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

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Résumé

We report the spectroscopic confirmation and fundamental properties of TOI-757 b, a mini-Neptune on a 17.5-day 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 $R_{\mathrm{p}} = 2.5 \pm 0.1 R_{\oplus}$ and a mass of $M_{\mathrm{p}} = 10.5^{+2.2}_{-2.1} M_{\oplus}$, implying a bulk density of $ρ_{\text{p}} = 3.6 \pm 0.8$ g cm$^{-3}$. Our internal composition modeling 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$^{+0.08}_{-0.07}$, 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 disk formation, given the low metallicity and older age of TOI-757.

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La notice

Revue

arXiv (Cornell University)

Thématique

Astro and Planetary Science

Domaine

Physics and Astronomy

Établissements canadiens

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Organismes subventionnaires

Core Research for Evolutional Science and TechnologyEuropean Regional Development FundStaatssekretariat für Bildung, Forschung und InnovationScience and Technology Facilities CouncilHorizon 2020 Framework ProgrammeAmes Research CenterInstituto de Astrofísica de CanariasUAE Space AgencyVetenskapsrådetMinistry of Science, ICT and Future PlanningFundação para a Ciência e a TecnologiaCentre National d’Etudes SpatialesFonds De La Recherche Scientifique - FNRSUK Space AgencyAustrian Science FundUniversidad de La LagunaSwedish National Space AgencyNational Research, Development and Innovation OfficeAgencia Estatal de InvestigaciónScience Mission DirectorateSchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen ForschungUniversity of WarwickAgencia Nacional de Investigación y DesarrolloUniversité de GenèveGeneralitat de CatalunyaNational Science FoundationBelgian Federal Science Policy OfficeDeutsche ForschungsgemeinschaftCentres de Recerca de CatalunyaCanadian Celiac AssociationAgence Nationale de la RechercheMinistério da Ciência, Tecnologia, Inovações e ComunicaçõesKorea Astronomy and Space Science InstituteSpace Telescope Science InstituteNational Aeronautics and Space AdministrationMinisterio de Ciencia e InnovaciónEuropean CommissionFondazione CRTJapan Society for the Promotion of ScienceWashington University in St. LouisEuropean Space AgencyNemzeti Kutatási Fejlesztési és Innovációs HivatalCalifornia Institute of TechnologyUniwersytet Mikolaja Kopernika w ToruniuUniversité de LiègeSimons Foundation

Mots-clés

NeptuneOrbit (dynamics)EccentricAstronomyPhysicsOrbital eccentricityPlanetAerospace engineeringEngineering

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