MuSCAT2 multicolour validation of TESS candidates: an ultra-short-period substellar object around an M dwarf
Author
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Parviainen, H.
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Palle, E.
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Zapatero Osorio, M. R.
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Montanes Rodríguez, P.
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Murgas, F.
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Narita, N.
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Hidalgo Soto, D.
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Béjar, V. J. S.
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Korth, J.
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Monelli, M.
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Casasayas Barris, N.
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Crouzet, N.
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León, J. P. de
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Fukui, A.
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Hernández, A.
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Klagyivik, P.
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Kusakabe, N.
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Luque, R.
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Mori, M.
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Nishiumi, T.
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Prieto Arranz, J.
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Tamura, M.
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Watanabe, N.
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Burke, C.
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Charbonneau, D.
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Collins, K. A.
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Collins, K. I.
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Conti, D.
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García Soto, A.
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Jenkins, J. S.
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Jenkins, J. M.
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Jenkins, J. M.
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Levine, A.
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Li, J.
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Rinehart, S.
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Seager, S.
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Tenenbaum, P.
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Ting, E. B.
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Vanderspek, R.
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Vezie, M.
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Winn, J. N.
Admission date
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2020-06-08T16:01:26Z
Available date
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2020-06-08T16:01:26Z
Publication date
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2020
Cita de ítem
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A&A 633, A28 (2020)
es_ES
Identifier
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10.1051/0004-6361/201935958
Identifier
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https://repositorio.uchile.cl/handle/2250/175296
Abstract
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Context. We report the discovery of TOI 263.01 (TIC 120916706), a transiting substellar object (R = 0.87 R-Jup) orbiting a faint M3.5 V dwarf (V = 18.97) on a 0.56 d orbit.Aims. We setout to determine the nature of the Transiting Exoplanet Survey Satellite (TESS) planet candidate TOI 263.01 using ground-based multicolour transit photometry. The host star is faint, which makes radial-velocity confirmation challenging, but the large transit depth makes the candidate suitable for validation through multicolour photometry.Methods. Our analysis combines three transits observed simultaneously in r, i ', and z(s) bands usingthe MuSCAT2 multicolour imager, three LCOGT-observed transit light curves in g ', r ', and i ' bands, a TESS light curve from Sector 3, and a low-resolution spectrum for stellar characterisation observed with the ALFOSC spectrograph. We modelled the light curves with PYTRANSIT using a transit model that includes a physics-based light contamination component, allowing us to estimate the contamination from unresolved sources from the multicolour photometry. Using this information we were able to derive the true planet-star radius ratio marginalised over the contamination allowed by the photometry.Combining this with the stellar radius, we were able to make a reliable estimate of the absolute radius of the object.Results. The ground-based photometry strongly excludes contamination from unresolved sources with a significant colour difference to TOI 263. Furthermore, contamination from sources of the same stellar type as the host is constrained to levels where the true radius ratio posterior has a median of 0.217 and a 99 percentile of0.286. The median and maximum radius ratios correspond to absolute planet radii of 0.87 and 1.41 R-Jup, respectively,which confirms the substellar nature of the planet candidate. The object is either a giant planetor a brown dwarf (BD) located deep inside the so-called "brown dwarf desert". Both possibilities offer a challenge to current planet/BD formation models and make TOI 263.01 an object that merits in-depth follow-up studies.
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Patrocinador
dc.description.sponsorship
Agencia Estatal de Investigacion of the Ministerio de Ciencia, Innovacion y Universidades.
European FEDER/ERF : ESP2013-48391-C4-2-R, AYA2016-79425-C3-2-P, AYA2015-69350-C3-2-P.
Spanish Ministry of Economics and Competitiveness: ESP2016-80435-C2-2-R.
Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT).
Japan Society for the Promotion of Science.
Grants-in-Aid for Scientific Research (KAKENHI): JP18H01265, JP18H05439.
Japan Science & Technology Agency (JST): JPMJPR1775.
German Research Foundation (DFG): PA525/18-1, PA525/19-1.
German Research Foundation (DFG): Schwerpunkt SPP 1992.
Diversity of Extra-solar Planets.
NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center.