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Gas-depleted planet formation occurred in the four-planet system around the red dwarf LHS 1903.
Thomas G Wilson, Anna M Simpson, Andrew Collier Cameron, Ryan Cloutier, Vardan Adibekyan, A. A. John, Yann Alibert, M. Stalport, A. Bonfanti, J. A. Egger, Nicolas Billot, P. Guterman, Pierre F L Maxted, Attila E. Simon, S. G. Sousa, Malcolm Fridlund, Mathias Beck, A. Bekkelien, Sébastien Salmon, Valerie Van Grootel, Luca Fossati, Alexander James Mustill, Hugh P. Osborn, T. Zingales, L. Affer, M. J. Hooton, S. Aigrain, Roi Alonso, Guillem Anglada, A. Antoniadis-Karnavas, T. Bárczy, David Barrado Navascues, Susana C C Barros, W. Baumjohann, T. Beck, Willy Benz, Federico Biondi, Xavier Bonfils, L. Borsato, A. Brandeker, Lars A. Buchhave, Maximilian Buder, Christopher H. Broeg, Juan Cabrera, Sebastian Carrazco Gaxiola, David Charbonneau, S. Charnoz, David R. Ciardi, Karen A. Collins, Kevin I. Collins, R. Cosentino, Szilard Csizmadia, Patricio E Cubillos, S. Dalal, M. Damasso, James R A Davenport, M. B. Davies, Magali Deleuil, Laetitia Delrez, Olivier D S Demangeon, Victoria DiTomasso, Diana Dragomir, Brice-Olivier Demory, Courtney D. Dressing, Xavier Dumusque, David Ehrenreich, Anders Erikson, E. Esparza-Borges, A. Fortier, Izuru Fukuda, Akihiko Fukui, D. Gandolfi, Adriano Ghedina, Steven Giacalone, Holden Gill, Michaël Gillon, Y. Gómez Maqueo Chew, M. Güdel, Pere Guerra, Maximilian N Günther, Nathan Hara, Avet Harutyunyan, Yuya Hayashi, R. D. Haywood, Rae Holcomb, Keith Horne, S. Hoyer, Chelsea X. Huang, Masahiro Ikoma, Kate G Isaak, James A G Jackman, Jon M. Jenkins, Eric L N Jensen, Daniel Jontof-Hutter, Yugo Kawai, L. L. Kiss, Ben S Lakeland, J. Laskar, David W Latham, Alain Lecavelier Des Etangs, Adrien Sebastien Leleu, Monika Lendl, Jerome de Leon, Florian Lienhard, Mercedes López-Morales, Christophe Lovis, Michael B. Lund, R. Luque, Demetrio Magrin, Luca Malavolta, Aldo F Martínez Fiorenzano, Andrew W. Mayo, Michel Mayor, C. Mordasini, Annelies Mortier, F. Murgas, Norio Narita, V. Nascimbeni, Belinda A Nicholson, Göran Olofsson, R. Ottensamer, Isabella Pagano, Larissa Palethorpe, Ε. Πάλλη, H. Parviainen, M. Pedani, Francesco Alfonso Pepe, Gisbert Peter, Matteo Pinamonti, G. Piotto, Don Pollacco, Ennio Poretti, Didier Queloz, Samuel N. Quinn, Roberto Ragazzoni, N. Rando, David Rapetti, F. Ratti, Heike Rauer, Federica Rescigno, Ignasi Ribas, Ken Rice, George R. Ricker, Paul Robertson, Thierry De Roche, L. Sabin, Nuno C. Santos, Dimitar D. Sasselov, A. B. Savel, G. Scandariato, Richard P. Schwarz, U. Schroffenegger, N. Schanche, Sara Seager, Ramotholo Sefako, Damien Ségransan, Avi Shporer, A. M. Silva, Alexis M S Smith, Alessandro Sozzetti, M. Steller, Gyula M. Szabó, Motohide Tamura, A. Tuson, Nicolas Thomas, Stéphane Udry, Andrew Vanderburg, Roland K. Vanderspek, Julia Venturini, Francesco Verrecchia, Nicholas A. Walton, Christopher Allan Watson, Robert D. Wells, Joshua N. Winn, Roberto Zambelli, Carl Ziegler
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Le résumé fourni par la source
The radii of small exoplanets form two populations, super-Earths and sub-Neptunes, separated by a gap known as the radius valley. This could be produced by the removal of some atmospheres by stellar or internal heating, or the lack of an initial envelope. We use transit photometry and radial velocity measurements to detect and characterize four exoplanets orbiting LHS 1903, a red dwarf star in the Milky Way's thick disk. The planets have orbital periods from 2.2 to 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. The most distant planet from the host star, LHS 1903 e, has no gaseous envelope, indicating it formed from gas-depleted material.
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Les sujets associés
Stellar, planetary, and galactic studiesAstronomy and Astrophysical ResearchEducational Leadership and Practices