Gas-depleted planet formation occurred in the four-planet system around the red dwarf LHS 1903

@misc{wilson2026gasdepleted,
  title = {{Gas-depleted planet formation occurred in the four-planet system around the red dwarf LHS 1903}},
  author = {Thomas Wilson and Anna Simpson and Andrew Collier Cameron and Ryan Cloutier and Vardan Adibekyan and Ancy Anna John and Yann Alibert and Manu Stalport and Jo Ann Egger and Andrea Bonfanti and Nicolas Billot and Pascal Guterman and Pierre Maxted and Attila Simon and Sérgio Sousa and Malcolm Fridlund and Mathias Beck and Anja Bekkelien and Sébastien Salmon and Valérie van Grootel and Luca Fossati and Alexander James Mustill and Hugh Osborn and Tiziano Zingales and Matthew Hooton and Laura Affer and Suzanne Aigrain and Roi Alonso and Guillem Anglada and Alexandros Antoniadis-Karnavas and Tamas Bárczy and David Barrado Navascues and Susana Barros and Wolfgang Baumjohann and Thomas Beck and Willy Benz and Federico Biondi and Xavier Bonfils and Luca Borsato and Alexis Brandeker and Christopher Broeg and Lars Buchhave and Maximilian Buder and Juan Cabrera and Sebastian Carrazco Gaxiola and David Charbonneau and Sébastien Charnoz and David Ciardi and Karen Collins and Kevin Collins and Rosario Cosentino and Szilard Csizmadia and Patricio Cubillos and Shweta Dalal and Mario Damasso and James Davenport and Melvyn Davies and Magali Deleuil and Laetitia Delrez and Olivier Demangeon},
  howpublished = {HAL},
  year = {2026},
  month = oct,
  doi = {10.1126/science.adl2348},
  eprint = {2602.11271},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05843511v1},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Gas-depleted planet formation occurred in the four-planet system around the red dwarf LHS 1903
AU  - Thomas Wilson
AU  - Anna Simpson
AU  - Andrew Collier Cameron
AU  - Ryan Cloutier
AU  - Vardan Adibekyan
AU  - Ancy Anna John
AU  - Yann Alibert
AU  - Manu Stalport
AU  - Jo Ann Egger
AU  - Andrea Bonfanti
AU  - Nicolas Billot
AU  - Pascal Guterman
AU  - Pierre Maxted
AU  - Attila Simon
AU  - Sérgio Sousa
AU  - Malcolm Fridlund
AU  - Mathias Beck
AU  - Anja Bekkelien
AU  - Sébastien Salmon
AU  - Valérie van Grootel
AU  - Luca Fossati
AU  - Alexander James Mustill
AU  - Hugh Osborn
AU  - Tiziano Zingales
AU  - Matthew Hooton
AU  - Laura Affer
AU  - Suzanne Aigrain
AU  - Roi Alonso
AU  - Guillem Anglada
AU  - Alexandros Antoniadis-Karnavas
AU  - Tamas Bárczy
AU  - David Barrado Navascues
AU  - Susana Barros
AU  - Wolfgang Baumjohann
AU  - Thomas Beck
AU  - Willy Benz
AU  - Federico Biondi
AU  - Xavier Bonfils
AU  - Luca Borsato
AU  - Alexis Brandeker
AU  - Christopher Broeg
AU  - Lars Buchhave
AU  - Maximilian Buder
AU  - Juan Cabrera
AU  - Sebastian Carrazco Gaxiola
AU  - David Charbonneau
AU  - Sébastien Charnoz
AU  - David Ciardi
AU  - Karen Collins
AU  - Kevin Collins
AU  - Rosario Cosentino
AU  - Szilard Csizmadia
AU  - Patricio Cubillos
AU  - Shweta Dalal
AU  - Mario Damasso
AU  - James Davenport
AU  - Melvyn Davies
AU  - Magali Deleuil
AU  - Laetitia Delrez
AU  - Olivier Demangeon
PY  - 2026
DA  - 2026/10/29
PB  - HAL
DO  - 10.1126/science.adl2348
UR  - https://hal.science/hal-05843511v1
AB  - Small exoplanet radii show two populations, referred to as super-Earths and sub-Neptunes, separated by a gap known as the radius valley. This may be produced by the removal of atmospheres due to stellar or internal heating, or lack of an initial envelope. We use transit photometry and radial velocity measurements to detect and characterize four planets orbiting LHS 1903, a red dwarf (M-dwarf) star in the Milky Way's thick disk. The planets have orbital periods between 2.2 and 29.3 days, and span the radius valley within a single planetary system. The derived densities indicate that LHS 1903 b is rocky, while LHS 1903 c and LHS 1903 d have extended atmospheres. Although the most distant planet from
ER  -