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The Discovery and Mass Measurement of a New Ultra-short-period Planet: K2-131

F. Dai ; N. Joshua ; D. Gandolfi ; S. Wangm ; J.K. Teske ; J. Burt ; S. Albrecht ; O. Barragán ; W.D. Cochran ; M. Endl ; Malcolm Fridlund (Institutionen för rymd-, geo- och miljövetenskap, Astronomi och plasmafysik) ; A.P. Hatzes ; T. Hirano ; L.A. Hirsch ; M.C. Johnson ; A.B. Justesen ; J. Livingston ; Carina M. Persson (Institutionen för rymd-, geo- och miljövetenskap, Astronomi och plasmafysik) ; J. Prieto-Arranz ; A. Vanderburg ; R. Alonso ; G. Antoniciello ; P. Arriagada ; R.P. Butler ; J. Cabrera ; J.D. Crane ; F. Cusano ; S. Csizmadia ; H. Deeg ; S.B. Dieterich ; P. Eigmüller ; A. Erikson ; M.E. Everett ; Fukui A. ; S. Grziwa ; E.W. Guenther ; G.W. Henry ; S.B. Howell ; J.A. Johnson ; J. Korth ; M. Kuzuhara ; N. Narita ; D. Nespral ; G. Nowak ; E. Palle ; M. Pätzold ; H. Rauer ; P. Montanés Rodríguez ; S.A. Shectman ; A.M.S. Smith ; I.B. Thompson ; V. Van Eylen ; M.W. Williamson ; R.A. Wittenmyer
Astronomical Journal (0004-6256). Vol. 154 (2017), 6, p. 226.
[Artikel, refereegranskad vetenskaplig]

We report the discovery of a new ultra-short-period planet and summarize the properties of all such planets for which the mass and radius have been measured. The new planet, EPIC 228732031b, was discovered in K2 Campaign 10. It has a radius of 1.81-0.12+0.16 R_Earth and orbits a G dwarf with a period of 8.9 hr. Radial velocities obtained with Magellan/PFS and TNG/HARPS-N show evidence for stellar activity along with orbital motion. We determined the planetary mass using two different methods: (1) the “floating chunk offset” method, based only on changes in velocity observed on the same night; and (2) a Gaussian process regression based on both the radial velocity and photometric time series. The results are consistent and lead to a mass measurement of 6.5+/- 1.6 M_Earth and a mean density of 6.0-2.7+3.0 g cm‑3.

Nyckelord: planetary systems, stars: individual: EPIC 228732031



Denna post skapades 2017-11-22. Senast ändrad 2017-12-13.
CPL Pubid: 253325

 

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