HD 213885b: A transiting 1-day-period super-Earth with an Earth-like composition around a bright ($V=7.9$) star unveiled by TESS

Autor: Rafael Brahm, Caroline Dorn, Andrés Jordán, Christopher E. Henze, Jack J. Lissauer, Néstor Espinoza, Thomas Henning, Rhodes Hart, Olivier Demangeon, John F. Kielkopf, Eric L. N. Jensen, Andrei Tokovinin, Stéphane Udry, Sara Seager, Natalia Guerrero, J. Lillo-Box, Krzysztof G. Hełminiak, Benjamin F. Cooke, Oliver Turner, H. Giles, Nuno C. Santos, David W. Latham, Joshua N. Winn, Geof Wingham, Maxime Marmier, David Barrado, Damien Ségransan, Tansu Daylan, Patricia T. Boyd, Felipe Rojas, George R. Ricker, François Bouchy, John P. Doty, Martin Schlecker, P. Figueira, S. G. Sousa, Joseph D. Twicken, Karen A. Collins, Diana Kossakowski, Francesco Pepe, Peter J. Wheatley, David J. Armstrong, Matthew P. Battley, James S. Jenkins, Louise D. Nielsen, Daniel Bayliss, Vardan Adibekyan, Robert L. Morris, Aaron Dean Chacon, Ian J. M. Crossfield, Carl Ziegler, Matías R. Díaz, Claudia Aguilera-Gómez, Nicholas M. Law, Paula Sarkis, Jon M. Jenkins, C. Briceño, Christophe Lovis, S. C. C. Barros, Don Pollacco, Xavier Dumusque, Edward M. Bryant, Andrew W. Mann
Přispěvatelé: Barrado, D. [https://orcid.org/0000-0002-5971-9242], Lillo Box, J. [https://orcid.org/0000-0003-3742-1987], Díaz, M. [https://orcid.org/0000-0002-2100-3257], Wheatley, P. [https://orcid.org/0000-0003-1452-2240], Nielsen, L. D. [https://orcid.org/0000-0002-5254-2499], Figueira, P. [https://orcid.org/0000-0001-8504-283X], Jenssen, E. [https://orcid.org/0000-0002-4625-7333], Barros, S. [https://orcid.org/0000-0003-2434-3625], Espinoza Pérez, N. [https://orcid.org/0000-0001-9513-1449], Armstrong, D. J. [https://orcid.org/0000-0002-5080-4117], Bayliss, D. [https://orcid.org/0000-0001-6023-1335], Turner, O. [https://orcid.org/0000-0002-8216-2796], Sousa, S. G. [https://orcid.org/0000-0001-9047-2965], Kielpof, J. F. [https://orcid.org/0000-0003-0497-2651], Comisión Nacional de Investigación Científica y Tecnológica (CONICYT), Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT), Science and Technology Facilities Council (STFC), Swiss National Science Foundation (SNSF), Fundacao para a Ciencia e a Tecnologia (FCT), National Science Centre, Poland (NCN), Millennium Institute of Astrophysics (MAS)
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Digital.CSIC. Repositorio Institucional del CSIC
instname
DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacial
Instituto Nacional de Técnica Aeroespacial (INTA)
Monthly Notices of the Royal Astronomical Society
arXiv
ISSN: 4032-2467
Popis: Espinoza, N. et al.
We report the discovery of the 1.008-d, ultrashort period (USP) super-Earth HD 213885b (TOI-141b) orbiting the bright (V= 7.9) star HD 213885 (TOI-141, TIC 403224672), detected using photometry from the recently launched TESS mission. Using FEROS, HARPS, and CORALIE radial velocities, we measure a precise mass of 8.8 ±0.6M for this 1.74±0.05R exoplanet, which provides enough information to constrain its bulk composition - similar to Earth's but enriched in iron. The radius, mass, and stellar irradiation of HD 213885b are, given our data, very similar to 55 Cancri e, making this exoplanet a good target to perform comparative exoplanetology of short period, highly irradiated super-Earths. Our precise radial velocities reveal an additional 4.78-d signal which we interpret as arising from a second, non-transiting planet in the system, HD 213885c, whose minimum mass of 19.9 ± 1.4 M makes it consistent with being a Neptune-mass exoplanet. The HD 213885 system is very interesting from the perspective of future atmospheric characterization, being the second brightest star to host an USP transiting super-Earth (with the brightest star being, in fact, 55 Cancri). Prospects for characterization with present and future observatories are discussed.
With funding from the Spanish government through the "María de Maeztu Unit of Excellence" accreditation (MDM-2017-0737)
Databáze: OpenAIRE
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