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Related Experiment Video

Updated: Jul 17, 2025

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves

Published on: May 10, 2020

A super-massive Neptune-sized planet.

Luca Naponiello^1,2,3,4, Luigi Mancini^5,6,7, Alessandro Sozzetti⁶

¹Department of Physics, University of Rome "Tor Vergata", Rome, Italy. lnaponiello@roma2.infn.it.

|August 30, 2023

Summary

This summary is machine-generated.

The dense, Neptune-sized exoplanet TOI-1853 b, found in the hot-Neptune desert, challenges formation theories with its high mass and density. Its unusual composition may result from planet collisions or inward migration.

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Last Updated: Jul 17, 2025

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves

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Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Area of Science:

Exoplanetary Science
Planetary Formation and Evolution
Astrophysics

Background:

Neptune-sized planets display diverse compositions and densities, influenced by formation location and atmospheric escape.
These planets range from low-density, hydrogen-helium-rich worlds to denser planets with water or rocky interiors.
The 'hot-Neptune desert' is a region near stars with a scarcity of Neptune-sized planets, offering clues to planetary system evolution.

Purpose of the Study:

To report the discovery and characterization of the transiting exoplanet TOI-1853 b.
To investigate the unusual properties of TOI-1853 b and its implications for planetary formation theories.
To understand the formation and evolutionary pathways of planets within the hot-Neptune desert.

Main Methods:

Observations of the transiting planet TOI-1853 b using transit photometry.
Determination of the planet's radius (3.46 ± 0.08 Earth radii) and orbital period (1.24 days).
Measurement of the planet's mass (73.2 ± 2.7 Earth masses) and calculation of its density (9.7 ± 0.8 g/cm³).

Main Results:

TOI-1853 b is a Neptune-sized planet with a mass nearly double that of previously known planets in its size class.
The planet's high density suggests a composition dominated by heavy elements, unlike typical Neptune-sized planets.
Its location within the hot-Neptune desert and extreme density present a significant puzzle for current models.

Conclusions:

TOI-1853 b's properties challenge conventional planetary formation and evolution theories.
Its existence may be explained by multiple high-energy proto-planet collisions.
Alternatively, it could represent the end state of a highly eccentric planet that migrated inward towards its host star.