Orangish-hued star in the constellation Virgo
K2-19 is anearly K-type [ 4] late G-type main sequence star[ 5] light curve that exhibits variations in brightness of ~1%.[ 5] light-years away in the constellationVirgo . Three confirmedtransiting exoplanets are known to orbit this star.
The two outer planets were reported as planet candidates during analysis of data from Campaign 1 of theKepler space telescope 's K2 extended mission.[ 11] transit-timing variations for K2-19b.[ 7] [ 12]
K2-19d was first reported as a planet candidate during a search for candidates from the first year of the K2 Mission[ 13] [ 5]
K2-19 has a planetary system with three known planets, of which the two larger ones, K2-19b and K2-19c, are either close to the 3:2mean motion resonance or inside it.[ 14] [ 15] Mercury does to theSun .[ 4] [ 16]
^ Roman, Nancy G. (1987)."Identification of a constellation from a position" .Publications of the Astronomical Society of the Pacific 99 (617): 695.Bibcode :1987PASP...99..695R .doi :10.1086/132034 Constellation record for this object atVizieR .^a b c d e Brown, A. G. A. ; et al. (Gaia collaboration) (2021)."Gaia Early Data Release 3: Summary of the contents and survey properties" .Astronomy & Astrophysics 649 : A1.arXiv :2012.01533 Bibcode :2021A&A...649A...1G .doi :10.1051/0004-6361/202039657 S2CID 227254300 . (Erratum: doi :10.1051/0004-6361/202039657e ) . Gaia EDR3 record for this source atVizieR .^a b Henden, A. A.; et al. (2016). "VizieR Online Data Catalog: AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)".VizieR On-line Data Catalog: II/336. Originally Published in: 2015AAS...22533616H .2336 .Bibcode :2016yCat.2336....0H . Vizier catalog entry ^a b c d Nespral, D.; et al. (2017)."Mass determination of K2-19b and K2-19c from radial velocities and transit timing variations" .Astronomy and Astrophysics .601 A128.arXiv :1604.01265 Bibcode :2017A&A...601A.128N doi :10.1051/0004-6361/201628639 S2CID 55978628 . ^a b c d Sinukoff, Evan; et al. (2016)."Eleven Multiplanet Systems From K2 Campaigns 1 and 2 and the Masses of Two Hot Super-Earths" .The Astrophysical Journal .827 (1) 78.arXiv :1511.09213 Bibcode :2016ApJ...827...78S doi :10.3847/0004-637X/827/1/78 ^a b c Skrutskie, Michael F.; et al. (1 February 2006)."The Two Micron All Sky Survey (2MASS)" .The Astronomical Journal .131 (2):1163– 1183.Bibcode :2006AJ....131.1163S doi :10.1086/498708 Vizier catalog entry ^a b Armstrong, David J.; et al. (2015)."One of the closest exoplanet pairs to the 3:2 mean motion resonance: K2-19b and c" .Astronomy and Astrophysics .582 A33.arXiv :1503.00692 Bibcode :2015A&A...582A..33A doi :10.1051/0004-6361/201526008 S2CID 8463154 . ^a b Barros, S. C. C.; et al. (2015)."Photodynamical mass determination of the multiplanetary system K2-19" .Monthly Notices of the Royal Astronomical Society .454 (4):4267– 4276.arXiv :1510.01047 Bibcode :2015MNRAS.454.4267B doi :10.1093/mnras/stv2271 ^ Narita, Norio; et al. (2015)."Characterization of the K2-19 Multiple-transiting Planetary System via High-dispersion Spectroscopy, AO Imaging, and Transit Timing Variations" .The Astrophysical Journal .815 (1) 47.arXiv :1510.01060 Bibcode :2015ApJ...815...47N doi :10.1088/0004-637X/815/1/47 ^ "K2-19" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2018-12-31 .^ Foreman-Mackey, Daniel; et al. (2015)."A Systematic Search for Transiting Planets in the K2 Data" .The Astrophysical Journal .806 (2) 215.arXiv :1502.04715 Bibcode :2015ApJ...806..215F doi :10.1088/0004-637X/806/2/215 ^ Montet, Benjamin T.; et al. (2015)."Stellar and Planetary Properties of K2 Campaign 1 Candidates and Validation of 17 Planets, Including a Planet Receiving Earth-like Insolation" .The Astrophysical Journal .809 (1) 25.arXiv :1503.07866 Bibcode :2015ApJ...809...25M doi :10.1088/0004-637X/809/1/25 ^ Vanderburg, Andrew; et al. (2016)."Planetary Candidates from the First Year of the K2 Mission" .The Astrophysical Journal Supplement Series .222 (1) 14.arXiv :1511.07820 Bibcode :2016ApJS..222...14V doi :10.3847/0067-0049/222/1/14 ^a b Petigura, Erik A.; et al. (January 2020)."K2-19b and c are in a 3:2 Commensurability but out of Resonance: A Challenge to Planet Assembly by Convergent Migration" .The Astronomical Journal .159 (1) 2.arXiv :1910.12899 Bibcode :2020AJ....159....2P doi :10.3847/1538-3881/ab5220 ^ Petit, Antoine C; Petigura, Erik A; Davies, Melvyn B; Johansen, Anders (2020-08-11)."Resonance in the K2-19 system is at odds with its high reported eccentricities" .Monthly Notices of the Royal Astronomical Society .496 (3):3101– 3111.arXiv :2003.04931 Bibcode :2020MNRAS.496.3101P doi :10.1093/mnras/staa1736 ^ Williams, David R. (2018-09-27)."Mercury Fact Sheet" . NASA. Retrieved2019-01-12 . ^ Kokori, A.; et al. (14 February 2023)."ExoClock Project. III. 450 New Exoplanet Ephemerides from Ground and Space Observations" .The Astrophysical Journal Supplement Series .265 (1) 4.arXiv :2209.09673 Bibcode :2023ApJS..265....4K doi :10.3847/1538-4365/ac9da4
