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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
- Source :
- Espinoza, Néstor; Brahm, Rafael; Henning, Thomas; Jordán, Andrés; Dorn, Caroline; Rojas, Felipe; Sarkis, Paula; Kossakowski, Diana; Schlecker, Martin; Díaz, Matías R; Jenkins, James S; Aguilera-Gomez, Claudia; Jenkins, Jon M; Twicken, Joseph D; Collins, Karen A; Lissauer, Jack; Armstrong, David J; Adibekyan, Vardan; Barrado, David; Barros, Susana C C; Battley, Matthew; Bayliss, Daniel; Bouchy, François; Bryant, Edward M; Cooke, Benjamin F; Demangeon, Olivier D S; Dumusque, Xavier; Figueira, Pedro; Giles, Helen; Lillo-Box, Jorge; et al (2020). 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, 491(2):2982-2999.
- Publication Year :
- 2020
-
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.
Details
- Database :
- OAIster
- Journal :
- Espinoza, Néstor; Brahm, Rafael; Henning, Thomas; Jordán, Andrés; Dorn, Caroline; Rojas, Felipe; Sarkis, Paula; Kossakowski, Diana; Schlecker, Martin; Díaz, Matías R; Jenkins, James S; Aguilera-Gomez, Claudia; Jenkins, Jon M; Twicken, Joseph D; Collins, Karen A; Lissauer, Jack; Armstrong, David J; Adibekyan, Vardan; Barrado, David; Barros, Susana C C; Battley, Matthew; Bayliss, Daniel; Bouchy, François; Bryant, Edward M; Cooke, Benjamin F; Demangeon, Olivier D S; Dumusque, Xavier; Figueira, Pedro; Giles, Helen; Lillo-Box, Jorge; et al (2020). 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, 491(2):2982-2999.
- Notes :
- application/pdf, info:doi/10.5167/uzh-193880, English
- Publication Type :
- Electronic Resource
- Accession number :
- edsoai.on1443033971
- Document Type :
- Electronic Resource