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TOI-1695 b: A Water World Orbiting an Early-M Dwarf in the Planet Radius Valleyстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Cherubim Collin, Cloutier Ryan, Charbonneau David, Stockdale Chris, Stassun Keivan G., Schwarz Richard P., Safonov Boris, Mortier Annelies, Lewin Pablo, Latham David W., Horne Keith, Haywood Raphaëlle D., Gonzales Erica, Goliguzova Maria V., Collins Karen A., Ciardi David R., Bieryla Allyson, Belinski Alexandre A., Wohler Bill, Watson Christopher A., Vanderspek Roland, Udry Stéphane, Sozzetti Alessandro, Ségransan Damien, Sasselov Dimitar, Ricker George R., Rice Ken, Poretti Ennio, Piotto Giampaolo, Pepe Francesco, Molinari Emilio, Micela Giuseppina, Mayor Michel, Lovis Christophe, López-Morales Mercedes, Jenkins Jon M., Essack Zahra, Dumusque Xavier, Doty John P., Colón Knicole D., Cameron Andrew Collier, Buchhave Lars A.
- Журнал: Astronomical Journal
- Том: 165
- Номер: 4
- Год издания: 2023
- Издательство: American Astronomical Society
- Местоположение издательства: United States
- Первая страница: 167
- DOI: 10.3847/1538-3881/acbdfd
- Аннотация: Characterizing the bulk compositions of transiting exoplanets within the M dwarf radius valley offers a unique means to establish whether the radius valley emerges from an atmospheric mass-loss process or is imprinted by planet formation itself. We present the confirmation of such a planet orbiting an early-M dwarf (T mag = 11.0294 ± 0.0074, M s = 0.513 ± 0.012 M ⊙, R s = 0.515 ± 0.015 R ⊙, and T eff = 3690 ± 50 K): TOI-1695 b (P = 3.13 days and ${R}_{p}={1.90}_{-0.14}^{+0.16}\ {R}_{\oplus }$ ). TOI-1695 b's radius and orbital period situate the planet between model predictions from thermally driven mass loss versus gas depleted formation, offering an important test case for radius valley emergence models around early-M dwarfs. We confirm the planetary nature of TOI-1695 b based on five sectors of TESS data and a suite of follow-up observations including 49 precise radial velocity measurements taken with the HARPS-N spectrograph. We measure a planetary mass of 6.36 ± 1.00 M ⊕, which reveals that TOI-1695 b is inconsistent with a purely terrestrial composition of iron and magnesium silicate, and instead is likely a water-rich planet. Our finding that TOI-1695 b is not terrestrial is inconsistent with the planetary system being sculpted by thermally driven mass loss. We present a statistical analysis of seven well-characterized planets within the M dwarf radius valley demonstrating that a thermally driven mass-loss scenario is unlikely to explain this population.
- Добавил в систему: Сафонов Борис Сергеевич