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The TOI-763 system: sub-Neptunes orbiting a Sun-like star

Fridlund, M. and Livingston, J. and Gandolfi, D. and Persson, C.M. and Lam, K.W.F. and Stassun, K.G. and Hellier, C. and Korth, J. and Hatzes, A.P. and Malavolta, L. and Luque, R. and Redfield, S. and Guenther, E.W. and Albrecht, S. and Barragán, O. and Benatti, S. and Bouma, L. and Cabrera, J. and Cochran, W.D. and Csizmadia, S. and Dai, F. and Deeg, H.J. and Esposito, M. and Georgieva, I. and Grziwa, S. and González Cuesta, L. and Hirano, T. and Jenkins, J.M. and Kabath, P. and Knudstrup, E. and Latham, D.W. and Mathur, S. and Mullally, S.E. and Narita, N. and Nowak, G. and Olofsson, A.O.H. and Palle, E. and Patzold, M. and Pompei, E. and Rauer, H. and Ricker, G. and Rodler, F. and Seager, S. and Serrano, L.M. and Smith, A.M.S. and Spina, L. and Subjak, J. and Tenenbaum, P. and Ting, E.B. and Vanderburg, A. and Vanderspek, R. and Van Eylen, V. and Villanueva, S. and Winn, J.N. (2020) The TOI-763 system: sub-Neptunes orbiting a Sun-like star. Monthly Notices of the Royal Astronomical Society, 498 (3), pp. 4503-4517. Oxford University Press. doi: 10.1093/mnras/staa2502. ISSN 0035-8711.

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Official URL: https://academic.oup.com/mnras/article/498/3/4503/5894401

Abstract

We report the discovery of a planetary system orbiting TOI-763(aka CD-39 7945), a V = 10.2, high proper motion G-type dwarf star that was photometrically monitored by the TESS space mission in Sector 10. We obtain and model the stellar spectrum and find an object slightly smaller than the Sun, and somewhat older, but with a similar metallicity. Two planet candidates were found in the light curve to be transiting the star. Combining TESS transit photometry with HARPS high-precision radial velocity (RV) follow-up measurements confirm the planetary nature of these transit signals. We determine masses, radii, and bulk densities of these two planets. A third planet candidate was discovered serendipitously in the RV data. The inner transiting planet, TOI-763 b, has an orbital period of Pb = 5.6 d, a mass of Mb = 9.8 ± 0.8 M⊕, and a radius of Rb = 2.37 ± 0.10 R⊕. The second transiting planet, TOI-763 c, has an orbital period of Pc = 12.3 d, a mass of Mc = 9.3 ± 1.0 M⊕, and a radius of Rc = 2.87 ± 0.11 R⊕. We find the outermost planet candidate to orbit the star with a period of ∼48 d. If confirmed as a planet, it would have a minimum mass of Md = 9.5 ± 1.6 M⊕. We investigated the TESS light curve in order to search for a mono transit by planet d without success. We discuss the importance and implications of this planetary system in terms of the geometrical arrangements of planets orbiting G-type stars.

Item URL in elib:https://elib.dlr.de/137497/
Document Type:Article
Title:The TOI-763 system: sub-Neptunes orbiting a Sun-like star
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Fridlund, M.Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 439 92, Onsala, Sweden; Leiden Observatory, Leiden University, 2333CA, Leiden, The NetherlandsUNSPECIFIED
Livingston, J.Department of Astronomy, The University of Tokyo, 7-3-1 Bunkyo-ku, Tokyo 113-0033, JapanUNSPECIFIED
Gandolfi, D.Dipartimento di Fisica, Universita di Torino, via P. Giuria 1, I-10125 Torino, ItalyUNSPECIFIED
Persson, C.M.Department of Space, Earth and Environment, Chalmers University ofTechnology, Onsala Space Observatory, SE-439 92 Onsala, SwedenUNSPECIFIED
Lam, K.W.F.Center for Astronomy and Astrophysics, Technical University Berlin, Hardenbergstr. 36, D-10623 Berlin, GermanyUNSPECIFIED
Stassun, K.G.Physics and Astronomy Department, Vanderbilt University, Nashville, TN37235, USAUNSPECIFIED
Hellier, C.Astrophysics Group, Keele University, Staffordshire ST5 5BG, UKUNSPECIFIED
Korth, J.Rheinisches Institut fuer Umweltforschung an der Universitaet zu Koeln, Aachener Strasse 209, 50931 Koeln, GermanyUNSPECIFIED
Hatzes, A.P.Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778, Tautenburg, GermanyUNSPECIFIED
Malavolta, L.INAF, Osservatorio Astronomico di Padova, Padova, ItalyUNSPECIFIED
Luque, R.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain );; Departamento de Astrofisica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Redfield, S.Astronomy Department and Van Vleck Observatory, Wesleyan University, Middletown, CT 06459, USAUNSPECIFIED
Guenther, E.W.Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778, Tautenburg, GermanyUNSPECIFIED
Albrecht, S.Stellar Astrophysics Centre, Deparment of Physics and Astronomy, Aarhus University, Ny Munkegrade 120, 8000 Aarhus C, DenmarkUNSPECIFIED
Barragán, O.Sub-department of Astrophysics, Department of Physics, Universityof Oxford, Oxford OX1 3RH, UKUNSPECIFIED
Benatti, S.INAF - Osservatorio Astronomico di Padova, Vcolo dell'Osservatorio 5, 35122-Padova, ItalyUNSPECIFIED
Bouma, L.Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane,Princeton, NJ 08544, USAUNSPECIFIED
Cabrera, J.juan.cabrera (at) dlr.deUNSPECIFIED
Cochran, W.D.Department of Astronomy and McDonald Observatory, University of Texasat Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USAUNSPECIFIED
Csizmadia, S.Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489 Berlin, GermanyUNSPECIFIED
Dai, F.Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute ofTechnology, Cambridge, MA 02139, USAUNSPECIFIED
Deeg, H.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
Esposito, M.Thuringer Landessternwarte Tautenburg, Sternwarte 5, 07778, Tautenburg, Germany );UNSPECIFIED
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
González Cuesta, L.Instituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna,SpainUNSPECIFIED
Hirano, T.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, JapanUNSPECIFIED
Jenkins, J.M.NASA Ames Research Center, Moffet Field, CA 94035, USAUNSPECIFIED
Kabath, P.Astronomical Institute ASCR, Fricova 298, 25165 Ondrejov, Czech RepublicUNSPECIFIED
Knudstrup, E.Stellar Astrophysics Centre, Deparment of Physics and Astronomy, Aarhus University, Ny Munkegrade 120, 8000 Aarhus C, DenmarkUNSPECIFIED
Latham, D.W.Center for Astrophysics|Harvard & Smithsonian, 60 Garden Street,Cambridge, MA 02138, USAUNSPECIFIED
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
Mullally, S.E.Department of Aeronautics and Astronautics, MIT, 77 MassachusettsAvenue, Cambridge, MA 02139, USAUNSPECIFIED
Narita, N.Department of Astronomy, The University of Tokyo, 7-3-1 Bunkyo-ku, Tokyo 113-0033, JapanUNSPECIFIED
Nowak, G.Instituto de Astrofisica de Canarias (IAC), Via Lactea s/n 38200, La Laguna, SpainUNSPECIFIED
Olofsson, A.O.H.Department of Space, Earth and Environment, Chalmers University ofTechnology, Onsala Space Observatory, SE-439 92 Onsala, SwedenUNSPECIFIED
Palle, E.Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain | Departamento de Astrofisica, Universidad de La Laguna, 38206 La Laguna, SpainUNSPECIFIED
Patzold, M.Rheinisches Institut fuer Umweltforschung an der Universitaet zu Koeln, Aachener Strasse 209, 50931 Koeln, GermanyUNSPECIFIED
Pompei, E.European Southern Observatory, Casilla, Santiago, ChileUNSPECIFIED
Rauer, H.heike.rauer (at) dlr.deUNSPECIFIED
Ricker, G.Department of Physics and Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, MA, 02139, USAUNSPECIFIED
Rodler, F.Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USAUNSPECIFIED
Seager, S.NSF Graduate Research Fellow, Steward Observatory, University of Arizona, Tucson, AZ, 85721, USA; Department of Earth, Atmospheric and Planetary Sciences, MIT, Cambridge, MA, 02139, USA; Department of Aeronautics and Astronautics, MIT, Cambridge, MA, 0213UNSPECIFIED
Serrano, L.M.Dipartimento di Fisica, Universita di Torino, via P. Giuria 1, I-10125 Torino, ItalyUNSPECIFIED
Smith, A.M.S.alexis.smith (at) dlr.deUNSPECIFIED
Spina, L.Monash Centre for Astrophysics, School of Physics and Astronomy,Monash University, VIC 3800, AustraliaUNSPECIFIED
Subjak, J.Astronomical Institute, Czech Academy of Sciences, Fricova 298, 25165, Ondrejov, Czech Republic; Astronomical Institute, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 2027/3, 12116, Prague, Czech RepublicUNSPECIFIED
Tenenbaum, P.SETI Institute/NASA Ames Research Center, Moffet Field, CA 94035, USAUNSPECIFIED
Ting, E.B.NASA Ames Research Center, Moffet Field, CA 94035, USAUNSPECIFIED
Vanderburg, A.Department of Astronomy, University of Wisconsin-Madison, Madison, WI53706, USAUNSPECIFIED
Vanderspek, R.Department of Physics and Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, MA, 02139, USAUNSPECIFIED
Van Eylen, V.Mullard Space Science Laboratory, University College London, HolmburySt Mary, Dorking, Surrey RH5 6NT, UKUNSPECIFIED
Villanueva, S.Department of Physics and Kavli Institute for Astrophysics and SpaceResearch, Massachusetts Institute of Technology, Cambridge, MA 02139,USAUNSPECIFIED
Winn, J.N.Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane,Princeton, NJ 08544, USAUNSPECIFIED
Date:August 2020
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:498
DOI :10.1093/mnras/staa2502
Page Range:pp. 4503-4517
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:planets and satellites: detection, planets and satellites: individual: TOI-763, planets and satellites: individual: TIC 178819686, Astrophysics - Earth and Planetary 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:16 Nov 2020 12:22
Last Modified:16 Nov 2020 12:22

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