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:

Authors	Institution or Email of Authors	Author'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, 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

Date:

April 2020

Journal or Publication Title:

Astronomy & Astrophysics

Refereed publication:

Yes

Open Access:

Yes

Gold Open Access:

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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