot Rocky Super-Earths
Yuichi Ito (1), Masahiro Ikoma (1), Hajime Kawahara (1), Hiroko Nagahara (1), Yui Kawashima (1), Taishi Nakamoto (2) ((1) The University of Tokyo, (2) Tokyo Institute of Technology)
(Submitted on 22 Jan 2015)
Motivated by recent detection of transiting high-density super-Earths, we explore the detectability of hot rocky super-Earths orbiting very close to their host stars. In the environment hot enough for their rocky surfaces to be molten, they would have the atmosphere composed of gas species from the magma oceans. In this study, we investigate the radiative properties of the atmosphere that is in the gas/melt equilibrium with the underlying magma ocean.
Our equilibrium calculations yield Na, K, Fe, Si, SiO, O, and O2 as the major atmospheric species. We compile the radiative-absorption line data of those species available in literature, and calculate their absorption opacities in the wavelength region of 0.1–100~μm. Using them, we integrate the thermal structure of the atmosphere.
Then, we find that thermal inversion occurs in the atmosphere because of the UV absorption by SiO. In addition, we calculate the ratio of the planetary to stellar emission fluxes during secondary eclipse, and find prominent emission features induced by SiO at 4~μm detectable by Spitzer, and those at 10 and 100~μm detectable by near-future space telescopes.
Comments:15 pages, 12 figures, accepted for publication in ApJ
Subjects:Earth and Planetary Astrophysics (astro-ph.EP)
Cite as:arXiv:1501.05393 [astro-ph.EP] (or arXiv:1501.05393v1 [astro-ph.EP] for this version)
Submission history
From: Yuichi Ito
[v1] Thu, 22 Jan 2015 04:41:29 GMT (3042kb)
