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K2-140b and K2-180b - Characterization of a hot Jupiter and a mini-Neptune from the K2 mission

Korth, J. and Csizmadia, Szilard and Gandolfi, D. and Fridlund, M and Patzold, M and Hirano, T. and Livingston, J. and Persson, C. and Deeg, H and Justesen, A. and Barragan, O. and Grziwa, S and Endl, M and Tronsgaard, R. and Dai, F. and Cochran, W. D. and Albrecht, S. and Alonso, R. and Cabrera Perez, Juan and Cauley, P.Wilson and Cusano, F. and Eigmüller, Philipp and Erikson, A and Esposito, M. and Guenther, E. and Hatzes, A. and Hidalgo, D. and Kuzuhara, M. and Montanes Rodriguez, P. and Napolitano, N.R. and Narita, N. and Niraula, P. and Nespral, D. and Nowak, G. and Palle, E. and Petrillo, C.E. and Redfield, S. and Prieto-Arranz, J. and Rauer, H and Smith, Alexis and Tortora, C. and Van Eylen, V. and Winn, J. N. (2019) K2-140b and K2-180b - Characterization of a hot Jupiter and a mini-Neptune from the K2 mission. Monthly Notices of the Royal Astronomical Society, 482 (2), pp. 1807-1823. Oxford University Press. DOI: 10.1093/mnras/sty2760 ISSN 0035-8711

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Abstract

We report the independent discovery and characterization of two K2 planets: K2-180b, a mini-Neptune-sized planet in an 8.9-d orbit transiting a V = 12.6 mag, metal-poor ([Fe/H] = -0.65 ± 0.10) K2V star in K2 campaign 5; K2-140b, a transiting hot Jupiter in a 6.6-d orbit around a V = 12.6 mag G6V ([Fe/H] = + 0.10 ± 0.10) star in K2 campaign 10. Our results are based on K2 time-series photometry combined with high-spatial resolution imaging and high-precision radial velocity measurements. We present the first mass measurement of K2-180b. K2-180b has a mass of Mp = 11.3 ± 1.9 M_{\oplus} and a radius of Rp = 2.2 ± 0.1 R_{\oplus}, yielding a mean density of ρp = 5.6 ± 1.9 g cm-3, suggesting a rocky composition. Given its radius, K2-180b is above the region of the so-called `planetary radius gap'. K2-180b is in addition not only one of the densest mini-Neptune-sized planets, but also one of the few mini-Neptune-sized planets known to transit a metal-poor star. We also constrain the planetary and orbital parameters of K2-140b and show that, given the currently available Doppler measurements, the eccentricity is consistent with zero, contrary to the results of a previous study.

Item URL in elib:https://elib.dlr.de/131557/
Document Type:Article
Title:K2-140b and K2-180b - Characterization of a hot Jupiter and a mini-Neptune from the K2 mission
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Korth, J.Rheinisches Institut für Umweltforschung an der Universitaet zu Koeln, Aachener Strasse 209, D-50931 Koeln, GermanyUNSPECIFIED
Csizmadia, Szilardszilard.csizmadia (at) dlr.deUNSPECIFIED
Gandolfi, D.Dipartimento di Fisica, Universita di Torino, Via P. Giuria 1, 10125, Torino, ItalyUNSPECIFIED
Fridlund, MLeiden Observatory, University of Leiden, PO Box 9513, 2300 RA,UNSPECIFIED
Patzold, MRheinisches Institut fur Umweltforschung, Abteilung Planetenforschung an der Universitat zu Koln, Aachener Strasse 209, 50931 Koln, GermanyUNSPECIFIED
Hirano, T.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, JapanUNSPECIFIED
Livingston, J.Department of Astronomy, The University of Tokyo, 7-3-1 Bunkyo-ku, Tokyo 113-0033, JapanUNSPECIFIED
Persson, C.Department of Earth and Space Sciences, Chalmers University of Technology, Onsala Space Observatory, SE-439 92 Onsala, SwedenUNSPECIFIED
Deeg, HIstituto Astrofisica de CanariasUNSPECIFIED
Justesen, A.Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, DenmarkUNSPECIFIED
Barragan, O.Dipartimento di Fisica, Universita di TorinoUNSPECIFIED
Grziwa, SRheinisches Institut für Umweltforschung an der Universität zuUNSPECIFIED
Endl, MDepartment of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USAUNSPECIFIED
Tronsgaard, R.Nordic Optical Telescope, Rambla Jos´e Ana Fern´andez P´erez 7, 38711 Bre~na Baja, SpainUNSPECIFIED
Dai, F.Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USAUNSPECIFIED
Cochran, W. D.Department of Astronomy and McDonald Observatory, Universityof Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USAUNSPECIFIED
Albrecht, S.Stellar Astrophysics Centre, Deparment of Physics and Astronomy, Aarhus University, Ny Munkegrade 120, 8000 Aarhus C, DenmarkUNSPECIFIED
Alonso, R.Instituto de Astrofisica de Canarias, E-38205 La Laguna, Tenerife, SpainUNSPECIFIED
Cabrera Perez, JuanJuan.Cabrera (at) dlr.dehttps://orcid.org/0000-0001-6653-5487
Cauley, P.WilsonSchool of Earth and Space Exploration, Arizona State University, Tempe, AZ 85281, USAUNSPECIFIED
Cusano, F.INAF-Osservatorio Astronomico di Bologna, Via Ranzani 1, I-40127 Bologna, ItalyUNSPECIFIED
Eigmüller, PhilippPhilipp.Eigmueller (at) dlr.dehttps://orcid.org/0000-0003-4096-0594
Erikson, Aanders.erikson (at) dlr.deUNSPECIFIED
Esposito, M.Thuringer Landessternwarte Tautenburg, Sternwarte 5, 07778, Tautenburg, GermanyUNSPECIFIED
Guenther, E.Thueringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, GermanyUNSPECIFIED
Hatzes, A.Thueringer Landessternwarte, Sternwarte 5, Tautenburg 5, D-07778 Tautenburg, GermanyUNSPECIFIED
Hidalgo, D.Instituto de Astrof´ısica de Canarias, E-38205 La Laguna, Tenerife, SpainUNSPECIFIED
Kuzuhara, M.Astrobiology Center, NINS, 2-21-1 Osawa, Mitaka, Tokyo 181-UNSPECIFIED
Montanes Rodriguez, P.Instituto de Astrofisica de Canarias, C/ Via Lactea s/n, 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, Tenerife, SpainUNSPECIFIED
Napolitano, N.R.INAF - Osservatorio Astronomico di Capodimonte, Salita Moiariello, 16, I-80131 Napoli, ItalyUNSPECIFIED
Narita, N.Astrobiology Center, NINS, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan; National Astronomical Observatory of Japan, NINS, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan; Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, SpainUNSPECIFIED
Niraula, P.Department of Earth, Atmospheric and Planetary Sciences, MIT, 77 Massachusetts Avenue, Cambridge, MA, 02139, USAUNSPECIFIED
Nespral, D.Instituto de Astrofísica de Canarias (IAC), 38205 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna (ULL), 38206 La Laguna, Tenerife, SpainUNSPECIFIED
Nowak, G.Instituto de Astrofísica de Canarias (IAC), 38205 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna (ULL), 38206 La Laguna, Tenerife, SpainUNSPECIFIED
Palle, E.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain );; Departamento de Astrofisica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Petrillo, C.E.Kapteyn Astronomical Institute, University of Groningen, Postbus 800, 9700 AV, Groningen, The NetherlandsUNSPECIFIED
Redfield, S.Astronomy Department and Van Vleck Observatory, Wesleyan University, Middletown, CT, 06459, USAUNSPECIFIED
Prieto-Arranz, J.instituto de astrofísica de canarias, 38205 la laguna, tenerife, spain | departamento de astrofisica, universidad de la laguna, 38206 la laguna, spainUNSPECIFIED
Rauer, Hheike.rauer (at) dlr.deUNSPECIFIED
Smith, AlexisAlexis.Smith (at) dlr.deUNSPECIFIED
Tortora, C.Kapteyn Astronomical Institute, University of Groningen, Postbus 800, 9700 AV, Groningen, The NetherlandsUNSPECIFIED
Van Eylen, V.Leiden University, The NetherlandsUNSPECIFIED
Winn, J. N.Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ, 08544, USA)UNSPECIFIED
Date:2019
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:482
DOI :10.1093/mnras/sty2760
Page Range:pp. 1807-1823
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:techniques: photometric; techniques: radial velocities; stars: individual: K2-140; stars: individual: K2-180; planets and satellites: fundamental parameters; stars: fundamental parameters; Astrophysics - Earth and Planetary Astrophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt COROT Beteiligung
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Smith, Dr Alexis M S
Deposited On:29 Nov 2019 11:06
Last Modified:20 Mar 2020 11:58

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