TOI-519 b: A short-period substellar object around an M dwarf validated using multicolour photometry and phase curve analysis
| Autor: | Felipe Murgas, Ian Wong, Víctor J. S. Béjar, Nobuhiko Kusakabe, John P. Doty, Noriharu Watanabe, P. Montanes Rodriguez, Matteo Monelli, J. Villasenor, P. Klagyivik, N. Crouzet, Enric Palle, Núria Casasayas-Barris, Hannu Parviainen, Sara Seager, Grzegorz Nowak, D. R. Rodriguez, Karen A. Collins, Roland Vanderspek, Bill Wohler, Keivan G. Stassun, Martin Paegert, Jon M. Jenkins, Joshua N. Winn, George R. Ricker, J. P. de Leon, Kevin I. Collins, David W. Latham, Eric L. N. Jensen, Andrés Felipe Valencia Hernández, Avi Shporer, Tianjun Gan, M. R. Zapatero-Osorio, Jorge Prieto-Arranz, Mayuko Mori, Guo Chen, Motohide Tamura, John H. Livingston, T. Nishiumi, A. Fukui, Rafael Luque, Kiyoe Kawauchi, Norio Narita, Thomas Barclay, Judith Korth, D. Hidalgo Soto |
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| Přispěvatelé: | Monelli, M. [0000-0001-5292-6380], Collins, K. [0000-0003-2781-3207], Paegert, M. [0000-0001-8120-7457], Luque, R. [0000-0002-4671-2957], Ministerio de Economía y Competitividad (MINECO), Agencia Estatal de Investigación (AEI), Japan Society for the Promotion of Science (JSPS), Deutsche Forschungsgemeinschaft (DFG) |
| Rok vydání: | 2021 |
| Předmět: |
statistical [Methods]
010504 meteorology & atmospheric sciences Brown dwarf FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Photometry (optics) symbols.namesake individual: TIC 218 795 833 [Stars] Bond albedo Planet 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics stars: individual: TIC 218 795 833 / planets and satellites: general / methods: statistical / techniques: photometric Substellar object 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Earth and Planetary Astrophysics (astro-ph.EP) Physics photometric [Techniques] Astronomy and Astrophysics Effective temperature Light curve Exoplanet general [Planets and satellites] Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science symbols Astrophysics::Earth and Planetary Astrophysics Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | Astronomy & Astrophysics DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacial instname |
| ISSN: | 0004-6361 2187-9583 |
| DOI: | 10.1051/0004-6361/202038934 |
| Popis: | Context: 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. Accepted to A&A |
| Databáze: | OpenAIRE |
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