Examinando por Autor "Brahm, R."

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HD 213885b: a transiting 1-d-period super-Earth with an Earth-like composition around a bright (V = 7.9) star unveiled by TESS .
(Oxford Academics: Blackwell Publishing, 2020-01-15) Espinoza, N.; Brahm, R.; Henning, T.; Jordán, A.; Dorn, C.; Rojas, F.; Sarkis, P.; Kossakowski, D.; Schlecker, M.; Díaz, M. R.; Jenkins, J. S.; Aguilera Gómez, C.; Jenkins, J. M.; Twicken, J. D.; Collins, K. A.; Lissauer, J. J.; Armstrong, D. J.; Adibekyan, V.; Barrado, D.; Barros, S. C. C.; Battley, M.; Bayliss, D.; Bouchy, F.; Bryant, E. M.; Cooke, B. F.; Demangeon, O. D. S.; Dumusque, X.; Figueira, P.; Giles, H.; Lillo Box, J.; Lovis, C.; Nielsen, L. D.; Pepe, F.; Pollacco, D.; Santos, N. C.; Sousa, S. G.; Udry, S.; Wheatley, P. J.; Turner, O.; Marmier, M.; Ségransan, D.; Ricker, G.; Latham, D.; Seager, S.; Winn, J. N.; Kielkopf, J. F.; Hart, R.; Wingham, G.; Jensen, E. L. N.; Helminiak, K. G.; Tokovinin, A.; Briceño, C.; Ziegler, C.; Law, N. M.; Mann, A. W.; Daylan, T.; Doty, J. P.; Guerrero, N.; Boyd, P.; Crossfield, I.; Morris, Robert L.; Henze, C. E.; Dean Chacon, A.; 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); 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]
We report the discovery of the 1.008-d, ultrashort period (USP) super-EarthHD213885b (TOI141b) 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 +/- 0.05 R. 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, whoseminimum mass of 19.9 +/- 1.4M. 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.