Stellar Spectroscopy during Exoplanet Transits: Dissecting fine structure across stellar surfaces

Autor:	Dravins, Dainis, Ludwig, Hans-Günter, Dahlén, Erik, Pazira, Hiva
Rok vydání:	2014
Předmět:	Astrophysics - Solar and Stellar Astrophysics Astrophysics - Instrumentation and Methods for Astrophysics
Druh dokumentu:	Working Paper
Popis:	Differential spectroscopy during exoplanet transits permits to reconstruct spectra of small stellar surface portions that successively become hidden behind the planet. The center-to-limb behavior of stellar line shapes, asymmetries and wavelength shifts will enable detailed tests of 3-dimensional hydrodynamic models of stellar atmospheres, such that are required for any precise determination of abundances or seismic properties. Such models can now be computed for widely different stars but have been feasible to test in detail only for the Sun with its resolved surface structure. Although very high quality spectra are required, already current data permit reconstructions of line profiles in the brightest transit host stars such as HD209458 (G0 V). Comment: 12 pages, 11 figures; Presented at 18th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (Flagstaff, Arizona; June 2014). To appear in Proceedings of Lowell Observatory (G.van Belle, H.Harris, eds.), 2014
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1408.1402 Zobrazit plný text záznamu View this record from Arxiv