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  • Osborne, H. L.M.European Southern Observatory (ESO),University College London (UCL),European Southern Observatory,University College London (author)

TOI-544 b: a potential water-world inside the radius valley in a two-planet system

  • Article/chapterEnglish2024

Publisher, publication year, extent ...

  • 2024
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:c26a5b4e-273f-4b63-aef0-6a1cf0e96f70
  • https://doi.org/10.1093/mnras/stad3837DOI
  • https://research.chalmers.se/publication/539684URI
  • https://lup.lub.lu.se/record/5af8cb63-ba01-4940-ba70-a3382503e353URI

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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 on the precise radial velocity follow-up of TOI-544 (HD 290498),ã bright K star ( V = 10.8), which hostsã small transiting planet recently disco v ered by the Trãnsiting Exoplanet Survey Satellite (TESS) . We collected 122 high-resolution High Accuracy Radial velocity Planet Searcher (HARPS)ãnd HARPS-N spectra to spectroscopically confirm the transiting planetãnd measure its mass. The nearly 3-yr baseline of our follow-upãllowed us to unveil the presence ofãnãdditional, non-transiting, longer-period companion planet. We derivedã radiusãnd mass for the inner planet, TOI-544 b, of 2.018 ±0.076 R⊙and 2.89 ±0.48 M⊙, respectively, which givesã bulk density of 1 . 93 + 0 . 30 -0 . 25 g cm -3 . TOI-544 c hasã minimum mass of 21.5 ±2.0 M⊙and orbital period of 50.1 ±0.2 d. The low density of planet-b implies that it has eitherãn Earth-like rocky core withã hydrogenãtmosphere, orã composition which harboursã significant fraction of water. The composition interpretation is degenerate depending on the specific choice of planet interior models used. Additionally, TOI-544 b hasãn orbital period of 1.55 dãnd equilibrium temperature of 999 ±14 K, placing it within the predicted location of the radius valley, where few planetsãre expected. TOI-544 b isã top target for futureãtmospheric observations, for example with JWST , which would enable better constraints of the planet composition.

Subject headings and genre

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  • Van Eylen, VincentUniversity College London (UCL),University College London (author)
  • Goffo, E.Thüringer Landessternwarte Tautenburg,Universita degli Studi di Torino,University of Turin,Thuringer Landessternwarte Tautenburg (author)
  • Gandolfi, D.Universita degli Studi di Torino,University of Turin (author)
  • Nowak, G.Universidad de la Laguna,University of La Laguna,Uniwersytet Mikolaja Kopernika w Toruniu,Nicolaus Copernicus University,Instituto de Astrofísica de Canarias,University of La Laguna (ULL) (author)
  • Persson, Carina,1964Chalmers tekniska högskola,Chalmers University of Technology,Onsala Space Observatory(Swepub:cth)carina64 (author)
  • Livingston, J.H.National Institutes of Natural Sciences (NINS),National Astronomical Observatory of Japan,The Graduate University for Advanced Studies (SOKENDAI),National Institutes of Natural Sciences - AstroBiology Center,Graduate University for Advanced Studies (author)
  • Weeks, A.University College London (UCL),University College London (author)
  • Palle, EnricUniversidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias,University of La Laguna (ULL) (author)
  • Luque, R.University of Chicago (author)
  • Hellier, CoelKeele University (author)
  • Carleo, IlariaInstituto de Astrofísica de Canarias (author)
  • Redfield, S.Wesleyan University (author)
  • Hirano, T.National Institutes of Natural Sciences (NINS),National Astronomical Observatory of Japan,The Graduate University for Advanced Studies (SOKENDAI),Graduate University for Advanced Studies,National Institutes of Natural Sciences - AstroBiology Center (author)
  • Gili, M. GarbaccioUniversita degli Studi di Torino,University of Turin (author)
  • Alarcon, JavierEuropean Southern Observatory Santiago (author)
  • Barragán, O.University Of Oxford,University of Oxford (author)
  • Casasayas-Barris, NúriaUniversidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias,University of La Laguna (ULL) (author)
  • Díaz, Matías R.Las Campanas Observatory (author)
  • Esposito, M.Thüringer Landessternwarte Tautenburg,Thuringer Landessternwarte Tautenburg (author)
  • Knudstrup, E.Århus Universitet,Aarhus University (author)
  • Jenkins, James S.Centro de Astrofísica y Tecnologías Afines (CATA),,Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA),CSIC Instituto de Astrofísica de Andalucía (IAA) (author)
  • Murgas, F.Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna,University of La Laguna (ULL),Onsala Space Observatory,Leiden University (author)
  • Orell-Miquel, J.Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias,University of La Laguna (ULL) (author)
  • Rodler, F.European Southern Observatory Santiago (author)
  • Serrano, L. M.Universita degli Studi di Torino,University of Turin (author)
  • Stangret, M.Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna,University of La Laguna (ULL) (author)
  • Albrecht, S. H.Århus Universitet,Aarhus University (author)
  • Alqasim, A.University College London (UCL),University College London,Thuringer Landessternwarte Tautenburg (author)
  • Cochran, William D.The University of Texas at Austin, USA,University of Texas at Austin (author)
  • Deeg, H.Universidad Diego Portales,Diego Portales University,University of Chicago (author)
  • Fridlund, Malcolm,1952Universiteit Leiden (UL),Leiden University (UL),Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)malfri (author)
  • Hatzes, A.Thüringer Landessternwarte Tautenburg (author)
  • Korth, J.Lund University,Lunds universitet,Astrofysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Astrophysics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)ju7237ko (author)
  • Lam, K. W.F.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR),German Aerospace Center (DLR) (author)
  • European Southern Observatory (ESO)University College London (UCL) (creator_code:org_t)

Related titles

  • In:Monthly Notices of the Royal Astronomical Society527:4, s. 11138-111570035-87111365-2966

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