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Title:
K2-290: a warm Jupiter and a mini-Neptune in a triple-star system
Authors:
Hjorth, M.; Justesen, A. B.; Hirano, T.; Albrecht, S.; Gandolfi, D.; Dai, F.; Alonso, R.; Barragán, O.; Esposito, M.; Kuzuhara, M.; Lam, K. W. F.; Livingston, J. H.; Montanes-Rodriguez, P.; Narita, N.; Nowak, G.; Prieto-Arranz, J.; Redfield, S.; Rodler, F.; Van Eylen, V.; Winn, J. N.; Antoniciello, G.; Cabrera, J.; Cochran, W. D.; Csizmadia, Sz; de Leon, J.; Deeg, H.; Eigmüller, Ph; Endl, M.; Erikson, A.; Fridlund, M.; Grziwa, S.; Guenther, E.; Hatzes, A. P.; Heeren, P.; Hidalgo, D.; Korth, J.; Luque, R.; Nespral, D.; Palle, E.; Pätzold, M.; Persson, C. M.; Rauer, H.; Smith, A. M. S.; Trifonov, T.
Affiliation:
AA(Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark), AB(Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark 0000-0002-0174-2466), AC(Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan), AD(Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark), AE(Dipartimento di Fisica, Università di Torino, via P. Giuria 1, I-10125 Torino, Italy), AF(Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USA), AG(Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, E-38205 La Laguna, Spain), AH(Dipartimento di Fisica, Università di Torino, via P. Giuria 1, I-10125 Torino, Italy), AI(Thüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, Germany), AJ(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), AK(Zentrum für Astronomie und Astrophysik, Technische Universität Berlin, Hardenbergstr. 36, D-10623 Berlin, Germany), AL(Department of Astronomy, Graduate School of Science, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan 0000-0002-4881-3620), AM(Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, E-38205 La Laguna, Spain), AN(Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, E-38205 La Laguna, Spain; 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; Department of Astronomy, Graduate School of Science, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan), AO(Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, E-38205 La Laguna, Spain), AP(Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, E-38205 La Laguna, Spain), AQ(Astronomy Department and Van Vleck Observatory, Wesleyan University, Middletown, CT 06459, USA 0000-0003-3786-3486), AR(European Southern Observatory, Alonso de Córdova 3107, Vitacura, Casilla, 19001 Santiago de Chile, Chile), AS(Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USA), AT(Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USA), AU(Dipartimento di Fisica, Università di Torino, via P. Giuria 1, I-10125 Torino, Italy), AV(Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, D-12489 Berlin, Germany), AW(Department of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USA), AX(Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, D-12489 Berlin, Germany), AY(Department of Astronomy, Graduate School of Science, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan), AZ(Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, E-38205 La Laguna, Spain; Departamento de Astrofísica, Universidad de La Laguna, E-38206, Tenerife, Spain), BA(Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, D-12489 Berlin, Germany), BB(Department of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USA), BC(Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, D-12489 Berlin, Germany), BD(Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, SE-439 92 Onsala, Sweden; Leiden Observatory, Leiden University, NL-2333CA Leiden, the Netherlands), BE(Rheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Strasse 209, D-50931 Köln, Germany), BF(Thüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, Germany), BG(Thüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, Germany), BH(ZAH-Landessternwarte Heidelberg, Königstuhl 12, D-69117 Heidelberg, Germany), BI(Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, E-38205 La Laguna, Spain; Departamento de Astrofísica, Universidad de La Laguna, E-38206, Tenerife, Spain), BJ(Rheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Strasse 209, D-50931 Köln, Germany), BK(Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, E-38205 La Laguna, Spain; Departamento de Astrofísica, Universidad de La Laguna, E-38206, Tenerife, Spain 0000-0002-4671-2957), BL(Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, E-38205 La Laguna, Spain; Departamento de Astrofísica, Universidad de La Laguna, E-38206, Tenerife, Spain), BM(Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, E-38205 La Laguna, Spain; Departamento de Astrofísica, Universidad de La Laguna, E-38206, Tenerife, Spain), BN(Rheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Strasse 209, D-50931 Köln, Germany), BO(Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, SE-439 92 Onsala, Sweden), BP(Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, D-12489 Berlin, Germany; Institute of Geological Sciences, FU Berlin, Malteserstr. 74-100, D-12249 Berlin, Germany; Center for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36, D-10623 Berlin, Germany), BQ(Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, D-12489 Berlin, Germany), BR(Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 484, Issue 3, p.3522-3536 (MNRAS Homepage)
Publication Date:
04/2019
Origin:
OUP
Astronomy Keywords:
planets and satellites: detection, planets and satellites: formation, planets and satellites: individual: K2-290, planets and satellites: individual: EPIC 249624646
Abstract Copyright:
2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stz139
Bibliographic Code:
2019MNRAS.484.3522H

Abstract

We report the discovery of two transiting planets orbiting K2-290 (EPIC 249624646), a bright (V = 11.11) late F-type star residing in a triple-star system. It was observed during Campaign 15 of the K2 mission, and in order to confirm and characterize the system, follow-up spectroscopy and AO imaging were carried out using the FIES, HARPS, HARPS-N, and IRCS instruments. From AO imaging and Gaia data we identify two M-dwarf companions at a separation of 113 ± 2 and 2467_{-155}^{+177} au. From radial velocities, K2 photometry, and stellar characterization of the host star, we find the inner planet to be a mini-Neptune with a radius of 3.06 ± 0.16 R and an orbital period of P = 9.2 d. The radius of the mini-Neptune suggests that the planet is located above the radius valley, and with an incident flux of F ˜ 400 F, it lies safely outside the super-Earth desert. The outer warm Jupiter has a mass of 0.774 ± 0.047 MJ and a radius of 1.006 ± 0.050 RJ, and orbits the host star every 48.4 d on an orbit with an eccentricity e < 0.241. Its mild eccentricity and mini-Neptune sibling suggest that the warm Jupiter originates from in situ formation or disc migration.
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