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Supernovae Distribution and Host Galaxy Properties
A. A. Hakobyan, A. G. Karapetyan, L. V. Barkhudaryan +6
We present the summary of our last results on the spatial distribution and relative frequencies of Supernovae (SNe) in a large number of host galaxies from the Sloan Digital Sky Su…
CNO behaviour in planet-harbouring stars. II. Carbon abundances in stars with and without planets using the CH band
L. Suárez-Andrés, G. Israelian, J. I. González Hernández +4
Context. Carbon, oxygen and nitrogen (CNO) are key elements in stellar formation and evolution, and their abundances should also have a significant impact on planetary formation an…
Behaviour of elements from lithium to europium in stars with and without planets
T. Mishenina, V. Kovtyukh, C. Soubiran +1
We conducted an analysis of the distribution of elements from lithium to europium in 200 dwarfs in the solar neighbourhood ~20 pc with temperatures in the range 4800-6200 K and met…
EELT-HIRES the high-resolution spectrograph for the E-ELT
A. Marconi, P. Di Marcantonio, V. D'Odorico +70
The first generation of E-ELT instruments will include an optical-infrared High Resolution Spectrograph, conventionally indicated as EELT-HIRES, which will be capable of providing…
The Impact of Bulges on the Radial Distribution of Supernovae in Disc Galaxies
A. A. Hakobyan, A. G. Karapetyan, L. V. Barkhudaryan +6
We present the results of the analysis of the impact of bulges on the radial distributions of the different types of supernovae (SNe) in the stellar discs of host galaxies with var…
A Comparison of Stellar Elemental Abundance Techniques and Measurements
Natalie R. Hinkel, Patrick A. Young, Michael D. Pagano +15
Stellar elemental abundances are important for understanding the fundamental properties of a star or stellar group, such as age and evolutionary history, as well as the composition…
The impact of bars on the radial distribution of supernovae in disc galaxies
A. A. Hakobyan, A. G. Karapetyan, L. V. Barkhudaryan +6
We present an analysis of the impact of bars on the radial distributions of the different types of supernovae (SNe) in the stellar discs of host galaxies with various morphologies.…
Is the activity level of HD 80606 influenced by its eccentric planet?
P. Figueira, A. Santerne, A. Suárez Mascareño +14
Aims: Several studies suggest that the activity level of a planet-host star can be influenced by the presence of a close-by orbiting planet. Moreover, the interaction mechanisms th…
Abundance trend with condensation temperature for stars with different Galactic birth places
V. Adibekyan, E. Delgado-Mena, P. Figueira +9
During the past decade, several studies reported a correlation between chemical abundances of stars and condensation temperature (also known as Tc trend). However, the real astroph…
An extreme planetary system around HD219828. One long-period super Jupiter to a hot-neptune host star
N. C. Santos, A. Santerne, J. P. Faria +19
With about 2000 extrasolar planets confirmed, the results show that planetary systems have a whole range of unexpected properties. We present a full investigation of the HD219828 s…
CNO behaviour in planet-harbouring stars. I Nitrogen abundances in stars with planets
L. Suárez-Andrés, G. Israelian, J. I. González Hernández +4
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 evolut…
Ret, its debris disk, and its lonely stellar companion Ret. Different trends for different spectra
V. Adibekyan, E. Delgado-Mena, P. Figueira +8
Several studies have reported a correlation between the chemical abundances of stars and condensation temperature (known as Tc trend). Very recently, a strong Tc trend was reported…
K2-110 b - a massive mini-Neptune exoplanet
H. P. Osborn, A. Santerne, S. C. C. Barros +33
We report the discovery of the exoplanet K2-110 b (previously EPIC212521166b) from K2 photometry orbiting in a 13.8637d period around an old, metal-poor K3 dwarf star. With a V-ban…
Supernovae and their host galaxies - IV. The distribution of supernovae relative to spiral arms
L. S. Aramyan, A. A. Hakobyan, A. R. Petrosian +7
Using a sample of 215 supernovae (SNe), we analyze their positions relative to the spiral arms of their host galaxies, distinguishing grand-design (GD) spirals from non-GD (NGD) ga…
The Gaia-ESO Survey: Sodium and aluminium abundances in giants and dwarfs - Implications for stellar and Galactic chemical evolution
R. Smiljanic, D. Romano, A. Bragaglia +40
Stellar evolution models predict that internal mixing should cause some sodium overabundance at the surface of red giants more massive than ~ 1.5--2.0 Msun. The surface aluminium a…
EPIC211089792 b: an aligned and inflated hot jupiter in a young visual binary
A. Santerne, G. Hébrard, J. Lillo-Box +71
In the present paper we report the discovery of a new hot Jupiter, EPIC211089792 b, first detected by the Super-WASP observatory and then by the K2 space mission during its campaig…
A pragmatic Bayesian perspective on correlation analysis: The exoplanetary gravity - stellar activity case
P. Figueira, J. P. Faria, V. Zh. Adibekyan +2
We apply the Bayesian framework to assess the presence of a correlation between two quantities. To do so, we estimate the probability distribution of the parameter of interest, …
Searching for Li-rich giants in a sample of 12 open clusters: Li enhancement in two stars with substellar companions
E. Delgado Mena, M. Tsantaki, S. G. Sousa +6
The aim of this work is to search for Li-rich giants in a sample of clusters where planets have been searched, thus we can study the planet engulfment scenario to explain Li replen…