Does PSR J0337+1715 Contain the Smallest Exoplanet Known?

Описание: This video serves as an addendum to my last video on the exotic PSR J0337+1715 triple system, discussing the recent paper constraining its candidate exoplanet’s mass to just 0.004 Earth masses or so, making it by far the smallest known exoplanet. The planet's orbit is also constrained, revealing clues about its formation and the history of this bizarre stellar system as a whole.

This small object may be called a dwarf planet on account of its puniness. But the current definitions of a planet used by the IAU are vague and Solar System centric. Under some other definitions of a planet, the object in the PSR J0337+1715 system does seem to fall under the category of dwarf planet, making it one of the first ever detected outside our Solar System.

Sources:
https://arxiv.org/abs/2411.10066 - new Voisin and collaborators paper
https://arxiv.org/abs/1401.0941 - Tauris and van den Heuvel formation channel for the system (used by Voisin and collaborators)
https://academic.oup.com/mnras/articl... - Sabach and Soker formation channel for the system (which I cited)
https://ui.adsabs.harvard.edu/abs/201... - paper which mentions planetary discriminant
https://ui.adsabs.harvard.edu/abs/202... - 2024 paper which gives mass-based criteria for planet definition

Music:
Lombus - Amino (SpaceEngine music)
Lokijar - Nks (SpaceEngine music, slightly extended for the video)

Footage from:
SpaceEngine
Celestia
various institutions such as NASA, ESA, and others which I have credited in the video

0:00 Introduction
1:02 The Study
1:37 Planetary Parameters
2:14 Orbital Parameters
3:14 Alternative Explanations
3:47 How Did the Planet Form?
5:17 Did It Survive a Supernova?
6:34 Is It a Dwarf Planet?