Publikationsdatum:
2016-11-10
Beschreibung:
We report the discovery from K2 of a transiting planet in an 18.25-d, eccentric (0.19 ± 0.04) orbit around K2-99, an 11th magnitude subgiant in Virgo. We confirm the planetary nature of the companion with radial velocities, and determine that the star is a metal-rich ([Fe/H] = 0.20 ± 0.05) subgiant, with mass $1.60^{+0.14}_{-0.10}$ M and radius 3.1 ± 0.1 R . The planet has a mass of 0.97 ± 0.09 M Jup and a radius 1.29 ± 0.05 R Jup . A measured systemic radial acceleration of –2.12 ± 0.04 ms –1 d –1 offers compelling evidence for the existence of a third body in the system, perhaps a brown dwarf orbiting with a period of several hundred days.
Print ISSN:
0035-8711
Digitale ISSN:
1365-2966
Thema:
Physik
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