J/A+A/649/A111 Ages of the planet host stars (Adibekyan+, 2021)
Stellar clustering and orbital architecture of planetary systems..
Adibekyan V., Santos N.C., Demangeon O.D.S., Faria J.P., Barros S.C.C.,
Oshagh M., Figueira P., Delgado Mena E., Sousa S.G., Israelian G.,
Campante T., Hakobyan A.A.
<Astron. Astrophys. 649, A111 (2021)>
=2021A&A...649A.111A 2021A&A...649A.111A (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Stars, ages
Keywords: methods: statistical - planets and satellites: formation -
planet-star interactions - stars: fundamental parameters
Abstract:
Revealing the mechanisms shaping the architecture of planetary systems
is crucial for our understanding of their formation and evolution. In
this context, it has been recently proposed that stellar clustering
might be the key in shaping the orbital architecture of exoplanets.
The main goal of this work is to explore the factors that shape the
orbits of planets.
We performed different statistical tests to compare the properties of
planets and their host stars associated with different stellar
environments. Results. We used a homogeneous sample of relatively
young FGK dwarf stars with radial velocity detected planets and tested
the hypothesis that their association to phase space
(position-velocity) over-densities ("cluster" stars) and
under-densities ("field" stars) impacts the orbital periods of
planets. When controlling for the host star properties on a sample of
52 planets orbiting around cluster stars and 15 planets orbiting
around field stars, we found no significant difference in the period
distribution of planets orbiting these two populations of stars. By
considering an extended sample of 73 planets orbiting around cluster
stars and 25 planets orbiting field stars, a significant difference in
the planetary period distributions emerged. However, the hosts
associated with stellar under-densities appeared to be significantly
older than their cluster counterparts. This does not allow us to
conclude as to whether the planetary architecture is related to age,
environment, or both. We further studied a sample of planets orbiting
cluster stars to study the mechanism responsible for the shaping of
orbits of planets in similar environments. We could not identify a
parameter that can unambiguously be responsible for the orbital
architecture of massive planets, perhaps, indicating the complexity of
the issue.
An increased number of planets in clusters and in over-density
environments will help to build large and unbiased samples which will
then allow to better understand the dominant processes shaping the
orbits of planets.
Description:
The file ages.dat lists the ages of the planet host stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ages.dat 48 177 Ages of the planet host stars
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See also:
J/other/Nat/586.528 : Properties of exoplanet host stars (Winter+, 2020)
Byte-by-byte Description of file: ages.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Star's identifier
11- 14 I4 K Teff Effective Temperature
16- 18 I3 K e_Teff Uncertainity of effective Temperature
20- 23 F4.2 [cm/s2] logg Surface gravity
25- 28 F4.2 [cm/s2] e_logg Uncertainity of surface gravity
30- 34 F5.2 [Sun] [Fe/H] Iron abundance [Fe/H]
36- 39 F4.2 [Sun] e_[Fe/H] Uncertainity of iron abundance [Fe/H]
41- 44 F4.1 Gyr Age Isochrone ages
46- 48 F3.1 Gyr e_Age Uncertainity of isochrone ages
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Acknowledgements:
Vardan Adibekyan, Vardan.Adibekyan(at)astro.up.pt
(End) Vardan Adibekyan [IA], Patricia Vannier [CDS] 15-Mar-2021