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  • Alqasim, A.University College London (UCL) (author)

TOI−757 b: an eccentric transiting mini−Neptune on a 17.5−d orbit

  • Article/chapterEnglish2024

Publisher, publication year, extent ...

  • 2024
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:e049ff0c-50d5-4702-9968-357f0c096ced
  • https://research.chalmers.se/publication/542403URI
  • https://doi.org/10.1093/mnras/stae1767DOI

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  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • We report the spectroscopic confirmation and fundamental properties of TOI−757 b, a mini−Neptune on a 17.5−d orbit transiting a bright star (V = 9.7 mag) discovered by the TESS mission. We acquired high−precision radial velocity measurements with the HARPS, ESPRESSO, and PFS spectrographs to confirm the planet detection and determine its mass. We also acquired space−borne transit photometry with the CHEOPS space telescope to place stronger constraints on the planet radius, supported with ground−based LCOGT photometry. WASP and KELT photometry were used to help constrain the stellar rotation period. We also determined the fundamental parameters of the host star. We find that TOI−757 b has a radius of Rp = 2.5 ± 0.1R. and a mass of Mp = 10.5+−2212M, implying a bulk density of ρp = 3.6 ± 0.8 g cm−3. Our internal composition modelling was unable to constrain the composition of TOI−757 b, highlighting the importance of atmospheric observations for the system. We also find the planet to be highly eccentric with e = 0.39+−000708, making it one of the very few highly eccentric planets among precisely characterized mini−Neptunes. Based on comparisons to other similar eccentric systems, we find a likely scenario for TOI−757 b’s formation to be high eccentricity migration due to a distant outer companion. We additionally propose the possibility of a more intrinsic explanation for the high eccentricity due to star−star interactions during the earlier epoch of the Galactic disc formation, given the low metallicity and older age of TOI−757.

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  • Grieves, N.Université de Genève,University of Geneva (author)
  • Rosário, N. M.Universidade do Porto,University of Porto (author)
  • Gandolfi, D.Universita degli Studi di Torino,University of Turin (author)
  • Livingston, J.H.University of Tokyo, Japan (author)
  • Sousa, S.G.Universidade do Porto,University of Porto (author)
  • Collins, Karen A.Harvard-Smithsonian Center for Astrophysics (author)
  • Teske, J. K. (author)
  • Fridlund, Malcolm,1952Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)malfri (author)
  • Egger, J. A.Universität Bern,University of Bern (author)
  • Cabrera, J.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Hellier, CoelKeele University (author)
  • Lanza, A. F.Istituto nazionale di astrofisica (INAF) (author)
  • Van Eylen, VincentUniversity College London (UCL) (author)
  • Bouchy, F.Université de Genève,University of Geneva (author)
  • Oelkers, R.J.Texas A and M University (author)
  • Srdoc, G. (author)
  • Goffo, E.Carnegie Observatories (author)
  • Wilson, T.G.European Space Research and Technology Centre (ESA ESTEC) (author)
  • Goffo, E.Universita degli Studi di Torino,University of Turin (author)
  • Delrez, L.Technische Universität Graz (author)
  • Sefako, RamotholoUniversita degli Studi di Torino,University of Turin (author)
  • Barros, S.C.C.The University of Warwick (author)
  • Collins, Kevin I.Stockholms universitet,Stockholm University (author)
  • Heitzmann, A.Tsinghua University (author)
  • Bonfanti, A.Université de Genève,University of Geneva (author)
  • Alonso, R.Université de Genève,University of Geneva (author)
  • Bárczy, T.Universität Bern,University of Bern (author)
  • Barrado Navascues, D.Universität Bern,University of Bern (author)
  • Baumjohann, W.Katholieke Universiteit Leuven (author)
  • Benz, W.Universidade do Porto,University of Porto (author)
  • Billot, N.South African Astronomical Observatory (author)
  • Borsato, L.Universidade do Porto,University of Porto (author)
  • Broeg, C.George Mason University (author)
  • Alonso, R.Århus Universitet,Aarhus University (author)
  • Asquier, J.European Space Research and Technology Centre (ESA ESTEC) (author)
  • Cochran, William D.Universidad de la Laguna,University of La Laguna (author)
  • Cameron, A. Collier (author)
  • Baumjohann, W.Université de Genève,University of Geneva (author)
  • Csizmadia, SzilardUniversität Bern,University of Bern (author)
  • Benz, W.Universität Bern,University of Bern (author)
  • Daylan, TansuUniversité de Genève,University of Geneva (author)
  • Deleuil, M.European Space Astronomy Centre (ESAC) (author)
  • Demory, B.O.Universität Bern,University of Bern (author)
  • Bryant, E.University College London (UCL) (author)
  • Butler, R.P. (author)
  • Cochran, William D.Istituto nazionale di astrofisica (INAF) (author)
  • Collier Cameron, A.The University of Texas at Austin, USA (author)
  • Correia, A.University of St Andrews (author)
  • Crane, J.D.Carnegie Observatories (author)
  • Csizmadia, SzilardDeutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Cubillos, P. E.Université de Genève,University of Geneva (author)
  • Davies, M. B.Istituto nazionale di astrofisica (INAF) (author)
  • Daylan, TansuLunds universitet,Lund University (author)
  • Deleuil, M.Washington University in St. Louis (author)
  • Deline, A.Université de Genève,University of Geneva (author)
  • Demory, B.O.Universität Bern,University of Bern (author)
  • Derekas, A.Laboratoire d'Astrophysique de Marseille (author)
  • Edwards, BillyEötvös Loránd University (ELTE) (author)
  • Ehrenreich, D.Université de Genève,University of Geneva (author)
  • Erikson, AndersDeutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Essack, ZahraUniversité de Genève,University of Geneva (author)
  • Fortier, A.Universität Bern,University of Bern (author)
  • Gazeas, K.University of New Mexico (author)
  • Gillon, MichaëlUniversität Bern,University of Bern (author)
  • Gudel, M.University of Athens (author)
  • Hasiba, J.Université de Genève,University of Geneva (author)
  • Hatzes, A.Thüringer Landessternwarte Tautenburg (author)
  • Helling, Ch.Thüringer Landessternwarte Tautenburg (author)
  • Hirano, T.Universität Wien,University of Vienna (author)
  • Howell, S.B.National Astronomical Observatory of Japan (author)
  • Hoyer, S.Washington University in St. Louis (author)
  • Isaak, K.European Space Research and Technology Centre (ESA ESTEC) (author)
  • Jenkins, Jon M.National Astronomical Observatory of Japan (author)
  • Kanodia, S. (author)
  • Kiss, L. L.NASA Ames Research Center (author)
  • Korth, JudithEötvös Loránd University (ELTE) (author)
  • Lam, K. W.F.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Laskar, J.Lunds universitet,Lund University (author)
  • des Etangs, A. L.Observatoire de Paris,Paris Observatory (author)
  • Lendl, M.Université de Genève,University of Geneva (author)
  • Lund, M. B.Institut d 'Astrophysique de Paris (author)
  • Luque, R.California Institute of Technology (Caltech) (author)
  • Mann, A.University of Chicago (author)
  • Magrin, D.European Space Astronomy Centre (ESAC) (author)
  • Maxted, P.Keele University (author)
  • Mordasini, C.Universität Bern,University of Bern (author)
  • Ehrenreich, D.Universität Wien,University of Vienna (author)
  • Essack, ZahraEuropean Space Astronomy Centre (ESAC) (author)
  • Fortier, A.Instituto de Astrofísica de Canarias (author)
  • Olofsson, G.The University of Warwick (author)
  • Gillon, MichaëlUniversität Bern,University of Bern (author)
  • Howell, S.B.University College London (UCL) (author)
  • Hoyer, S.European Southern Observatory (ESO) (author)
  • Isaak, K.University of Athens (author)
  • Pagano, I.Istituto nazionale di astrofisica (INAF) (author)
  • Palle, E.Århus Universitet,Aarhus University (author)
  • Korth, JudithLas Campanas Observatory (author)
  • Lam, K. W.F.European Space Astronomy Centre (ESAC) (author)
  • Nascimbeni, ValerioUniversity of Athens (author)
  • Olofsson, G.Università Degli Studi di Padova,University of Padua (author)
  • Osborn, H. P.European Space Astronomy Centre (ESAC) (author)
  • Rando, N.European Space Research and Technology Centre (ESA ESTEC) (author)
  • Ottensamer, R.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Pagano, I.Freie Universität Berlin (author)
  • Palle, E.Wesleyan University (author)
  • Peter, G.Institut d'Estudis Espacials de Catalunya (IEEC),Institute of Space Studies of Catalonia (IEEC) (author)
  • Piotto, Giampaolo P.Uniwersytet Mikolaja Kopernika w Toruniu,Nicolaus Copernicus University (author)
  • Rieder, M.Universität Bern,University of Bern (author)
  • Ragazzoni, RobertoUniversité de Genève,University of Geneva (author)
  • Rauer, H.Universidade do Porto,University of Porto (author)
  • Redfield, S.Istituto nazionale di astrofisica (INAF) (author)
  • Ribas, I.Uniwersytet Mikolaja Kopernika w Toruniu,Nicolaus Copernicus University (author)
  • Segransan, D.Université de Genève,University of Geneva (author)
  • Ricker, George R.Uniwersytet Mikolaja Kopernika w Toruniu,Nicolaus Copernicus University (author)
  • Santos, N. C.Universität Bern,University of Bern (author)
  • Scandariato, GaetanoDeutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Stalport, M.Universität Bern,University of Bern (author)
  • Segransan, D.Laboratoire d'Astrophysique de Marseille (author)
  • Shporer, AviCarnegie Observatories (author)
  • Simon, A.E.National Astronomical Observatory of Japan (author)
  • Smith, Alexis M. S.Université de Genève,University of Geneva (author)
  • Szabó, G.M.Uniwersytet Mikolaja Kopernika w Toruniu,Nicolaus Copernicus University (author)
  • Twicken, J. D.Universite de Liège,University of Liège (author)
  • Udry, S.Université de Genève,University of Geneva (author)
  • Vanderspek, Roland K.Århus Universitet,Aarhus University (author)
  • Van Grootel, V.Uniwersytet Mikolaja Kopernika w Toruniu,Nicolaus Copernicus University (author)
  • Venturini, J.European Space Astronomy Centre (ESAC) (author)
  • Viotto, V.European Space Astronomy Centre (ESAC) (author)
  • Walton, N. A.SETI Institute (author)
  • Winn, J. N.University Of Cambridge (author)
  • Yee, S.W.Harvard-Smithsonian Center for Astrophysics (author)
  • University College London (UCL)Université de Genève (creator_code:org_t)

Related titles

  • In:Monthly Notices of the Royal Astronomical Society533:1, s. 1-260035-87111365-2966

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