| Full text | |
| Author(s): |
Bedell, Megan
;
Bean, Jacob L.
;
Melendez, Jorge
;
Mills, Sean M.
;
Fabrycky, Daniel C.
;
Freitas, Fabrcio C.
;
Ramirez, Ivan
;
Asplund, Martin
;
Liu, Fan
;
Yong, David
Total Authors: 10
|
| Document type: | Journal article |
| Source: | ASTROPHYSICAL JOURNAL; v. 839, n. 2 APR 20 2017. |
| Web of Science Citations: | 6 |
| Abstract | |
The six planets of the Kepler-11 system are the archetypal example of a population of surprisingly low-density transiting planets revealed by the Kepler mission. We have determined the fundamental parameters and chemical composition of the Kepler-11 host star to unprecedented precision using an extremely high-quality spectrum from Keck-HIRES (R similar or equal to 67,000, S/N per pixel similar or equal to 260 at 600 nm). Contrary to previously published results, our spectroscopic constraints indicate that Kepler-11 is a young main-sequence solar twin. The revised stellar parameters and new analysis raise the densities of the Kepler-11 planets by between 20% and 95% per planet, making them more typical of the emerging class of ``puffy{''} close-in exoplanets. We obtain photospheric abundances of 22 elements and find that Kepler-11 has an abundance pattern similar to that of the Sun with a slightly higher overall metallicity. We additionally analyze the Kepler light curves using a photodynamical model and discuss the tension between spectroscopic and transit/TTV-based estimates of stellar density. (AU) | |
| FAPESP's process: | 12/24392-2 - High precision spectroscopy: impact in the study of planets, stars, the galaxy and cosmology |
| Grantee: | Jorge Luis Melendez Moreno |
| Support Opportunities: | Research Projects - Thematic Grants |