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Three planets transiting the evolved star EPIC 249893012: a hot 8.8-M⊕ super-Earth and two warm 14.7 and 10.2-M⊕ sub-Neptunes
Hidalgo, D. and Palle, E. and Alonso, R. and Gandolfi, D. and Fridlund, M. and Nowak, G. and Luque, R. and Hirano, T. and Justesen, A. B. and Cochran, W. D. and Barragán, O. and Spina, L. and Rodler, F. and Albrecht, S. and Anderson, D. R. and Amado, P. J. and Bryant, E. and Caballero, J. A. and Cabrera, J. and Csizmadia, Sz. and Dai, F. and De Leon, J. and Deeg, H. J. and Eigmueller, Ph. and Endl, M. and Erikson, A and Esposito, M. and Figueira, P. and Georgieva, I. and Grziwa, S. and Guenther, E. and Hatzes, A.P. and Hjorth, M. and Hoeijmakers, H.J. and Kabath, P. and Korth, J. and Kuzuhara, M. and Lafarga, M. and Lampon, M. and Leão, I.C. and Livingston, J. and Mathur, S. and Montanes-Rodriguez, P. and Morales, J.C. and Murgas, F. and Nagel, E. and Narita, N. and Nielsen, L.D. and Patzold, M. and Persson, C.M. and Prieto-Arranz, J. and Quirrenbach, A. and Rauer, H. and Redfield, S. and Reiners, A. and Ribas, I. and Smith, A.M.S. and Svubjak, J. and Van Eylen, V. and Wilson, P.A.
(2020)
Three planets transiting the evolved star EPIC 249893012: a hot 8.8-M⊕ super-Earth and two warm 14.7 and 10.2-M⊕ sub-Neptunes.
Astronomy & Astrophysics, 636, A89.
EDP Sciences.
doi: 10.1051/0004-6361/201937080.
ISSN 0004-6361.
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Official URL: https://www.aanda.org/articles/aa/abs/2020/04/aa37080-19/aa37080-19.html AbstractWe report the discovery of a new planetary system with three transiting planets, one super-Earth and two sub-Neptunes, that orbit EPIC 249893012, a G8 IV-V evolved star (M⋆ = 1.05 ± 0.05 M⊙, R⋆ = 1.71 ± 0.04 R⊙, Teff = 5430 ± 85 K). The star is just leaving the main sequence. We combined K2 photometry with IRCS adaptive-optics imaging and HARPS, HARPS-N, and CARMENES high-precision radial velocity measurements to confirm the planetary system, determine the stellar parameters, and measure radii, masses, and densities of the three planets. With an orbital period of 3.5949−0.0007+0.0007 days, a mass of 8.75−1.08+1.09 M⊕, and a radius of 1.95−0.08+0.09 R⊕, the inner planet b is compatible with nickel-iron core and a silicate mantle (ρb = 6.39−1.04+1.19 g cm−3). Planets c and d with orbital periods of 15.624−0.001+0.001 and 35.747−0.005+0.005 days, respectively, have masses and radii of 14.67−1.89+1,84 M⊕ and 3.67−0.14+0.17 R⊕ and 10.18−2.42+2.46 M⊕ and 3.94−0.12+0.13 R⊕, respectively, yielding a mean density of 1.62−0.29+0.30 and 0.91−0.23+0.25 g cm−3, respectively. The radius of planet b lies in the transition region between rocky and gaseous planets, but its density is consistent with a rocky composition. Its semimajor axis and the corresponding photoevaporation levels to which the planet has been exposed might explain its measured density today. In contrast, the densities and semimajor axes of planets c and d suggest a very thick atmosphere. The singularity of this system, which orbits a slightly evolved star that is just leaving the main sequence, makes it a good candidate for a deeper study from a dynamical point of view. Item URL in elib: | https://elib.dlr.de/137444/ |
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Document Type: | Article |
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Title: | Three planets transiting the evolved star EPIC 249893012: a hot 8.8-M⊕ super-Earth and two warm 14.7 and 10.2-M⊕ sub-Neptunes |
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Authors: | Authors | Institution or Email of Authors | Author's ORCID iD |
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Hidalgo, D. | Instituto de Astrofísica de Canarias (IAC), 38205 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna (ULL), 38206 La Laguna, Tenerife, Spain | https://orcid.org/0000-0002-7340-6963 | Palle, E. | Instituto de Astrofısica de Canarias (IAC), 38205 La Laguna, Tenerife, Spain | UNSPECIFIED | Alonso, R. | Instituto de Astrofisica de Canarias (IAC), Via Lactea s/n 38200, La Laguna, Spain | UNSPECIFIED | Gandolfi, D. | dipartimento di fisica, universitadi torino, via p. giuria 1, i-10125 torino, italy | UNSPECIFIED | Fridlund, M. | Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 439 92 Onsala, Sweden; Leiden Observatory, University of Leiden, PO Box 9513, 2300 RA Leiden, The Netherlands | UNSPECIFIED | Nowak, G. | Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, Spain | UNSPECIFIED | Luque, R. | Instituto de Astrofisica de Canarias, C/ Via Lactea s/n, 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, Tenerife, Spain | UNSPECIFIED | Hirano, T. | Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan | UNSPECIFIED | Justesen, A. B. | Stellar Astrophysics Centre, Deparment of Physics and Astron-omy, Aarhus University, Ny Munkegrade 120, 8000 Aarhus C,Denmark | UNSPECIFIED | Cochran, W. D. | Department of Astronomy and McDonald Observatory, Universityof Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712,USA | UNSPECIFIED | Barragán, O. | Sub-department of Astrophysics, Department of Physics, Universityof Oxford, Oxford OX1 3RH, UK | UNSPECIFIED | Spina, L. | Monash Centre for Astrophysics, School of Physics and Astronomy,Monash University, VIC 3800, Australia | UNSPECIFIED | Rodler, F. | Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA | UNSPECIFIED | Albrecht, S. | Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark | UNSPECIFIED | Anderson, D. R. | Department of Physics, University of Warwick, Gibbet Hill Road,Coventry, CV4 7AL, UK | UNSPECIFIED | Amado, P. J. | Instituto de Astrofisica de Andalucia (IAA-CSIC), Glorieta de la Astronomia s/n, 18008, Granada, Spain | UNSPECIFIED | Bryant, E. | Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK | UNSPECIFIED | Caballero, J. A. | Centro de Astrobiología (CSIC-INTA), ESAC, camino bajo delcastillo s/n, 28692 Villanueva de la Cañada, Madrid Spain | UNSPECIFIED | Cabrera, J. | nstitute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany | UNSPECIFIED | Csizmadia, Sz. | szilard.csizmadia (at) dlr.de | https://orcid.org/0000-0001-6803-9698 | Dai, F. | Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA | UNSPECIFIED | De Leon, J. | Department of Astronomy, Graduate School of Science, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan | UNSPECIFIED | Deeg, H. J. | Instituto de Astrofísica de Canarias (IAC), 38205 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna (ULL), 38206 La Laguna, Tenerife, Spain | UNSPECIFIED | Eigmueller, Ph. | philipp (at) eigmueller (at) dlr.de | UNSPECIFIED | Endl, M. | Department of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Austin, TX, 78712, USA | UNSPECIFIED | Erikson, A | anders.erikson (at) dlr.de | UNSPECIFIED | Esposito, M. | Thueringer Landessternwarte, Sternwarte 5, Tautenburg 5, D-07778 Tautenburg, Germany | UNSPECIFIED | Figueira, P. | European Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, Chile; Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal | UNSPECIFIED | Georgieva, I. | Department of Space, Earth and Environment, Onsala Space Observatory, Chalmers University of Technology, SE-439 92, Onsala, Sweden | UNSPECIFIED | Grziwa, S. | Rheinisches Institut fuer Umweltforschung an der Universitaet zu Koeln, Aachener Strasse 209, 50931 Koeln, Germany | UNSPECIFIED | Guenther, E. | Thueringer Landessternwarte, Sternwarte 5, Tautenburg 5, D-07778 Tautenburg, Germany | UNSPECIFIED | Hatzes, A.P. | Thueringer Landessternwarte, Sternwarte 5, Tautenburg 5, D-07778 Tautenburg, Germany | UNSPECIFIED | Hjorth, M. | Stellar Astrophysics Centre, Deparment of Physics and Astronomy, Aarhus University, Ny Munkegrade 120, 8000 Aarhus C, Denmark | UNSPECIFIED | Hoeijmakers, H.J. | Geneva Observatory, University of Geneva, Chemin des Mailettes51, 1290 Versoix, Switzerland | UNSPECIFIED | Kabath, P. | Astronomical Institute ASCR, Fricova 298, 25165 Ondrejov, Czech Republic | UNSPECIFIED | Korth, J. | Rheinisches Institut für Umweltforschung an der Universitaet zu Koeln | UNSPECIFIED | Kuzuhara, M. | National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan; Tokyo University of Agriculture and Technology, 3-8-1, Saiwai-cho, Fuchu, Tokyo 183-0054, Japan | UNSPECIFIED | Lafarga, M. | Institut de Ciencies de l'Espai (ICE, CSIC), C/Can Magrans, s/n, Campus UAB, 08193, Bellaterra, Spain; Institut d'Estudis Espacials de Catalunya (IEEC), 08034, Barcelona, Spain | UNSPECIFIED | Lampon, M. | Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de laAstronomía s/n, 18008 Granada, Spain | UNSPECIFIED | Leão, I.C. | Departamento de Física, Universidade Federal do Rio Grande doNorte, 59078-970 Natal, RN, Brazil | UNSPECIFIED | Livingston, J. | Department of Astronomy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan | UNSPECIFIED | Mathur, S. | Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, Spain | UNSPECIFIED | Montanes-Rodriguez, P. | Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain | Departamento de Astrofisica, Universidad de La Laguna, 38206 La Laguna, Spain | UNSPECIFIED | Morales, J.C. | Institut de Ciències de l’Espai (ICE, CSIC), Campus UAB, C/ deCan Magrans s/n, 08193 Bellaterra, Spain | UNSPECIFIED | Murgas, F. | Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, Spain | UNSPECIFIED | Nagel, E. | Hamburger Sternwarte, Gojenbergsweg 112, 21029, Hamburg, Germany | UNSPECIFIED | Narita, N. | Astrobiology Center and National Astronomical Observatory of Japan, NINS, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan; Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan; Institut | UNSPECIFIED | Nielsen, L.D. | Geneva Observatory, University of Geneva, Chemin des Mailettes51, 1290 Versoix, Switzerland | UNSPECIFIED | Patzold, M. | Rheinisches Institut fuer Umweltforschung an der Universitaet zu Koeln, Aachener Strasse 209, 50931 Koeln, Germany | UNSPECIFIED | Persson, C.M. | Department of Space, Earth and Environment, Chalmers Universityof Technology, Onsala Space Observatory, 439 92 Onsala, Sweden | UNSPECIFIED | Prieto-Arranz, J. | Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, Spain | UNSPECIFIED | Quirrenbach, A. | Landessternwarte, Zentrum fur Astronomie der Universtat Heidelberg, Konigstuhl 12, 69117, Heidelberg, Germany | UNSPECIFIED | Rauer, H. | heike.rauer (at) dlr.de | UNSPECIFIED | Redfield, S. | Astronomy Department and Van Vleck Observatory, Wesleyan University, Middletown, CT, 06459, USA | UNSPECIFIED | Reiners, A. | Institut fur Astrophysik, Georg-August-Universitat, Friedrich-Hund-Platz 1, 37077, Gottingen, Germany | UNSPECIFIED | Ribas, I. | Institut de Ciencies de l' Espai (ICE, CSIC), C/Can Magrans, s/n, Campus UAB, 08193, Bellaterra, Spain; Institut d'Estudis Espacials de Catalunya (IEEC), 08034, Barcelona, Spain | UNSPECIFIED | Smith, A.M.S. | alexis.smith (at) dlr.de | UNSPECIFIED | Svubjak, J. | Astronomical Institute of the Czech Academy of Sciences, Friˇcova298, 25165 Ondˇrejov, Czech Republic | UNSPECIFIED | Van Eylen, V. | Mullard Space Science Laboratory, University College London,Holmbury St Mary, Dorking, Surrey RH5 6NT, UK | UNSPECIFIED | Wilson, P.A. | entre for Exoplanets and Habitability, University of Warwick,Gibbet Hill Road, Coventry, CV4 7AL, UK | UNSPECIFIED |
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Date: | April 2020 |
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Journal or Publication Title: | Astronomy & Astrophysics |
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Refereed publication: | Yes |
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Open Access: | Yes |
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Gold Open Access: | No |
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In SCOPUS: | Yes |
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In ISI Web of Science: | Yes |
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Volume: | 636 |
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DOI
: | 10.1051/0004-6361/201937080 |
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Page Range: | A89 |
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Publisher: | EDP Sciences |
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ISSN: | 0004-6361 |
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Status: | Published |
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Keywords: | planetary systems, planets and satellites: detection, techniques: photometric, techniques: radial velocities, planets and satellites: fundamental parameters, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics |
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HGF - Research field: | Aeronautics, Space and Transport |
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HGF - Program: | Space |
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HGF - Program Themes: | Space Exploration |
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DLR - Research area: | Raumfahrt |
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DLR - Program: | R EW - Space Exploration |
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DLR - Research theme (Project): | R - Project PLATO (old) |
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Location: |
Berlin-Adlershof
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Institutes and Institutions: | Institute of Planetary Research > Extrasolar Planets and Atmospheres Institute of Planetary Research > Leitungsbereich PF |
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Deposited By: |
Csizmadia, Szilard
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Deposited On: | 12 Nov 2020 08:52 |
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Last Modified: | 12 Nov 2020 08:52 |
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