Livingston, John H., Dai, Fei, Hirano, Teruyuki, Gandolfi, Davide ORCID: 0000-0001-8627-9628, Trani, Alessandro A., Nowak, Grzegorz, Cochran, William D., Endl, Michael, Albrecht, Simon, Barragan, Oscar ORCID: 0000-0003-0563-0493, Cabrera, Juan ORCID: 0000-0001-6653-5487, Csizmadia, Szilard, de Leon, Jerome P., Deeg, Hans, Eigmueller, Philipp, Erikson, Anders, Fridlund, Malcolm ORCID: 0000-0002-0855-8426, Fukui, Akihiko, Grziwa, Sascha, Guenther, Eike W., Hatzes, Artie P., Korth, Judith ORCID: 0000-0002-0076-6239, Kuzuhara, Masayuki, Montanes, Pilar, Narita, Norio, Nespral, David, Palle, Enric, Paetzold, Martin, Persson, Carina M., Prieto-Arranz, Jorge, Rauer, Heike, Tamura, Motohide, Van Eylen, Vincent ORCID: 0000-0001-5542-8870 and Winn, Joshua N. (2019). K2-264: a transiting multiplanet system in the Praesepe open cluster. Mon. Not. Roy. Astron. Soc., 484 (1). S. 8 - 19. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

Planet host stars with well-constrained ages provide a rare window to the time domain of planet formation and evolution. The NASA K2 mission has enabled the discovery of the vast majority of known planets transiting stars in clusters, providing a valuable sample of planets with known ages and radii. We present the discovery of two planets transiting K2-264, an M2 dwarf in the intermediate age (600-800 Myr) Praesepe open cluster (also known as the Beehive Cluster, M44, or NGC 2632), which was observed by K2 during Campaign 16. The planets have orbital periods of 5.8 and 19.7 d, and radii of 2.2 +/- 0.2 and 2.7 +/- 0.2R(circle plus), respectively, and their equilibrium temperatures are 496 +/- 10 and 331 +/- 7 K, making this a system of two warm sub-Neptunes. When placed in the context of known planets orbiting field stars of similar mass to K2-264, these planets do not appear to have significantly inflated radii, as has previously been noted for some cluster planets. As the second known system of multiple planets transiting a star in a cluster, K2-264 should be valuable for testing theories of photoevaporation in systems of multiple planets. Follow-up observations with current near-infrared (NIR) spectrographs could yield planet mass measurements, which would provide information about the mean densities and compositions of small planets soon after photoevaporation is expected to have finished. Follow-up NIR transit observations using Spitzer or large ground-based telescopes could yield improved radius estimates, further enhancing the characterization of these interesting planets.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Livingston, John H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dai, FeiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hirano, TeruyukiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gandolfi, DavideUNSPECIFIEDorcid.org/0000-0001-8627-9628UNSPECIFIED
Trani, Alessandro A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nowak, GrzegorzUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cochran, William D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Endl, MichaelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Albrecht, SimonUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barragan, OscarUNSPECIFIEDorcid.org/0000-0003-0563-0493UNSPECIFIED
Cabrera, JuanUNSPECIFIEDorcid.org/0000-0001-6653-5487UNSPECIFIED
Csizmadia, SzilardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
de Leon, Jerome P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deeg, HansUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eigmueller, PhilippUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Erikson, AndersUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fridlund, MalcolmUNSPECIFIEDorcid.org/0000-0002-0855-8426UNSPECIFIED
Fukui, AkihikoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grziwa, SaschaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guenther, Eike W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hatzes, Artie P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Korth, JudithUNSPECIFIEDorcid.org/0000-0002-0076-6239UNSPECIFIED
Kuzuhara, MasayukiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Montanes, PilarUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Narita, NorioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nespral, DavidUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Palle, EnricUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Paetzold, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Persson, Carina M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Prieto-Arranz, JorgeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rauer, HeikeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tamura, MotohideUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Van Eylen, VincentUNSPECIFIEDorcid.org/0000-0001-5542-8870UNSPECIFIED
Winn, Joshua N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-155147
DOI: 10.1093/mnras/sty3464
Journal or Publication Title: Mon. Not. Roy. Astron. Soc.
Volume: 484
Number: 1
Page Range: S. 8 - 19
Date: 2019
Publisher: OXFORD UNIV PRESS
Place of Publication: OXFORD
ISSN: 1365-2966
Language: English
Faculty: Faculty of Mathematics and Natural Sciences
Divisions: Externe Einrichtungen > An-Institute > Associated Institutes of the Faculty of Mathematics and Natural Sciences > Rhenish Institute for Environmental Research - RIU
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
LOW-MASS STARS; EVOLUTIONARY TRACKS; PLANETARY SYSTEMS; ISOCHRONES; EXOPLANETS; STABILITY; COMPANION; SEARCH; DEEPMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/15514

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