TOI-519 b : A short-period substellar object around an M dwarf validated using multicolour photometry and phase curve analysis
(2021) In Astronomy and Astrophysics 645.- Abstract
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 to this group of unlikely systems, and it 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... (More)
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 to this group of unlikely systems, and it 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 estimated the radius of the transiting object using multicolour transit modelling, and we 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 a priori more likely given the lack of known massive planets in ≈ 1 day orbits around M dwarfs with Teff < 3800 K, and given the existence of some (but few) brown dwarfs.
(Less)
- author
- publishing date
- 2021-01-01
- type
- Contribution to journal
- publication status
- published
- keywords
- Methods: statistical, Planets and satellites: general, Stars: individual: TIC 218 795 833, Techniques: photometric
- in
- Astronomy and Astrophysics
- volume
- 645
- article number
- A16
- publisher
- EDP Sciences
- external identifiers
-
- scopus:85098173612
- ISSN
- 0004-6361
- DOI
- 10.1051/0004-6361/202038934
- language
- English
- LU publication?
- no
- additional info
- Funding Information: Acknowledgements. We 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. J.K. 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. M.T. 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. Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center for the production of the SPOC data products. This work makes use of observations from the LCOGT network. Funding Information: 6 Image Reduction and Analysis Facility (IRAF) is distributed by the National Optical Astronomy Observatories, which are operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation. Publisher Copyright: © ESO 2020.
- id
- ca7ee619-b755-4fe9-b5c0-d390dfd448e7
- date added to LUP
- 2023-02-01 10:37:43
- date last changed
- 2023-02-21 10:04:35
@article{ca7ee619-b755-4fe9-b5c0-d390dfd448e7,
abstract = {{<p>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 to this group of unlikely systems, and it 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 estimated the radius of the transiting object using multicolour transit modelling, and we 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 a priori more likely given the lack of known massive planets in ≈ 1 day orbits around M dwarfs with Teff < 3800 K, and given the existence of some (but few) brown dwarfs.</p>}},
author = {{Parviainen, H. and Palle, E. and Zapatero-Osorio, M. R. and Nowak, G. and Fukui, A. and Murgas, F. and Narita, N. and Stassun, K. G. and Livingston, J. H. and Collins, K. A. and Hidalgo Soto, D. and Béjar, V. J.S. and Korth, J. and Monelli, M. and Montanes Rodriguez, P. and Casasayas-Barris, N. and Chen, G. and Crouzet, N. and De Leon, J. P. and Hernandez, A. and Kawauchi, K. and Klagyivik, P. and Kusakabe, N. and Luque, R. and Mori, M. and Nishiumi, T. and Prieto-Arranz, J. and Tamura, M. and Watanabe, N. and Gan, T. and Collins, K. I. and Jensen, E. L.N. and Barclay, T. and Doty, J. P. and Jenkins, J. M. and Latham, D. W. and Paegert, M. and Ricker, G. and Rodriguez, D. R. and Seager, S. and Shporer, A. and Vanderspek, R. and Villaseñor, J. and Winn, J. N. and Wohler, B. and Wong, I.}},
issn = {{0004-6361}},
keywords = {{Methods: statistical; Planets and satellites: general; Stars: individual: TIC 218 795 833; Techniques: photometric}},
language = {{eng}},
month = {{01}},
publisher = {{EDP Sciences}},
series = {{Astronomy and Astrophysics}},
title = {{TOI-519 b : A short-period substellar object around an M dwarf validated using multicolour photometry and phase curve analysis}},
url = {{http://dx.doi.org/10.1051/0004-6361/202038934}},
doi = {{10.1051/0004-6361/202038934}},
volume = {{645}},
year = {{2021}},
}