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dc.contributor.authorLacedelli, G.
dc.contributor.authorMalavolta, L.
dc.contributor.authorBorsato, L.
dc.contributor.authorPiotto, G.
dc.contributor.authorNardiello, D.
dc.contributor.authorMortier, A.
dc.contributor.authorStalport, M.
dc.contributor.authorCameron, A. Collier
dc.contributor.authorPoretti, E.
dc.contributor.authorBuchhave, L. A.
dc.contributor.authorLópez-Morales, M.
dc.contributor.authorNascimbeni, V.
dc.contributor.authorWilson, T. G.
dc.contributor.authorUdry, S.
dc.contributor.authorLatham, D. W.
dc.contributor.authorBonomo, A. S.
dc.contributor.authorDamasso, M.
dc.contributor.authorDumusque, X.
dc.contributor.authorJenkins, J. M.
dc.contributor.authorLovis, C.
dc.contributor.authorRice, K.
dc.contributor.authorSasselov, D.
dc.contributor.authorWinn, J. N.
dc.contributor.authorAndreuzzi, G.
dc.contributor.authorCosentino, R.
dc.contributor.authorCharbonneau, D.
dc.contributor.authorDi Fabrizio, L.
dc.contributor.authorMartinez Fiorenzano, A. F.
dc.contributor.authorGhedina, A.
dc.contributor.authorHarutyunyan, A.
dc.contributor.authorLienhard, F.
dc.contributor.authorMicela, G.
dc.contributor.authorMolinari, E.
dc.contributor.authorPagano, I.
dc.contributor.authorPepe, F.
dc.contributor.authorPhillips, D. F.
dc.contributor.authorPinamonti, M.
dc.contributor.authorRicker, G.
dc.contributor.authorScandariato, G.
dc.contributor.authorSozzetti, A.
dc.contributor.authorWatson, C. A.
dc.date.accessioned2021-01-11T15:30:07Z
dc.date.available2021-01-11T15:30:07Z
dc.date.issued2021-03
dc.identifier.citationLacedelli , G , Malavolta , L , Borsato , L , Piotto , G , Nardiello , D , Mortier , A , Stalport , M , Cameron , A C , Poretti , E , Buchhave , L A , López-Morales , M , Nascimbeni , V , Wilson , T G , Udry , S , Latham , D W , Bonomo , A S , Damasso , M , Dumusque , X , Jenkins , J M , Lovis , C , Rice , K , Sasselov , D , Winn , J N , Andreuzzi , G , Cosentino , R , Charbonneau , D , Di Fabrizio , L , Martinez Fiorenzano , A F , Ghedina , A , Harutyunyan , A , Lienhard , F , Micela , G , Molinari , E , Pagano , I , Pepe , F , Phillips , D F , Pinamonti , M , Ricker , G , Scandariato , G , Sozzetti , A & Watson , C A 2021 , ' An unusually low density ultra-short period super-Earth and three mini-Neptunes around the old star TOI-561 ' , Monthly Notices of the Royal Astronomical Society , vol. 501 , no. 3 , pp. 4148–4166 . https://doi.org/10.1093/mnras/staa3728en
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 272209964
dc.identifier.otherPURE UUID: 9081639f-3261-4aa7-8f78-8187bf541c29
dc.identifier.otherArXiv: http://arxiv.org/abs/2009.02332v2
dc.identifier.otherORCID: /0000-0002-8863-7828/work/86986559
dc.identifier.otherORCID: /0000-0001-8749-1962/work/86987363
dc.identifier.otherScopus: 85100809245
dc.identifier.otherWOS: 000686047600006
dc.identifier.urihttps://hdl.handle.net/10023/21262
dc.descriptionFunding: GL acknowledges support by CARIPARO Foundation, according to the agreement CARIPARO-Universit`a degli Studidi Padova (Pratica n. 2018/0098), and scholarship support by the “Soroptimist International d’Italia” association (Cortina d’Ampezzo Club). GLa, LBo, GPi, VN, GS, and IPa acknowledge the funding support from Italian Space Agency (ASI) regulated by “Accordo ASI-INAF n. 2013-016-R.0 del 9 luglio 2013 e integrazione del 9 luglio 2015 CHEOPS Fasi A/B/C”. DNa acknowledges the support from the French Centre National d’Etudes Spatiales (CNES). AM acknowledges support from the senior Kavli Institute Fellowships. ACC acknowledges support from STFC consolidated grant ST/R000824/1 and UK Space Agency grant ST/R003203/1. ASB and MPi acknowledge financial contribution from the ASI-INAF agreement n.2018-16-HH.0. XD is grateful to the Branco-Weiss Fellowship for continuous support.This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No. 851555). JNW thanks the Heising-Simons Foundation for support).en
dc.description.abstractBased on HARPS-N radial velocities (RVs) and TESS photometry, we present a full characterisation of the planetary system orbiting the late G dwarf After the identification of three transiting candidates by TESS, we discovered two additional external planets from RV analysis. RVs cannot confirm the outer TESS transiting candidate, which would also make the system dynamically unstable. We demonstrate that the two transits initially associated with this candidate are instead due to single transits of the two planets discovered using RVs. The four planets orbiting TOI-561 include an ultra-short period (USP) super-Earth (TOI-561 b) with period Pb = 0.45 d, mass Mb = 1.59 ± 0.36 M⊕ and radius Rb = 1.42 ± 0.07 R⊕, and three mini-Neptunes: TOI-561 c, with Pc = 10.78 d, Mc = 5.40 ± 0.98 M⊕, Rc = 2.88 ± 0.09 R⊕; TOI-561 d, with Pd = 25.6 d, Md = 11.9 ± 1.3 M⊕, Rd = 2.53 ± 0.13 R⊕; and TOI-561 e, with Pe = 77.2 d, Me = 16.0 ± 2.3 M⊕, Re = 2.67 ± 0.11 R⊕. Having a density of 3.0 ± 0.8 g cm−3, TOI-561 b is the lowest density USP planet known to date. Our N-body simulations confirm the stability of the system and predict a strong, anti-correlated, long-term transit time variation signal between planets d and e. The unusual density of the inner super-Earth and the dynamical interactions between the outer planets make TOI-561 an interesting follow-up target.
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.rightsCopyright © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1093/mnras/staa3728.en
dc.subjectPlanets and satellites: detectionen
dc.subjectPlants and satellites: compositionen
dc.subjectStar: individual: TOI-561 (TIC 377064495, Gaia DR2 3850421005290172416)en
dc.subjectTechniques: photometricen
dc.subjectTechniques: radial velocitiesen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.subjectDASen
dc.subject.lccQBen
dc.subject.lccQCen
dc.titleAn unusually low density ultra-short period super-Earth and three mini-Neptunes around the old star TOI-561en
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. St Andrews Centre for Exoplanet Scienceen
dc.identifier.doihttps://doi.org/10.1093/mnras/staa3728
dc.description.statusPeer revieweden
dc.identifier.grantnumberST/R00824/1en
dc.identifier.grantnumberST/R003203/1en


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