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TOI-1055 b: Neptunian planet characterised with HARPS, TESS, and CHEOPS

Bonfanti, A. and Gandolfi, D. and Egger, J. A. and Fossati, L. and Cabrera, J. and Krenn, A. and Alibert, Y. and Benz, W. and Billot, N. and Florén, H. -G. and Lendl, M. and Adibekyan, V. and Salmon, S. and Santos, N. C. and Sousa, S. G. and Wilson, T. G. and Barragán, O. and Collier Cameron, A. and Delrez, L. and Esposito, M. and Goffo, E. and Osborne, H. L. M. and Osborn, H. P. and Serrano, L. M. and Van Eylen, V. and Alarcon, J. and Alonso, R. and Anglada, G. and Bàrczy, T. and Barrado Navascues, D. and Barros, S. C. C. and Baumjohann, W. and Beck, M. and Beck, T. and Bedell, M. and Bonfils, X. and Borsato, L. and Brandeker, A. and Broeg, C. and Charnoz, S. and Corral Van Damme, C. and Csizmadia, Sz. and Cubillos, P. E. and Davies, M. B. and Deleuil, M. and Demangeon, O. D. S. and Demory, B. -O. and Ehrenreich, D. and Erikson, A. and Fortier, A. and Fridlund, M. and Gillon, M. and Güdel, M. and Hoyer, S. and Isaak, K. G. and Kerschbaum, F. and Kiss, L. L. and Laskar, J. and Lecavelier des Etangs, A. and Lorenzo-Oliveira, D. and Lovis, C. and Magrin, D. and Marafatto, L. and Maxted, P. F. L. and Meléndez, J. and Mordasini, C. and Nascimbeni, V. and Olofsson, G. and Ottensamer, R. and Pagano, I. and Palle, E. and Peter, G. and Piazza, D. and Piotto, G. and Pollacco, D. and Queloz, D. and Ragazzoni, R. and Rando, N. and Rauer, H. and Ribas, I. and Scandariato, G. and Segransan, D. and Simon, A. E. and Smith, A. M. S. and Steller, M. and Szabó, Gy. M. and Thomas, N. and Udry, S. and Ulmer, B. and Van Grootel, V. and Venturini, J. and Walton, N. A. (2023) TOI-1055 b: Neptunian planet characterised with HARPS, TESS, and CHEOPS. Astronomy & Astrophysics, 671, L8. EDP Sciences. doi: 10.1051/0004-6361/202245607. ISSN 0004-6361.

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Official URL: https://www.aanda.org/articles/aa/full_html/2023/03/aa45607-22/aa45607-22.html

Abstract

Context. TOI-1055 is a Sun-like star known to host a transiting Neptune-sized planet on a 17.5-day orbit (TOI-1055 b). Radial velocity (RV) analyses carried out by two independent groups using nearly the same set of HARPS spectra have provided measurements of planetary masses that differ by ∼2σ. Aims: Our aim in this work is to solve the inconsistency in the published planetary masses by significantly extending the set of HARPS RV measurements and employing a new analysis tool that is able to account and correct for stellar activity. Our further aim was to improve the precision on measurements of the planetary radius by observing two transits of the planet with the CHEOPS space telescope. Methods: We fit a skew normal function to each cross correlation function extracted from the HARPS spectra to obtain RV measurements and hyperparameters to be used for the detrending. We evaluated the correlation changes of the hyperparameters along the RV time series using the breakpoint technique. We performed a joint photometric and RV analysis using a Markov chain Monte Carlo scheme to simultaneously detrend the light curves and the RV time series. Results: We firmly detected the Keplerian signal of TOI-1055 b, deriving a planetary mass of Mb = 20.4−2.5+2.6 M⊕ (∼12%). This value is in agreement with one of the two estimates in the literature, but it is significantly more precise. Thanks to the TESS transit light curves combined with exquisite CHEOPS photometry, we also derived a planetary radius of Rb = 3.490−0.064+0.070 R⊕ (∼1.9%). Our mass and radius measurements imply a mean density of ρb = 2.65−0.35+0.37 g cm−3 (∼14%). We further inferred the planetary structure and found that TOI-1055 b is very likely to host a substantial gas envelope with a mass of 0.41−0.20+0.34 M⊕ and a thickness of 1.05−0.29+0.30 R⊕. Conclusions: Our RV extraction combined with the breakpoint technique has played a key role in the optimal removal of stellar activity from the HARPS time series, enabling us to solve the tension in the planetary mass values published so far for TOI-1055 b.

Item URL in elib:https://elib.dlr.de/194669/
Document Type:Article
Title:TOI-1055 b: Neptunian planet characterised with HARPS, TESS, and CHEOPS
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bonfanti, A.Space Research Institute, Austrian Academy of Sciences, AustriaUNSPECIFIEDUNSPECIFIED
Gandolfi, D.Dipartimento di Fisica, Universita degli Studi di Torino, via Pietro Giuria 1, 10125, Torino, Italyhttps://orcid.org/0000-0001-8627-9628UNSPECIFIED
Egger, J. A.Physikalisches Institut, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, SwitzerlandUNSPECIFIEDUNSPECIFIED
Fossati, L.Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, AustriaUNSPECIFIEDUNSPECIFIED
Cabrera, J.UNSPECIFIEDhttps://orcid.org/0000-0001-6653-5487UNSPECIFIED
Krenn, A.Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz, AustriaUNSPECIFIEDUNSPECIFIED
Alibert, Y.Physikalisches Institut, University of BernUNSPECIFIEDUNSPECIFIED
Benz, W.Physikalisches Institut, Universität Bern, CHUNSPECIFIEDUNSPECIFIED
Billot, N.Université de Genève, SwitzerlandUNSPECIFIEDUNSPECIFIED
Florén, H. -G.Department of Astronomy, Stockholm University, AlbaNova University Center, SE-10691 Stockholm, SwedenUNSPECIFIEDUNSPECIFIED
Lendl, M.Geneva Observatory, University of Geneva, Chemin des Mailettes 51, 1290, Versoix, SwitzerlandUNSPECIFIEDUNSPECIFIED
Adibekyan, V.Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, PortugalUNSPECIFIEDUNSPECIFIED
Salmon, S.STAR, Université de Liège, BelgiumUNSPECIFIEDUNSPECIFIED
Santos, N. C.Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal; Departamento de Fisica e Astronomia, Faculdade de Ciencias, Universidade do Porto, Rua Campo Alegre, 4169-007 Porto, PortugalUNSPECIFIEDUNSPECIFIED
Sousa, S. G.Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, PortugalUNSPECIFIEDUNSPECIFIED
Wilson, T. G.School of Physics and Astronomy, St. Andrews, UKhttps://orcid.org/0000-0001-8749-1962UNSPECIFIED
Barragán, O.Sub-department of Astrophysics, Department of Physics, Universityof Oxford, Oxford OX1 3RH, UKUNSPECIFIEDUNSPECIFIED
Collier Cameron, A.SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife KY16 9SS, UKhttps://orcid.org/0000-0002-8863-7828UNSPECIFIED
Delrez, L.Institut d Astrophysique et de Geophysique, Universite de Liege, Allee du 6 Aout, 17, Bat. B5C, Liege 1, BelgiumUNSPECIFIEDUNSPECIFIED
Esposito, M.Thuringer Landessternwarte Tautenburg, Sternwarte 5, 07778, Tautenburg, GermanyUNSPECIFIEDUNSPECIFIED
Goffo, E.Dipartimento di Fisica, Università degli Studi di Torino, via PietroGiuria 1, I-10125, Torino, Italy ; Thüringer Landessternwarte Tautenburg, GermanyUNSPECIFIEDUNSPECIFIED
Osborne, H. L. M.Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UKUNSPECIFIEDUNSPECIFIED
Osborn, H. P.Center for Space and Habitability, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, Switzerland; Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, USAUNSPECIFIEDUNSPECIFIED
Serrano, L. M.Dipartimento di Fisica, Università degli Studi di Torino, via Pietro Giuria 1, I-10125, Torino, ItalyUNSPECIFIEDUNSPECIFIED
Van Eylen, V.Mullard Space Science Laboratory, University College London,Holmbury St Mary, Dorking, Surrey RH5 6NT, UKUNSPECIFIEDUNSPECIFIED
Alarcon, J.European Southern Observatory, Alonso de Cordova 3107, Santiago, ChileUNSPECIFIEDUNSPECIFIED
Alonso, R.Instituto de Astrofisica de Canarias (IAC), Via Lactea s/n 38200, La Laguna, SpainUNSPECIFIEDUNSPECIFIED
Anglada, G.Institut de Ciències de l’Espai (ICE, CSIC), Campus UAB, CanMagrans s/n, 08193 Bellaterra, Spain; Institut d’Estudis Espacials de Catalunya (IEEC), 08034 Barcelona,SpainUNSPECIFIEDUNSPECIFIED
Bàrczy, T.Admatis, Miskolc, HungaryUNSPECIFIEDUNSPECIFIED
Barrado Navascues, D.Depto. de Astrofisica, Centro de Astrobiologia (CSIC-INTA), ESAC Campus, E-28692 Villanueva de la Cañada, Madrid, SpainUNSPECIFIEDUNSPECIFIED
Barros, S. C. C.Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, PortugalUNSPECIFIEDUNSPECIFIED
Baumjohann, W.Space Research Institute, Austrian Academy of Sciences, Graz, Austriahttps://orcid.org/0000-0001-6271-0110UNSPECIFIED
Beck, M.Université de Genève, SwitzerlandUNSPECIFIEDUNSPECIFIED
Beck, T.Center for Space and Habitability, University of Bern, Gesellschaftsstraße 6, 3012, Bern, SwitzerlandUNSPECIFIEDUNSPECIFIED
Bedell, M.Center for Computational Astrophysics, Flatiron Institute, New York, NY, USAUNSPECIFIEDUNSPECIFIED
Bonfils, X.Institut de Planétologie et d'Astrophysique, University of Grenoble, FranceUNSPECIFIEDUNSPECIFIED
Borsato, L.Dipartimento di Fisica e Astronomia, Universita degli Studi di Padova, via Marzolo 8, 35131 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Brandeker, A.Department of Astronomy – Stockholm University, SE-106 91 Stockholm, SwedenUNSPECIFIEDUNSPECIFIED
Broeg, C.Physikalisches Institut, University of Bern, Bern, SwitzerlandUNSPECIFIEDUNSPECIFIED
Charnoz, S.Université de Paris, Institut de physique du globe de Paris, CNRS, 75005, Paris, FranceUNSPECIFIEDUNSPECIFIED
Corral Van Damme, C.ESA/ESTEC, NiederlandeUNSPECIFIEDUNSPECIFIED
Csizmadia, Sz.UNSPECIFIEDhttps://orcid.org/0000-0001-6803-9698UNSPECIFIED
Cubillos, P. E.INAF, Osservatorio Astrofisico di Torino, Via Osservatorio, 20, 10025, Pino Torinese, To, Italy; Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, AustriaUNSPECIFIEDUNSPECIFIED
Davies, M. B.Lund Observatory, Department of Astronomy and Theoretical Physics, Lund University, 22100, Lund, SwedenUNSPECIFIEDUNSPECIFIED
Deleuil, M.Laboratoire d´Astrophysique de Marseille, FranceUNSPECIFIEDUNSPECIFIED
Demangeon, O. D. S.Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, PortugalUNSPECIFIEDUNSPECIFIED
Demory, B. -O.Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, SwitzerlandUNSPECIFIEDUNSPECIFIED
Ehrenreich, D.Observatoire de Genève, University of Geneva, Switzerlandhttps://orcid.org/0000-0001-9704-5405UNSPECIFIED
Erikson, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fortier, A.Physikalisches Institut, University of Bern, Bern, Switzerlandhttps://orcid.org/0000-0001-8450-3374UNSPECIFIED
Fridlund, M.Department of Space, Earth and Environment, Onsala Space Observatory, Chalmers University of Technology, SE-439 92, Onsala, Sweden; Leiden Observatory, University of Leiden, PO Box 9513, 2300 RA, Leiden, The NetherlandsUNSPECIFIEDUNSPECIFIED
Gillon, M.Institut d’Astrophysique, Geophysique et Oceanographie, Universite de Liege, B-4000 Liege, BelgiumUNSPECIFIEDUNSPECIFIED
Güdel, M.Department of Astrophysics, University of Vienna, Tuerkenschanzstrasse 17, A-1180 Vienna, AustriaUNSPECIFIEDUNSPECIFIED
Hoyer, S.Laboratoire d’Astrophysique de Marseille, Univ. de Provence, FranceUNSPECIFIEDUNSPECIFIED
Isaak, K. G.ESA/ESTEC, Noordwijk, NiederlandeUNSPECIFIEDUNSPECIFIED
Kerschbaum, F.Department of Astrophysics, University of Vienna, Tuerkenschanzstrasse 17, 1180, Vienna, AustriaUNSPECIFIEDUNSPECIFIED
Kiss, L. L.Konkoly Observatory, Research Centre for Astronomy and Earth, Budapest, HungaryUNSPECIFIEDUNSPECIFIED
Laskar, J.IMCCE, UMR8028 CNRS, Observatoire de Paris, PSL Univ.,Sorbonne Univ., 77 av. Denfert-Rochereau, 75014 Paris, FranceUNSPECIFIEDUNSPECIFIED
Lecavelier des Etangs, A.Institut d Astrophysique de Paris, CNRS, UMR 7095 & Sorbonne Universites, UPMC Paris 6, 98 bis bd Arago, 75014 Paris, FranceUNSPECIFIEDUNSPECIFIED
Lorenzo-Oliveira, D.Universidade de Sao Paulo, Departamento de Astronomia doUNSPECIFIEDUNSPECIFIED
Lovis, C.Geneva Observatory, University of Geneva, Chemin des Mailettes 51, 1290, Versoix, SwitzerlandUNSPECIFIEDUNSPECIFIED
Magrin, D.INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Marafatto, L.INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Maxted, P. F. L.Astrophysics Group, Keele University, Staffordshire ST5 5BG, UKUNSPECIFIEDUNSPECIFIED
Meléndez, J.Universidade de São Paulo, IAG, Departamento de Astronomia, Rua do Matão 1226, 05509-900, São Paulo, SP, BrazilUNSPECIFIEDUNSPECIFIED
Mordasini, C.Physikalisches Institut, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, SwitzerlandUNSPECIFIEDUNSPECIFIED
Nascimbeni, V.INAF – Osservatorio Astronomico di Padova, vicolo dell Osservatorio 5, 35122 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Olofsson, G.Department of Astronomy, Stockholm University, AlbaNova University Center, 10691 Stockholm, SwedenUNSPECIFIEDUNSPECIFIED
Ottensamer, R.University of Vienna, Department of Astrophysics, AustriaUNSPECIFIEDUNSPECIFIED
Pagano, I.INAF – Osservatorio Astrofisico di Catania, Via S.Sofia 78, 95123 Catania, ItalyUNSPECIFIEDUNSPECIFIED
Palle, E.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain );; Departamento de Astrofisica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, SpainUNSPECIFIEDUNSPECIFIED
Peter, G.UNSPECIFIEDhttps://orcid.org/0000-0001-6101-2513UNSPECIFIED
Piazza, D.Physics Institute, Space Research & Planetary Sciences, University of Bern, Sidlerstr. 5, CH-3012 Bern, SwitzerlandUNSPECIFIEDUNSPECIFIED
Piotto, G.INAF – Osservatorio Astronomico di Padova, vicolo dell Osservatorio 5, 35122 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Pollacco, D.Department of Physics, University of Warwick, Coventry CV4 7AL, UKUNSPECIFIEDUNSPECIFIED
Queloz, D.Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge, CB3 0HE, UK; ETH Zurich, Department of Physics, Wolfgang-Pauli-Strasse 27, 8093, Zurich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Ragazzoni, R.INAF - Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Rando, N.ESA/ESTEC, NiederlandeUNSPECIFIEDUNSPECIFIED
Rauer, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ribas, I.Institut de Ciencies de l Espai (CSIC-IEEC), Carrer de Can Magrans, Campus UAB, E-08193 Bellaterra, SpainUNSPECIFIEDUNSPECIFIED
Scandariato, G.INAF, Osservatorio Astrofisico di Catania, Via S. Sofia 78, I-95123 Catania, ItalyUNSPECIFIEDUNSPECIFIED
Segransan, D.Observatoire de Geneve, Universite de Geneve, 51 Chemin des Maillettes, 1290 Sauverny, SwitzerlandUNSPECIFIEDUNSPECIFIED
Simon, A. E.Center for Space and Habitability, University of Bern, SwitzerlandUNSPECIFIEDUNSPECIFIED
Smith, A. M. S.UNSPECIFIEDhttps://orcid.org/0000-0002-2386-4341UNSPECIFIED
Steller, M.Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, AustriaUNSPECIFIEDUNSPECIFIED
Szabó, Gy. M.Department of Experimental Physics & Astronomical Observatory, University of Szeged, Szeged, HungaryUNSPECIFIEDUNSPECIFIED
Thomas, N.Physikalisches Institut, University of Bern, Sidlerstrasse 5, 3012, Bern, SwitzerlandUNSPECIFIEDUNSPECIFIED
Udry, S.Observatoire de Genève, Sauverny, SwitzerlandUNSPECIFIEDUNSPECIFIED
Ulmer, B.Institute of Optical Sensor Systems, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, GermanyUNSPECIFIEDUNSPECIFIED
Van Grootel, V.STAR, Université de Liège, BelgiumUNSPECIFIEDUNSPECIFIED
Venturini, J.Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, 1290, Versoix, SwitzerlandUNSPECIFIEDUNSPECIFIED
Walton, N. A.Institute of Astronomy, University of Cambridge, Cambridge, UKUNSPECIFIEDUNSPECIFIED
Date:8 March 2023
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:671
DOI:10.1051/0004-6361/202245607
Page Range:L8
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:techniques: radial velocities, techniques: photometric, planets and satellites: fundamental parameters, stars: fundamental parameters, 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 - CHEOPS Science, R - Project CHEOPS
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Leitungsbereich PF
Institute of Optical Sensor Systems > Space Instruments
Deposited By: Smith, Dr Alexis M S
Deposited On:25 Apr 2023 14:21
Last Modified:04 Dec 2023 11:18

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