TOI-519 b: a short-period substellar object around an M dwarf validated using multicolour photometry and phase curve analysis

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dc.contributor.authorParviainen, H.
dc.contributor.authorPalle, E.
dc.contributor.authorZapatero-Osorio, M.R.
dc.contributor.authorNowak, G.
dc.contributor.authorFukui, A.
dc.contributor.authorMurgas, F.
dc.contributor.authorNarita, N.
dc.contributor.authorStassun, K.G.
dc.contributor.authorLivingston, J.H.
dc.contributor.authorCollins, K.A.
dc.contributor.authorHidalgo Soto, D.
dc.contributor.authorBéjar, V.J.S.
dc.contributor.authorKorth, J.
dc.contributor.authorMonelli, M.
dc.contributor.authorMontanes Rodriguez, P.
dc.contributor.authorCasasayas-Barris, N.
dc.contributor.authorChen, G.
dc.contributor.authorCrouzet, N.
dc.contributor.authorde Leon, J.P.
dc.contributor.authorHernandez, A.
dc.contributor.authorKawauchi, K.
dc.contributor.authorKlagyivik, P.
dc.contributor.authorKusakabe, N.
dc.contributor.authorLuque, R.
dc.contributor.authorMori, M.
dc.contributor.authorNishiumi, T.
dc.contributor.authorPrieto-Arranz, J.
dc.contributor.authorTamura, M.
dc.contributor.authorWatanabe, N.
dc.contributor.authorGan, T.
dc.contributor.authorCollins, K.I.
dc.contributor.authorJensen, E.L.N.
dc.contributor.authorBarclay, T.
dc.contributor.authorDoty, J.P.
dc.contributor.authorJenkins, J.M.
dc.contributor.authorLatham, D.W.
dc.contributor.authorPaegert, M.
dc.contributor.authorRicker, G.
dc.contributor.authorRodriguez, D.R.
dc.contributor.authorSeager, S.
dc.contributor.authorShporer, A.
dc.contributor.authorVanderspek, R.
dc.contributor.authorVillaseñor, J.
dc.contributor.authorWinn, J.N.
dc.contributor.authorWohler, B.
dc.contributor.authorWong, I.
dc.date.accessioned2020-12-11T17:10:57Z
dc.date.available2020-12-11T17:10:57Z
dc.date.issued2020-11-23
dc.description.abstractContext: We report the discovery of TOI-519 b (TIC 218795833), a transiting substellar object (R = 1.07 RJup) orbiting a faint M dwarf (V = 17.35) on a 1.26 d orbit. Brown dwarfs and massive planets orbiting M dwarfs on short-period orbits are rare, but more have already been discovered than expected from planet formation models. TOI-519 is a valuable addition into this group of unlikely systems, and adds towards our understanding of the boundaries of planet formation. Aims: We set out to determine the nature of the Transiting Exoplanet Survey Satellite (TESS ) object of interest TOI-519 b. Methods: Our analysis uses a SPOC-pipeline TESS light curve from Sector 7, multicolour transit photometry observed with MuSCAT2 and MuSCAT, and transit photometry observed with the LCOGT telescopes. We estimate the radius of the transiting object using multicolour transit modelling, and set upper limits for its mass, effective temperature, and Bond albedo using a phase curve model that includes Doppler boosting, ellipsoidal variations, thermal emission, and reflected light components. Results: TOI-519 b is a substellar object with a radius posterior median of 1.07 RJup and 5th and 95th percentiles of 0.66 and 1.20 RJup, respectively, where most of the uncertainty comes from the uncertainty in the stellar radius. The phase curve analysis sets an upper effective temperature limit of 1800 K, an upper Bond albedo limit of 0.49, and a companion mass upper limit of 14 MJup. The companion radius estimate combined with the Teff and mass limits suggests that the companion is more likely a planet than a brown dwarf, but a brown-dwarf scenario is more likely a priori given the lack of known massive planets in 1 day orbits around M dwarfs with Teff < 3800 K, and the existence of some (but few) brown dwarfs.en_US
dc.description.sponsorshipWe thank the anonymous referee for their helpful and constructive comments. We acknowledge financial support from the Agencia Estatal de Investigación of the Ministerio de Ciencia, Innovación y Universidades and the European FEDER/ERF funds through projects ESP2013-48391-C4-2-R, AYA2016-79425-C3-2-P, AYA2015-69350-C3-2-P, and PID2019-109522GB-C53, and PGC2018- 098153-B-C31. This work is partly financed by the Spanish Ministry of Economics and Competitiveness through project ESP2016-80435- C2-2-R. We acknowledge supports by JSPS KAKENHI Grant Numbers JP17H04574, JP18H01265, and JP18H05439, and JST PRESTO Grant Number JPMJPR1775. JK acknowledges support by Deutsche Forschungsgemeinschaft (DFG) grants PA525/18-1 and PA525/19-1 within the DFG Schwerpunkt SPP 1992, Exploring the Diversity of Extra-solar Planets. MT is supported by JSPS KAKENHI grant Nos. 18H05442, 15H02063, and 22000005. This work was partly supported by Grant-in-Aid for JSPS Fellows, Grant Number JP20J21872. This article is partly based on observations made with the MuSCAT2 instrument, developed by ABC, at Telescopio Carlos Sánchez operated on the island of Tenerife by the IAC in the Spanish Observatorio del Teide. We acknowledge the use of public TESS Alert data from pipelines at the TESS Science Office and at the TESS Science Processing Operations Center. This work makes use of observations from the LCOGT network.en_US
dc.description.urihttps://arxiv.org/abs/2011.11458en_US
dc.format.extent15 pagesen_US
dc.genrejournal articles preprintsen_US
dc.identifierdoi:10.13016/m2pc5i-o8lp
dc.identifier.citationH. Parviainen, E. Palle, M.R. Zapatero-Osorio et al., TOI-519 b: a short-period substellar object around an M dwarf validated using multicolour photometry and phase curve analysis, https://arxiv.org/abs/2011.11458en_US
dc.identifier.urihttp://hdl.handle.net/11603/20236
dc.language.isoen_USen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsPublic Domain Mark 1.0*
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleTOI-519 b: a short-period substellar object around an M dwarf validated using multicolour photometry and phase curve analysisen_US
dc.typeTexten_US

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