Greening of the brown-dwarf desert. EPIC 212036875b: a 51 M_J object in a 5-day orbit around an F7 V star
| العنوان: | Greening of the brown-dwarf desert. EPIC 212036875b: a 51 M_J object in a 5-day orbit around an F7 V star |
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| المؤلفون: | David Nespral, Judith Korth, Martin Pätzold, Pilar Montañes Rodríguez, Alexis M. S. Smith, Jan Subjak, Emil Knudstrup, Juan Cabrera, Paul G. Beck, Jorge Prieto-Arranz, Sascha Grziwa, Prajwal Niraula, Szilard Csizmadia, Seth Redfield, Savita Mathur, Grzegorz Nowak, Iskra Georgieva, A. Fukui, Felipe Murgas, M. Hjorth, Eike W. Guenther, Jerome de Leon, Hans J. Deeg, Heike Rauer, Ignasi Ribas, Teruyuki Hirano, Mikkel N. Lund, Roi Alonso Sobrino, Malcolm Fridlund, John H. Livingston, Davide Gandolfi, Enric Palle, Oscar Barragán, Melvyn B. Davies, William D. Cochran, L. González-Cuesta, Nobuhiko Kusakabe, Artie P. Hatzes, Alexander J. Mustill, K. W. F. Lam, Massimiliano Esposito, Anders Erikson, Michael Endl, Philipp Eigmüller, Hannu Parviainen, A. O. Henrik Olofsson, Petr Kabath, Carina M. Persson, Marek Skarka, Ilaria Carleo, Norio Narita, Marshall C. Johnson, Simon Albrecht, Rafael Luque, Fei Dai, V. Van Eylen, Diego Hidalgo, Motohide Tamura |
| المصدر: | Astronomy and Astrophysics (0004-6361), 628, A64 Persson, C M, Csizmadia, S, Mustill, A J, Fridlund, M, Hatzes, A P, Nowak, G, Georgieva, I, Gandolfi, D, Davies, M B, Livingston, J H, Palle, E, Montanes Rodriguez, P, Endl, M, Hirano, T, Prieto-Arranz, J, Korth, J, Grziwa, S, Esposito, M, Albrecht, S, Johnson, M C, Barragan, O, Parviainen, H, Van Eylen, V, Alonso Sobrino, R, Beck, P G, Cabrera, J, Carleo, I, Cochran, W D, Dai, F, Deeg, H J, de Leon, J P, Eigmueller, P, Erikson, A, Fukui, A, Gonzalez-Cuesta, L, Guenther, E W, Hidalgo, D, Hjorth, M, Kabath, P, Knudstrup, E, Kusakabe, N, Lam, K W F, Lund, M N, Luque, R, Mathur, S, Murgas, F, Narita, N, Nespral, D, Niraula, P, Olofsson, A O H, Paetzold, M, Rauer, H, Redfield, S, Ribas, I, Skarka, M, Smith, A M S, Subjak, J & Tamura, M 2019, ' Greening of the brown-dwarf desert EPIC 212036875b : a 51 M-J object in a 5-day orbit around an F7V star ', Astronomy & Astrophysics, vol. 628, 64 . https://doi.org/10.1051/0004-6361/201935505 |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Stellar mass, fundamental parameters [stars], Brown dwarf, FOS: Physical sciences, Orbital eccentricity, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, MASS, WARM JUPITER, 01 natural sciences, HOT JUPITER, photometric [techniques], techniques: photometric, individual: EPIC 212036875 [stars], Planet, 0103 physical sciences, techniques: radial velocities, Astrophysics::Solar and Stellar Astrophysics, DOPPLER FOLLOW-UP, 010303 astronomy & astrophysics, planetary systems, DISSIPATION, Astrophysics::Galaxy Astrophysics, Physics, MINI-NEPTUNE, Earth and Planetary Astrophysics (astro-ph.EP), RADIAL-VELOCITY, 010308 nuclear & particles physics, Astronomy and Astrophysics, radial velocities [techniques], Radius, TRANSITING EXTRASOLAR PLANETS, Exoplanet, Radial velocity, Stars, GIANT PLANETS, Space and Planetary Science, stars: individual: EPIC 212036875, stars: fundamental parameters, Astrophysics::Earth and Planetary Astrophysics, TIDAL EVOLUTION, Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | Our aim is to investigate the nature and formation of brown dwarfs by adding a new well-characterised object to the small sample of less than 20 transiting brown dwarfs. One brown dwarf candidate was found by the KESPRINT consortium when searching for exoplanets in the K2 space mission Campaign 16 field. We combined the K2 photometric data with a series of multi-colour photometric observations, imaging and radial velocity measurements to rule out false positive scenarios and to determine the fundamental properties of the system. We report the discovery and characterisation of a transiting brown dwarf in a 5.17 day eccentric orbit around the slightly evolved F7V star EPIC 212036875. We find a stellar mass of 1.15+/-0.08 M$_\odot$, a stellar radius of 1.41+/-0.05 R$_\odot$, and an age of 5.1+/-0.9 Gyr. The mass and radius of the companion brown dwarf are 51+/-2 MJ and 0.83+/-0.03 RJ, respectively, corresponding to a mean density of 108+15-13 g cm-3. EPIC 212036875 b is a rare object that resides in the brown dwarf desert. In the mass-density diagram for planets, brown dwarfs and stars, we find that all giant planets and brown dwarfs follow the same trend from ~0.3 MJ to the turn-over to hydrogen burning stars at ~73 MJ. EPIC 212036875 b falls close to the theoretical model for mature H/He dominated objects in this diagram as determined by interior structure models, as well as the empirical fit. We argue that EPIC 212036875 b formed via gravitational disc instabilities in the outer part of the disc, followed by a quick migration. Orbital tidal circularisation may have started early in its history for a brief period when the brown dwarf's radius was larger. The lack of spin-orbit synchronisation points to a weak stellar dissipation parameter which implies a circularisation timescale of >23 Gyr, or suggests an interaction between the magnetic and tidal forces of the star and the brown dwarf. 14 pages, 12 figures, accepted 13 June 2019 for publication in A&A |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 2120-3687 |
| DOI: | 10.1051/0004-6361/201935505 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a0888e99f3696f4924d1c6749509b86f https://hdl.handle.net/1887/84975 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....a0888e99f3696f4924d1c6749509b86f |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 21203687 |
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| DOI: | 10.1051/0004-6361/201935505 |