Ariel Stellar Catalogue

The homogeneous Ariel stellar catalogue currently includes the following parameters:

Identification parameters
Photometric properties
Kinematics properties (galactic positions, velocities, parallaxes)
Effective temperature, surface gravity and [Fe/H] for 370 stars
vsin(i), vmicro
Mass*, Radius, age
Abundances of C, N, O for 181 stars

*Notes: the stellar mass is always updated for all the stars anytime a release is done. This means that, for instance, following the constant development of the code (Bossini et al, in prep.) stellar masses for the targets initially included in Magrini et al, 2022 have been updated (with respect to the values reported in the paper).

The catalogue can be downloaded in .csv file here.

Details for the columns in the file can be found here.

Foreseen updates

Homogeneous:

logR'HK for ~200 stars (Wizani et al.) ;
stellar ages for 353 stars (Bossini et al.) ;
Refractory elements for 181 stars (Delgado Mena et al.)
limb darkening coefficients for 353 stars (both claret-4; power2 laws)

The catalogue parameter space

Kiel diagram of the catalogye stars. Stars analysed in R26 are shown as blue dots, those from M22 as orange stars, and those from T25 as green symbols.

The two grids correspond to PARSEC isochrones with ages from 0.1 to 14 Ga, in steps of 0.05 Ga, at solar metallicity (Z = 0.013, in purple) and at super-solar metallicity (Z = 0.06, in pink). The cross in the lower left corner indicates representative 1σ uncertainties for R26 ( ∆Teff = 110K and ∆logg = 0.04dex).

Figure from R26.

How to compute the stellar elemental abundance ratio ?

In the table we are providing the elemental abundances over hydrogen (by number), in the usual from A(El)=12+log(n(El)/N(H)) where n(El) is number density of the element El (i.e., the number of atoms of that element per unit volume) and n(H) is the number density of H .

To compute their ratio on the solar scale you have to:

[El/H]=A(El)−A(El)_Sun

To compute the abundance ratio over Fe on the solar scale:

[El/Fe]= A(El) - [Fe/H] - A(El)_Sun = [El/H]-[Fe/H]

To compute the abundance ratio (on a logarithmic scale) of two elements (without normalisation to the Sun):

log(El1/El2)=A(El1)- A(El2)

e.g. log(N/O)=A(N)-A(O)

This is particularly relevant when you want to normalise the planetary abundances, to its own stellar ones, to check for chemical enrichment of the planet and infer the planetary location formation within the context of its own planetary system.

The adopted solar abundances for C, N and O are:

A(C)_Sun = 8.43

A(N)_Sun = 7.83

A(O)_Sun = 8.69

Acknowledgments

for publications

When using this catalogue, please acknowledge this web site and include the following statement into your manuscript:

"This work made use of the Ariel Stellar Catalogue developed by the Stellar Characterisation WG in preparation of the ESA Ariel space mission"

Depending on whether your are using atmospheric parameters, elemental abundances, etc, please make sure to include the references to the team relevant publications (here).

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