Nitrogen Abundances in Stars with Planets

By Keith Cowing
Press Release
May 11, 2016
Filed under
Nitrogen Abundances in Stars with Planets

Carbon, nitrogen, and oxygen (CNO) are key elements in stellar formation and evolution, and their abundances should also have a significant impact on planetary formation and evolution. We present a detailed spectroscopic analysis of 74 solar-type stars, 42 of which are known to harbour planets.

We determine the nitrogen abundances of these stars and investigate a possible connection between N and the presence of planetary companions. We used VLT/UVES to obtain high-resolution near-UV spectra of our targets. Spectral synthesis of the NH band at 3360A was performed with the spectral synthesis codes MOOG and FITTING. We identify several spectral windows from which accurate N abundance can be obtained. Nitrogen distributions for stars with and without planets show that planet hosts are nitrogen-rich when compared to single stars.

However, given the linear trend between [N/Fe] vs [Fe/H], this fact can be explained as being due to the metal-rich nature of planet hosts. We conclude that reliable N abundances can be derived for metal-rich solar type stars from the near UV molecular band at 3360A. We confirm a linear trend between [N/Fe] and metallicity expected from standard models of Galactic chemical evolution.

CNO Behavior in Planet-harbouring Stars: Nitrogen Abundances in stars with planets

L. Suárez-Andrés, G. Israelian, J.I. González Hernández, V. Zh. Adibekyan, E. Delgado Mena, N. C. Santos, S. G. Sousa
(Submitted on 10 May 2016)

Comments: 10 pages, 8 figures,. Accepted in A&A
Subjects: Solar and Stellar Astrophysics (astro-ph.SR); Earth and Planetary Astrophysics (astro-ph.EP); Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:1605.03049 [astro-ph.SR] (or arXiv:1605.03049v1 [astro-ph.SR] for this version)
Submission history
From: Lucía Suárez-Andrés
[v1] Tue, 10 May 2016 15:09:22 GMT (1253kb,D)

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