@article{f65af078bed2423a83704a6d1765548d,
title = "Three Super-Earths Transiting the Nearby Star GJ 9827",
abstract = "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.",
keywords = "planets and satellites: detection, stars: individual (GJ 9827, K2-135)",
author = "Prajwal Niraula and Seth Redfield and Fei Dai and Oscar Barrag{\'a}n and Davide Gandolfi and Cauley, {P. Wilson} and Teruyuki Hirano and Judith Korth and Smith, {Alexis M.S.} and Jorge Prieto-Arranz and Sascha Grziwa and Malcolm Fridlund and Persson, {Carina M.} and Justesen, {Anders Bo} and Winn, {Joshua N.} and Simon Albrecht and Cochran, {William D.} and Szilard Csizmadia and Duvvuri, {Girish M.} and Michael Endl and Hatzes, {Artie P.} and Livingston, {John H.} and Norio Narita and David Nespral and Grzegorz Nowak and Martin Patzold and Enric Palle and {Van Eylen}, Vincent",
note = "Funding Information: We are extremely grateful to the NOT staff members for their unique and superb support during the observations. The research leading to these results has received funding from the European Union Seventh Framework Programme (FP7/ 2013–2016) under grant agreement No. 312430 (OPTICON). Based on observations obtained with the Nordic Optical Telescope (NOT), operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos (ORM) of the Instituto de Astrof{\'i}sica de Canarias (IAC). This paper includes data taken by Kepler. Funding for the Kepler mission is provided by the NASA Science Mission directorate through grant 14-K2G01_2-0071, submitted in response to NNH14ZDA001N Research Opportunities in Space and Earth Science (ROSES-2014). S. Redfield and P. W. Cauley acknowledge the support from the National Science Foundation through Astronomy and Astrophysics Research Grant AST-1313268. D. Gandolfi acknowledges the financial support of the Programma Giovani Ricercatori—Rita Levi Montalcini— Rientro dei Cervelli (2012) awarded by the Italian Ministry of Education, Universities and Research (MIUR). T. Hirano acknowledges support from JSPS KAKENHI Grant Number 16K17660. S. Albrecht and A. B. Justesen acknowledge support by the Danish Council for Independent Research, through a DFF Sapere Aude Starting Grant nr. 4181-00487B.",
year = "2017",
month = dec,
doi = "10.3847/1538-3881/aa957c",
language = "English (US)",
volume = "154",
journal = "Astronomical Journal",
issn = "0004-6256",
publisher = "American Astronomical Society",
number = "6",
}