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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

Abstract

We 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/
Document Type:Article
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
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
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, Spainhttps://orcid.org/0000-0002-7340-6963
Palle, E.Instituto de Astrofısica de Canarias (IAC), 38205 La Laguna, Tenerife, SpainUNSPECIFIED
Alonso, R.Instituto de Astrofisica de Canarias (IAC), Via Lactea s/n 38200, La Laguna, SpainUNSPECIFIED
Gandolfi, D.dipartimento di fisica, universitadi torino, via p. giuria 1, i-10125 torino, italyUNSPECIFIED
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 NetherlandsUNSPECIFIED
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, SpainUNSPECIFIED
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, SpainUNSPECIFIED
Hirano, T.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, JapanUNSPECIFIED
Justesen, A. B.Stellar Astrophysics Centre, Deparment of Physics and Astron-omy, Aarhus University, Ny Munkegrade 120, 8000 Aarhus C,DenmarkUNSPECIFIED
Cochran, W. D.Department of Astronomy and McDonald Observatory, Universityof Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712,USAUNSPECIFIED
Barragán, O.Sub-department of Astrophysics, Department of Physics, Universityof Oxford, Oxford OX1 3RH, UKUNSPECIFIED
Spina, L.Monash Centre for Astrophysics, School of Physics and Astronomy,Monash University, VIC 3800, AustraliaUNSPECIFIED
Rodler, F.Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USAUNSPECIFIED
Albrecht, S.Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, DenmarkUNSPECIFIED
Anderson, D. R.Department of Physics, University of Warwick, Gibbet Hill Road,Coventry, CV4 7AL, UKUNSPECIFIED
Amado, P. J.Instituto de Astrofisica de Andalucia (IAA-CSIC), Glorieta de la Astronomia s/n, 18008, Granada, SpainUNSPECIFIED
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, UKUNSPECIFIED
Caballero, J. A.Centro de Astrobiología (CSIC-INTA), ESAC, camino bajo delcastillo s/n, 28692 Villanueva de la Cañada, Madrid SpainUNSPECIFIED
Cabrera, J.nstitute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, GermanyUNSPECIFIED
Csizmadia, Sz.szilard.csizmadia (at) dlr.dehttps://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, USAUNSPECIFIED
De Leon, J.Department of Astronomy, Graduate School of Science, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, JapanUNSPECIFIED
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, SpainUNSPECIFIED
Eigmueller, Ph.philipp (at) eigmueller (at) dlr.deUNSPECIFIED
Endl, M.Department of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Austin, TX, 78712, USAUNSPECIFIED
Erikson, Aanders.erikson (at) dlr.deUNSPECIFIED
Esposito, M.Thueringer Landessternwarte, Sternwarte 5, Tautenburg 5, D-07778 Tautenburg, GermanyUNSPECIFIED
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, PortugalUNSPECIFIED
Georgieva, I.Department of Space, Earth and Environment, Onsala Space Observatory, Chalmers University of Technology, SE-439 92, Onsala, SwedenUNSPECIFIED
Grziwa, S.Rheinisches Institut fuer Umweltforschung an der Universitaet zu Koeln, Aachener Strasse 209, 50931 Koeln, GermanyUNSPECIFIED
Guenther, E.Thueringer Landessternwarte, Sternwarte 5, Tautenburg 5, D-07778 Tautenburg, GermanyUNSPECIFIED
Hatzes, A.P.Thueringer Landessternwarte, Sternwarte 5, Tautenburg 5, D-07778 Tautenburg, GermanyUNSPECIFIED
Hjorth, M.Stellar Astrophysics Centre, Deparment of Physics and Astronomy, Aarhus University, Ny Munkegrade 120, 8000 Aarhus C, DenmarkUNSPECIFIED
Hoeijmakers, H.J.Geneva Observatory, University of Geneva, Chemin des Mailettes51, 1290 Versoix, SwitzerlandUNSPECIFIED
Kabath, P.Astronomical Institute ASCR, Fricova 298, 25165 Ondrejov, Czech RepublicUNSPECIFIED
Korth, J.Rheinisches Institut für Umweltforschung an der Universitaet zu KoelnUNSPECIFIED
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, JapanUNSPECIFIED
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, SpainUNSPECIFIED
Lampon, M.Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de laAstronomía s/n, 18008 Granada, SpainUNSPECIFIED
Leão, I.C.Departamento de Física, Universidade Federal do Rio Grande doNorte, 59078-970 Natal, RN, BrazilUNSPECIFIED
Livingston, J.Department of Astronomy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, JapanUNSPECIFIED
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, SpainUNSPECIFIED
Montanes-Rodriguez, P.Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain | Departamento de Astrofisica, Universidad de La Laguna, 38206 La Laguna, SpainUNSPECIFIED
Morales, J.C.Institut de Ciències de l’Espai (ICE, CSIC), Campus UAB, C/ deCan Magrans s/n, 08193 Bellaterra, SpainUNSPECIFIED
Murgas, F.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Nagel, E.Hamburger Sternwarte, Gojenbergsweg 112, 21029, Hamburg, GermanyUNSPECIFIED
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; InstitutUNSPECIFIED
Nielsen, L.D.Geneva Observatory, University of Geneva, Chemin des Mailettes51, 1290 Versoix, SwitzerlandUNSPECIFIED
Patzold, M.Rheinisches Institut fuer Umweltforschung an der Universitaet zu Koeln, Aachener Strasse 209, 50931 Koeln, GermanyUNSPECIFIED
Persson, C.M.Department of Space, Earth and Environment, Chalmers Universityof Technology, Onsala Space Observatory, 439 92 Onsala, SwedenUNSPECIFIED
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, SpainUNSPECIFIED
Quirrenbach, A.Landessternwarte, Zentrum fur Astronomie der Universtat Heidelberg, Konigstuhl 12, 69117, Heidelberg, GermanyUNSPECIFIED
Rauer, H.heike.rauer (at) dlr.deUNSPECIFIED
Redfield, S.Astronomy Department and Van Vleck Observatory, Wesleyan University, Middletown, CT, 06459, USAUNSPECIFIED
Reiners, A.Institut fur Astrophysik, Georg-August-Universitat, Friedrich-Hund-Platz 1, 37077, Gottingen, GermanyUNSPECIFIED
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, SpainUNSPECIFIED
Smith, A.M.S.alexis.smith (at) dlr.deUNSPECIFIED
Svubjak, J.Astronomical Institute of the Czech Academy of Sciences, Friˇcova298, 25165 Ondˇrejov, Czech RepublicUNSPECIFIED
Van Eylen, V.Mullard Space Science Laboratory, University College London,Holmbury St Mary, Dorking, Surrey RH5 6NT, UKUNSPECIFIED
Wilson, P.A.entre for Exoplanets and Habitability, University of Warwick,Gibbet Hill Road, Coventry, CV4 7AL, UKUNSPECIFIED
Date:April 2020
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:636
DOI :10.1051/0004-6361/201937080
Page Range:A89
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
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
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Csizmadia, Szilard
Deposited On:12 Nov 2020 08:52
Last Modified:12 Nov 2020 08:52

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