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CITATION.cff
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cff-version: 1.2.0
title: >-
SPRIGHT: a probabilistic mass-density-radius relation for small planets
message: >-
If you made the use of Spright, I would appreciate it if you give credit.
authors:
- given-names: Hannu
family-names: Parviainen
email: [email protected]
affiliation: Instituto de Astrofísica de Canarias
orcid: 'https://orcid.org/0000-0001-5519-1391'
- given-names: Rafael
family-names: Luque
email: [email protected]
affiliation: University of Chicago
orcid: 'https://orcid.org/0000-0002-4671-2957'
- given-names: Enric
family-names: Palle
email: [email protected]
affiliation: Instituto de Astrofísica de Canarias
orcid: 'https://orcid.org/0000-0003-0987-1593'
identifiers:
- type: doi
value: 10.1093/mnras/stad3504
repository-code: 'https://github.com/hpparvi/spright'
abstract: >-
We present SPRIGHT, a PYTHON package that implements a
fast and lightweight mass-density-radius relation for
small planets. The relation represents the joint planetary
radius and bulk density probability distribution as a mean
posterior predictive distribution of an analytical
three-component mixture model. The analytical model, in
turn, represents the probability for the planetary bulk
density as three generalized Student's t-distributions
with radius-dependent weights and means based on
theoretical composition models. The approach is based on
Bayesian inference and aims to overcome the rigidity of
simple parametric mass-radius relations and the danger of
overfitting of non-parametric mass-radius relations. The
package includes a set of pre-trained and ready-to-use
relations based on two M-dwarf catalogues, one catalogue
containing stars of spectral types F, G, and K (FGK
stars), and two theoretical composition models for
water-rich planets. The inference of new models is easy
and fast, and the package includes a command line tool
that allows for coding-free use of the relation, including
the creation of publication-quality plots. Additionally,
we study whether the current mass and radius observations
of small exoplanets support the presence of a population
of water-rich planets positioned between rocky planets and
sub-Neptunes. The study is based on Bayesian model
comparison and shows somewhat strong support against the
existence of a water-world population around M dwarfs.
However, the results of the study depend on the chosen
theoretical water-world density model. A more conclusive
result requires a larger sample of precisely characterized
planets and community consensus on a realistic water-world
interior structure and atmospheric composition model.
keywords:
- exoplanets
preferred-citation:
type: article
title: >-
SPRIGHT: a probabilistic mass-density-radius relation for small planets
authors:
- given-names: Hannu
family-names: Parviainen
email: [email protected]
affiliation: Instituto de Astrofísica de Canarias
orcid: 'https://orcid.org/0000-0001-5519-1391'
- given-names: Rafael
family-names: Luque
email: [email protected]
affiliation: University of Chicago
orcid: 'https://orcid.org/0000-0002-4671-2957'
- given-names: Enric
family-names: Palle
email: [email protected]
affiliation: Instituto de Astrofísica de Canarias
orcid: 'https://orcid.org/0000-0003-0987-1593'
doi: "10.1093/mnras/stad3504"
journal: 'MNRAS'
year: 2024
month: 1
start: 5693
end: 5716
volume: 527
number: 3
url: 'https://academic.oup.com/mnras/article/527/3/5693/7420509'
license: GPL-3.0