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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
Espinoza, Néstor Brahm, Rafael Henning, Thomas Jordán, Andrés Dorn, Caroline Rojas, Felipe Sarkis, Paula Kossakowski, Diana Schlecker, Martin Díaz, Matías R.
Espinoza, Néstor
Brahm, Rafael
Henning, Thomas
Jordán, Andrés
Dorn, Caroline
Rojas, Felipe
Sarkis, Paula
Kossakowski, Diana
Schlecker, Martin
Díaz, Matías R.
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Abstract
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 ± 0.6 M⊕ 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, 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.
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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date
2019-11-19
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Royal Astronomical Society
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Keywords
Techniques: photometric, Techniques: radial velocities, Planets and satellites: detection, Planets and satellites: fundamental parameters, Planets and satellites: individual: TOI-141, TIC 403224672, HD213885
Citation
Néstor Espinoza, Rafael Brahm, Thomas Henning, Andrés Jordán, Caroline Dorn, Felipe Rojas, Paula Sarkis, Diana Kossakowski, Martin Schlecker, Matías R Díaz, James S Jenkins, Claudia Aguilera-Gomez, Jon M Jenkins, Joseph D Twicken, Karen A Collins, Jack Lissauer, David J Armstrong, Vardan Adibekyan, David Barrado, Susana C C Barros, Matthew Battley, Daniel Bayliss, François Bouchy, Edward M Bryant, Benjamin F Cooke, Olivier D S Demangeon, Xavier Dumusque, Pedro Figueira, Helen Giles, Jorge Lillo-Box, Christophe Lovis, Louise D Nielsen, Francesco Pepe, Don Pollacco, Nuno C Santos, Sergio G Sousa, Stéphane Udry, Peter J Wheatley, Oliver Turner, Maxime Marmier, Damien Ségransan, George Ricker, David Latham, Sara Seager, Joshua N Winn, John F Kielkopf, Rhodes Hart, Geof Wingham, Eric L N Jensen, Krzysztof G Hełminiak, A Tokovinin, C Briceño, Carl Ziegler, Nicholas M Law, Andrew W Mann, Tansu Daylan, John P Doty, Natalia Guerrero, Patricia Boyd, Ian Crossfield, Robert L Morris, Christopher E Henze, Aaron Dean Chacon, HD 213885b: a transiting 1-d-period super-Earth with an Earth-like composition around a bright (V = 7.9) star unveiled by TESS, Monthly Notices of the Royal Astronomical Society, Volume 491, Issue 2, January 2020, Pages 2982–2999, https://doi.org/10.1093/mnras/stz3150