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)

planets and satellites: detection

stars: individual (GJ 9827

Author

P. Niraula

Wesleyan University

S. Redfield

Wesleyan University

F. Dai

Massachusetts Institute of Technology (MIT)

Princeton University

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

Instituto Astrofisico de Canarias

University of La Laguna

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 - National Astronomical Observatory of Japan

National Institutes of Natural Sciences

University of Tokyo

D. Nespral

Instituto Astrofisico de Canarias

University of La Laguna

G. Nowak

Instituto Astrofisico de Canarias

University of La Laguna

M. Patzold

University of Cologne

E. Palle

University of La Laguna

Instituto Astrofisico de Canarias

V. Van Eylen

Leiden University

Astronomical Journal

0004-6256 (ISSN) 1538-3881 (eISSN)

Vol. 154 6 266- 266

Exoplanets from space – CHEOPS and PLATO, ESA’s next two projects

Swedish National Space Board, 2017-01-01 -- 2022-12-31.

Subject Categories

Astronomy, Astrophysics and Cosmology

Roots

Basic sciences

DOI

10.3847/1538-3881/aa957c

More information

Latest update

10/12/2018