Artículo
TOI-431/HIP 26013: A super-Earth and a sub-Neptune transiting a bright, early K dwarf, with a third RV planet
Osborn, Ares; Armstrong, David J; Cale, Bryson; Brahm, Rafael; Wittenmyer, Robert A; Dai, Fei; Crossfield, Ian J. M; Bryant, Edward M; Adibekyan, Vardan; Cloutier, Ryan; Collins, Karen A; Delgado Mena, E.; Fridlund, Malcolm; Hellier, Coel; Howell, Steve B; King, George W; Lillo Box, Jorge; Otegi, Jon; Sousa, S.; Stassun, Keivan G; Matthews, Elisabeth C; Ziegler, Carl; Ricker, George; Vanderspek, Roland; Latham, David W; Seager, S.; Winn, Joshua N.; Jenkins, Jon M; Acton, Jack S; Addison, Brett C; Diaz, Rodrigo Fernando
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Fecha de publicación:
10/2021
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Monthly Notices of the Royal Astronomical Society
ISSN:
0035-8711
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We present the bright (Vmag = 9.12), multiplanet system TOI-431, characterized with photometry and radial velocities (RVs). We estimate the stellar rotation period to be 30.5 ± 0.7 d using archival photometry and RVs. Transiting Exoplanet Survey Satellite (TESS) objects of Interest (TOI)-431 b is a super-Earth with a period of 0.49 d, a radius of 1.28 ± 0.04 R, a mass of 3.07 ± 0.35 M, and a density of 8.0 ± 1.0 g cm-3; TOI-431 d is a sub-Neptune with a period of 12.46 d, a radius of 3.29 ± 0.09 R, a mass of 9.90+1.53-1.49 M, and a density of 1.36 ± 0.25 g cm-3. We find a third planet, TOI-431 c, in the High Accuracy Radial velocity Planet Searcher RV data, but it is not seen to transit in the TESS light curves. It has an Msin i of 2.83+0.41-0.34 M, and a period of 4.85 d. TOI-431 d likely has an extended atmosphere and is one of the most well-suited TESS discoveries for atmospheric characterization, while the super-Earth TOI-431 b may be a stripped core. These planets straddle the radius gap, presenting an interesting case-study for atmospheric evolution, and TOI-431 b is a prime TESS discovery for the study of rocky planet phase curves.
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Articulos (ICIFI)
Articulos de INSTITUTO DE CIENCIAS FISICAS
Articulos de INSTITUTO DE CIENCIAS FISICAS
Citación
Osborn, Ares; Armstrong, David J; Cale, Bryson; Brahm, Rafael; Wittenmyer, Robert A; et al.; TOI-431/HIP 26013: A super-Earth and a sub-Neptune transiting a bright, early K dwarf, with a third RV planet; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 507; 2; 10-2021; 2782-2803
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