Hot Earth planet with half the mass of Venus passing through a nearby star


L 98-59 is a shiny M dwarf located at 10.6 pc. Located on the border of the continuous observation zone of the James Webb Space Telescope, this system is destined to become a cornerstone of the comparative exoplanetology of terrestrial planets. The three planets in transit have transmission spectrum metrics ranging from 49 to 255, making them prime targets for atmospheric characterization with the James Webb Space Telescope, the Hubble Space Telescope, Ariel, or ground facilities such as NIRPS or ESPRESSO. With an equilibrium temperature ranging from 416 to 627 K, they offer a unique opportunity to study the diversity of hot terrestrial planets. L 98-59 b and c have densities of 3.6 _ {- 1.5} ^ {+ 1.4} and 4.57_ {-0.85} ^ {+ 0.77} this URL http ^ {- 3}, respectively, and have very similar bulk compositions with a small core of iron which is only 12-14% of the total mass, and a small amount of water. However, with a density of 2.95 _ {- 0.51} ^ {+ 0.79} this URL http ^ {- 3} and despite a similar core mass fraction, up to 30% of the mass of L 98 -59 d could be water.

Olivier DS Demangeon, MR Zapatero Osorio, Y. Alibert, SCC Barros, V. Adibekyan, HM Tabernero, A. Antoniadis-Karnavas, JD Camacho, A. Suárez Mascareño, M. Oshagh, G. Micela, SG Sousa, C. Lovis , FA Pepe, R. Rebolo, S. Cristiani, NC Santos, R. Allart, C. Allende Prieto, D. Bossini, F. Bouchy, A. Cabral, M. Damasso, P. Di Marcantonio, V. D’Odorico , D. Ehrenreich, J. Faria, P. Figueira, R. Génova Santos, J. Haldemann, N. Hara, JI González Hernández, B. Lavie, J. Lillo-Box, G. Lo Curto, CJAP Martins, D. Mégevand, A. Mehner, P. Molaro, NJ Nunes, E. Pallé, L. Pasquini, E. Poretti, A. Sozzetti, S. Udry

Please follow Astrobiology on Twitter. Comments: 38 pages, 23 figures, Accepted for publication in Astronomy & AstrophysicsSubjects: Earth and Planetary Astrophysics (astro-ph.EP) DOI: 10.1051 / 0004-6361 / 202140728 Cite as: arXiv: 2108.03323 (or arXiv: 2108.03323v1 for this version) History of submissions From: Olivier DS Demangeon Friday August 6, 2021 22:33:50 UTC (6,084 KB) Astrobiology,

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