Three Super-Earths Transiting the Nearby Star GJ 9827
Journal article, 2017
We report on the discovery of three transiting planets around GJ 9827. The planets have radii of 1.75 ± 0.18, 1.36 ± 0.14, and 2.11_-0.21^+0.22 R⊕, and periods of 1.20896, 3.6480, and 6.2014 days, respectively. The detection was made in Campaign 12 observations as part of our K2 survey of nearby stars. GJ 9827 is a V = 10.39 mag K6V star at a distance of 30.3 ± 1.6 parsecs and the nearest star to be found hosting planets by Kepler and K2. The radial velocity follow-up, high-resolution imaging, and detection of multiple transiting objects near commensurability drastically reduce the false positive probability. The orbital periods of GJ 9827 b, c, and d planets are very close to the 1:3:5 mean motion resonance. Our preliminary analysis shows that GJ 9827 planets are excellent candidates for atmospheric observations. Besides, the planetary radii span both sides of the rocky and gaseous divide, hence the system will be an asset in expanding our understanding of the threshold.
K2-135)
stars: individual (GJ 9827
planets and satellites: detection
Author
P. Niraula
Wesleyan University
S. Redfield
Wesleyan University
F. Dai
Princeton University
Massachusetts Institute of Technology (MIT)
O. Barragán
University of Turin
D. Gandolfi
University of Turin
P.W. Cauley
Wesleyan University
T. Hirano
Tokyo Institute of Technology
J. Korth
University of Cologne
A. M S Smith
German Aerospace Center (DLR)
J. Prieto-Arranz
University of La Laguna
Instituto de Astrofísica de Canarias
S. Grziwa
University of Cologne
Malcolm Fridlund
Astronomy and Plasmaphysics
Carina Persson
Astronomy and Plasmaphysics
A.B. Justesen
Aarhus University
J.N. Winn
Princeton University
S. Albrecht
Aarhus University
William D. Cochran
The University of Texas at Austin
S. Csizmadia
German Aerospace Center (DLR)
G.M. Duvvuri
Wesleyan University
M. Endl
The University of Texas at Austin
Artie P. Hatzes
Thüringer Landessternwarte Tautenburg
J.H. Livingston
University of Tokyo
N. Narita
National Institutes of Natural Sciences
University of Tokyo
National Astronomical Observatory of Japan
D. Nespral
University of La Laguna
Instituto de Astrofísica de Canarias
G. Nowak
University of La Laguna
Instituto de Astrofísica de Canarias
M. Patzold
University of Cologne
E. Palle
Instituto de Astrofísica de Canarias
University of La Laguna
V. Van Eylen
Leiden University
Astronomical Journal
0004-6256 (ISSN) 1538-3881 (eISSN)
Vol. 154 6 266- 266Exoplanets from space – CHEOPS and PLATO, ESA’s next two projects
Swedish National Space Board (174/18), 2017-01-01 -- 2022-12-31.
Subject Categories
Astronomy, Astrophysics and Cosmology
Roots
Basic sciences
DOI
10.3847/1538-3881/aa957c