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Characterization of Exoplanet-Host Stars
Vardan Adibekyan, Sérgio G. Sousa, Nuno C. Santos
Precise and, if possible, accurate characterization of exoplanets cannot be dissociated from the characterization of their host stars. In this chapter we discuss different methods…
Constraining planet structure and composition from stellar chemistry: trends in different stellar populations
N. C. Santos, V. Adibekyan, C. Dorn +8
The chemical composition of stars that have orbiting planets provides important clues about the frequency, architecture, and composition of exoplanet systems. We explore the possib…
The Tc trend in the Zetta Reticuli system: N spectra - N trends
V. Adibekyan, P. Figueira, E. Delgado Mena +4
It is suggested that the chemical abundance trend with the condensation temperature, Tc , can be a signature of rocky planet formation or accretion. Recently, a strong Tc trend was…
How alien can alien worlds be?
V. Adibekyan, P. Figueira, N. C. Santos
In an attempt to select stars that can host planets with characteristics similar to our own, we selected seven solar-type stars known to host planets in the habitable zone and for…
Precise masses for the transiting planetary system HD 106315 with HARPS
S. C. C. Barros, H. Gosselin, J. Lillo-Box +45
The multi-planetary system HD 106315 was recently found in K2 data . The planets have periods of and days, and radii of a…
Abundance ratios \& ages of stellar populations in HARPS-GTO sample
E. Delgado Mena, M. Tsantaki, V. Zh. Adibekyan +4
In this work we present chemical abundances of heavy elements (Z28) for a homogeneous sample of 1059 stars from HARPS planet search program. We also derive ages using parallaxes…
Mg/Si mineralogical ratio of low-mass planet hosts. Correction for the NLTE effects
V. Adibekyan, H. M. Goncalves da Silva, S. G. Sousa N. C. Santos +2
Mg/Si and Fe/Si ratios are important parameters that control the composition of rocky planets. In this work we applied non-LTE correction to the Mg and Si abundances of stars with…
Understanding stellar activity-induced radial velocity jitter using simultaneous K2 photometry and HARPS RV measurements
M. Oshagh, N. C. Santos, P. Figueira +15
One of the best ways to improve our understanding of the stellar activity-induced signal in radial velocity (RV) measurements is through simultaneous high-precision photometric and…
Supernovae and their host galaxies - V. The vertical distribution of supernovae in disc galaxies
A. A. Hakobyan, L. V. Barkhudaryan, A. G. Karapetyan +6
We present an analysis of the height distributions of the different types of supernovae (SNe) from the plane of their host galaxies. We use a well-defined sample of 102 nearby SNe…
Observational evidence for two distinct giant planet populations
N. C. Santos, V. Adibekyan, P. Figueira +9
Analysis of the statistical properties of exoplanets, together with those of their host stars, are providing a unique view into the process of planet formation and evolution. In th…
Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program II: Cu, Zn, Sr, Y, Zr, Ba, Ce, Nd and Eu
E. Delgado Mena, M. Tsantaki, V. Zh. Adibekyan +4
To understand the formation and evolution of the different stellar populations within our Galaxy it is essential to combine detailed kinematical and chemical information for large…
The Distribution of Supernovae Relative to Spiral Arms of Host Disc Galaxies
L. S. Aramyan, A. A. Hakobyan, A. R. Petrosian +7
Using a sample of 215 supernovae (SNe), we analyse their positions relative to the spiral arms of their host galaxies, distinguishing grand-design (GD) spirals from non-GD (NGD) ga…
Sun-like stars unlike the Sun: Clues for chemical anomalies of cool stars
V. Adibekyan, E. Delgado-Mena, S. Feltzing +11
We present a summary of the splinter session "Sun-like stars unlike the Sun" that was held on 09 June 2016 as part of the Cool Stars 19 conference (Uppsala, Sweden). We discussed t…
Formation and evolution of exoplanets in different environments
Vardan Adibekyan
The ultimate goal of exoplanetologists is to discover life outside our Earth and to fully understand our place in the Universe. Even though we have never been closer to attaining t…