Show simple item record

dc.contributor.authorCloutier, R.en_US
dc.contributor.authorAstudillo-Defru, N.en_US
dc.contributor.authorBonfils, X.en_US
dc.contributor.authorJenkins, J.S.en_US
dc.contributor.authorBerdiñas, Z.en_US
dc.contributor.authorRicker, G.en_US
dc.contributor.authorVanderspek, R.en_US
dc.contributor.authorLatham, D.W.en_US
dc.contributor.authorSeager, S.en_US
dc.contributor.authorWinn, J.en_US
dc.contributor.authorJenkins, J.M.en_US
dc.contributor.authorAlmenara, J.M.en_US
dc.contributor.authorBouchy, F.en_US
dc.contributor.authorDelfosse, X.en_US
dc.contributor.authorDíaz, M.R.en_US
dc.contributor.authorDíaz, R.F.en_US
dc.contributor.authorDoyon, R.en_US
dc.contributor.authorFigueira, P.en_US
dc.contributor.authorForveille, T.en_US
dc.contributor.authorKurtovic, N.T.en_US
dc.contributor.authorLovis, C.en_US
dc.contributor.authorMayor, M.en_US
dc.contributor.authorMenou, K.en_US
dc.contributor.authorMorgan, E.en_US
dc.contributor.authorMorris, R.en_US
dc.contributor.authorMuirhead, P.en_US
dc.contributor.authorMurgas, F.en_US
dc.contributor.authorPepe, F.en_US
dc.contributor.authorSantos, N.C.en_US
dc.contributor.authorSégransan, D.en_US
dc.contributor.authorSmith, J.C.en_US
dc.contributor.authorTenenbaum, P.en_US
dc.contributor.authorTorres, G.en_US
dc.contributor.authorUdry, S.en_US
dc.contributor.authorVezie, M.en_US
dc.contributor.authorVillasenor, J.en_US
dc.date.accessioned2020-03-25T15:25:56Z
dc.date.available2020-03-25T15:25:56Z
dc.date.issued2019-09
dc.identifier.citationR. Cloutier, N. Astudillo-Defru, X. Bonfils, J.S. Jenkins, Z. Berdiñas, G. Ricker, R. Vanderspek, D.W. Latham, S. Seager, J. Winn, J.M. Jenkins, J.M. Almenara, F. Bouchy, X. Delfosse, M.R. Díaz, R.F. Díaz, R. Doyon, P. Figueira, T. Forveille, N.T. Kurtovic, C. Lovis, M. Mayor, K. Menou, E. Morgan, R. Morris, P. Muirhead, F. Murgas, F. Pepe, N.C. Santos, D. Ségransan, J.C. Smith, P. Tenenbaum, G. Torres, S. Udry, M. Vezie, J. Villasenor. 2019. "Characterization of the L 98-59 multi-planetary system with HARPS." Astronomy & Astrophysics, Volume 629, pp. A111 - A111. https://doi.org/10.1051/0004-6361/201935957
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.urihttps://hdl.handle.net/2144/39810
dc.description.abstract<jats:p><jats:italic>Aims.</jats:italic> L 98-59 (TIC 307210830, TOI-175) is a nearby M3 dwarf around which TESS revealed three small transiting planets (0.80, 1.35, 1.57 Earth radii) in a compact configuration with orbital periods shorter than 7.5 days. Here we aim to measure the masses of the known transiting planets in this system using precise radial velocity (RV) measurements taken with the HARPS spectrograph.</jats:p> <jats:p><jats:italic>Methods.</jats:italic> We considered both trained and untrained Gaussian process regression models of stellar activity, which are modeled simultaneously with the planetary signals. Our RV analysis was then supplemented with dynamical simulations to provide strong constraints on the planets’ orbital eccentricities by requiring long-term stability.</jats:p> <jats:p><jats:italic>Results.</jats:italic> We measure the planet masses of the two outermost planets to be 2.42 ± 0.35 and 2.31 ± 0.46 Earth masses, which confirms the bulk terrestrial composition of the former and eludes to a significant radius fraction in an extended gaseous envelope for the latter. We are able to place an upper limit on the mass of the smallest, innermost planet of &lt;1.01 Earth masses with 95% confidence. Our RV plus dynamical stability analysis places strong constraints on the orbital eccentricities and reveals that each planet’s orbit likely has <jats:italic>e</jats:italic> &lt; 0.1.</jats:p> <jats:p><jats:italic>Conclusions.</jats:italic> L 98-59 is likely a compact system of two rocky planets plus a third outer planet with a lower bulk density possibly indicative of the planet having retained a modest atmosphere. The system offers a unique laboratory for studies of planet formation, dynamical stability, and comparative atmospheric planetology as the two outer planets are attractive targets for atmospheric characterization through transmission spectroscopy. Continued RV monitoring will help refine the characterization of the innermost planet and potentially reveal additional planets in the system at wider separations.</jats:p>en_US
dc.format.extentP. A111 - A111en_US
dc.language.isoen_US
dc.publisherEDP Sciencesen_US
dc.relation.ispartofAstronomy & Astrophysics
dc.rights© ESO 2019.en_US
dc.subjectIndividual starsen_US
dc.subjectPlanetary systemsen_US
dc.subjectLow-mass starsen_US
dc.subjectPlanets and satellitesen_US
dc.subjectRadial velocitiesen_US
dc.subjectAstronomical and space sciencesen_US
dc.subjectAstronomy & astrophysicsen_US
dc.subjectTerrestrial planetsen_US
dc.subjectL 98-59en_US
dc.titleCharacterization of the L 98-59 multi-planetary system with HARPSen_US
dc.typeArticleen_US
dc.description.versionPublished versionen_US
dc.identifier.doi10.1051/0004-6361/201935957
pubs.elements-sourcecrossrefen_US
pubs.notesEmbargo: Not knownen_US
pubs.organisational-groupBoston Universityen_US
pubs.organisational-groupBoston University, College of Arts & Sciencesen_US
pubs.organisational-groupBoston University, College of Arts & Sciences, Department of Astronomyen_US
pubs.publication-statusPublisheden_US
dc.date.online2019-09-13
dc.identifier.orcid0000-0002-0638-8822 (Muirhead, P)
dc.identifier.mycv488493


This item appears in the following Collection(s)

Show simple item record