Greening of the brown-dwarf desert EPIC 212036875b: a 51 M-J
object in a 5-day orbit around an F7V star

J 2019

Greening of the brown-dwarf desert EPIC 212036875b: a 51 M-J object in a 5-day orbit around an F7V star

PERSSON, Carina M., Szilard CSIZMADIA, Alexander J. MUSTILL, Malcolm FRIDLUND, Artie P. HATZES et. al.

Základní údaje

Originální název

Greening of the brown-dwarf desert EPIC 212036875b: a 51 M-J object in a 5-day orbit around an F7V star

Autoři

PERSSON, Carina M. (garant), Szilard CSIZMADIA, Alexander J. MUSTILL, Malcolm FRIDLUND, Artie P. HATZES, Grzegorz NOWAK, Iskra GEORGIEVA, Davide GANDOLFI, Melvyn B. DAVIES, John H. LIVINGSTON, Enric PALLE, Pilar RODRIGUEZ, Michael ENDL, Teruyuki HIRANO, Jorge PRIETO-ARRANZ, Judith KORTH, Sascha GRZIWA, Massimiliano ESPOSITO, Simon ALBRECHT, Marshall C. JOHNSON, Oscar BARRAGAN, Hannu PARVIAINEN, Eylen Vincent VAN, Roi SOBRINO, Paul G. BECK, Juan CABRERA, Ilaria CARLEO, William D. COCHRAN, Fei DAI, Hans J. DEEG, Jerome P. DE LEON, Philipp EIGMULLER, Anders ERIKSON, Akai FUKUI, Lucia GONZALEZ-CUESTA, Eike W. GUENTHER, Diego HIDALGO, Maria HJORTH, Petr KABÁTH (203 Česká republika), Emil KNUDSTRUP, Nobuhiko KUSAKABE, Kristine W. F. LAM, Mikkel N. LUND, Rafael LUQUE, Savita MATHUR, Felipe MURGAS, Norio NARITA, David NESPRAL, Prajwal NIRAULA, A. O. Henrik OLOFSSON, Martin PATZOLD, Heike RAUER, Seth REDFIELD, Ignasi RIBAS, Marek SKARKA (203 Česká republika, domácí), Alexis M. S. SMITH, Jan SUBJAK a Motohide TAMURA

Vydání

ASTRONOMY & ASTROPHYSICS, Les Ulis, EDP SCIENCES S A, 2019, 1432-0746

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Francie

Utajení

není předmětem státního či obchodního tajemství

Odkazy

Full Text

Impakt faktor

Impact factor: 5.636

Kód RIV

RIV/00216224:14310/19:00111909

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1051/0004-6361/201935505

UT WoS

000480314000002

Klíčová slova anglicky

planetary systems; stars: fundamental parameters; stars: individual: EPIC 212036875; techniques: photometric; techniques: radial velocities

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 11. 5. 2020 10:29, Mgr. Marie Šípková, DiS.

Anotace

V originále

Context. Although more than 2000 brown dwarfs have been detected to date, mainly from direct imaging, their characterisation is difficult due to their faintness and model-dependent results. In the case of transiting brown dwarfs, however, it is possible to make direct high-precision observations. Aims. Our aim is to investigate the nature and formation of brown dwarfs by adding a new well-characterised object, in terms of its mass, radius and bulk density, to the currently small sample of less than 20 transiting brown dwarfs. Methods. 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 multicolour photometric observations, imaging, and radial velocity measurements to rule out false positive scenarios and to determine the fundamental properties of the system. Results. 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-circle dot, a stellar radius of 1.41 +/- 0.05 R-circle dot, and an age of 5.1 +/- 0.9 Gyr. The mass and radius of the companion brown dwarf are 51 +/- 2 M-J and 0.83 +/- 0.03 R-J, respectively, corresponding to a mean density of 108(-13)(+15) g cm(-3). Conclusions. 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 similar to 0.3 M-J to the turn-over to hydrogen burning stars at similar to 73 M-J. EPIC 212036875 b falls close to the theoretical model for mature H/He dominated objects in this diagram as determined by interior structure models. 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 (Q(star)' greater than or similar to 10(8)), which implies a circularisation timescale of greater than or similar to 23 Gyr, or suggests an interaction between the magnetic and tidal forces of the star and the brown dwarf.

Návaznosti

EF16_027/0008360, projekt VaV

Název: Postdoc@MUNI

Citovat

PERSSON, Carina M., Szilard CSIZMADIA, Alexander J. MUSTILL, Malcolm FRIDLUND, Artie P. HATZES, Grzegorz NOWAK, Iskra GEORGIEVA, Davide GANDOLFI, Melvyn B. DAVIES, John H. LIVINGSTON, Enric PALLE, Pilar RODRIGUEZ, Michael ENDL, Teruyuki HIRANO, Jorge PRIETO-ARRANZ, Judith KORTH, Sascha GRZIWA, Massimiliano ESPOSITO, Simon ALBRECHT, Marshall C. JOHNSON, Oscar BARRAGAN, Hannu PARVIAINEN, Eylen Vincent VAN, Roi SOBRINO, Paul G. BECK, Juan CABRERA, Ilaria CARLEO, William D. COCHRAN, Fei DAI, Hans J. DEEG, Jerome P. DE LEON, Philipp EIGMULLER, Anders ERIKSON, Akai FUKUI, Lucia GONZALEZ-CUESTA, Eike W. GUENTHER, Diego HIDALGO, Maria HJORTH, Petr KABÁTH, Emil KNUDSTRUP, Nobuhiko KUSAKABE, Kristine W. F. LAM, Mikkel N. LUND, Rafael LUQUE, Savita MATHUR, Felipe MURGAS, Norio NARITA, David NESPRAL, Prajwal NIRAULA, A. O. Henrik OLOFSSON, Martin PATZOLD, Heike RAUER, Seth REDFIELD, Ignasi RIBAS, Marek SKARKA, Alexis M. S. SMITH, Jan SUBJAK a Motohide TAMURA. Greening of the brown-dwarf desert EPIC 212036875b: a 51 M-J object in a 5-day orbit around an F7V star. ASTRONOMY & ASTROPHYSICS. Les Ulis: EDP SCIENCES S A, 2019, roč. 628, AUG, s. 1-14. ISSN 1432-0746. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201935505.

@article{1596982,
   author = {Persson, Carina M. and Csizmadia, Szilard and Mustill, Alexander J. and Fridlund, Malcolm and Hatzes, Artie P. and Nowak, Grzegorz and Georgieva, Iskra and Gandolfi, Davide and Davies, Melvyn B. and Livingston, John H. and Palle, Enric and Rodriguez, Pilar and Endl, Michael and Hirano, Teruyuki and PrietoandArranz, Jorge and Korth, Judith and Grziwa, Sascha and Esposito, Massimiliano and Albrecht, Simon and Johnson, Marshall C. and Barragan, Oscar and Parviainen, Hannu and Van, Eylen Vincent and Sobrino, Roi and Beck, Paul G. and Cabrera, Juan and Carleo, Ilaria and Cochran, William D. and Dai, Fei and Deeg, Hans J. and de Leon, Jerome P. and Eigmuller, Philipp and Erikson, Anders and Fukui, Akai and GonzalezandCuesta, Lucia and Guenther, Eike W. and Hidalgo, Diego and Hjorth, Maria and Kabáth, Petr and Knudstrup, Emil and Kusakabe, Nobuhiko and Lam, Kristine W. F. and Lund, Mikkel N. and Luque, Rafael and Mathur, Savita and Murgas, Felipe and Narita, Norio and Nespral, David and Niraula, Prajwal and Olofsson, A. O. Henrik and Patzold, Martin and Rauer, Heike and Redfield, Seth and Ribas, Ignasi and Skarka, Marek and Smith, Alexis M. S. and Subjak, Jan and Tamura, Motohide},
   article_location = {Les Ulis},
   article_number = {AUG},
   doi = {http://dx.doi.org/10.1051/0004-6361/201935505},
   keywords = {planetary systems; stars: fundamental parameters; stars: individual: EPIC 212036875; techniques: photometric; techniques: radial velocities},
   language = {eng},
   issn = {1432-0746},
   journal = {ASTRONOMY & ASTROPHYSICS},
   title = {Greening of the brown-dwarf desert EPIC 212036875b: a 51 M-J object in a 5-day orbit around an F7V star},
   url = {https://arxiv.org/abs/1906.05048},
   volume = {628},
   year = {2019}
}

TY  - JOUR
ID  - 1596982
AU  - Persson, Carina M. - Csizmadia, Szilard - Mustill, Alexander J. - Fridlund, Malcolm - Hatzes, Artie P. - Nowak, Grzegorz - Georgieva, Iskra - Gandolfi, Davide - Davies, Melvyn B. - Livingston, John H. - Palle, Enric - Rodriguez, Pilar - Endl, Michael - Hirano, Teruyuki - Prieto-Arranz, Jorge - Korth, Judith - Grziwa, Sascha - Esposito, Massimiliano - Albrecht, Simon - Johnson, Marshall C. - Barragan, Oscar - Parviainen, Hannu - Van, Eylen Vincent - Sobrino, Roi - Beck, Paul G. - Cabrera, Juan - Carleo, Ilaria - Cochran, William D. - Dai, Fei - Deeg, Hans J. - de Leon, Jerome P. - Eigmuller, Philipp - Erikson, Anders - Fukui, Akai - Gonzalez-Cuesta, Lucia - Guenther, Eike W. - Hidalgo, Diego - Hjorth, Maria - Kabáth, Petr - Knudstrup, Emil - Kusakabe, Nobuhiko - Lam, Kristine W. F. - Lund, Mikkel N. - Luque, Rafael - Mathur, Savita - Murgas, Felipe - Narita, Norio - Nespral, David - Niraula, Prajwal - Olofsson, A. O. Henrik - Patzold, Martin - Rauer, Heike - Redfield, Seth - Ribas, Ignasi - Skarka, Marek - Smith, Alexis M. S. - Subjak, Jan - Tamura, Motohide
PY  - 2019
TI  - Greening of the brown-dwarf desert EPIC 212036875b: a 51 M-J object in a 5-day orbit around an F7V star
JF  - ASTRONOMY & ASTROPHYSICS
VL  - 628
IS  - AUG
SP  - 1-14
EP  - 1-14
PB  - EDP SCIENCES S A
SN  - 14320746
KW  - planetary systems
KW  - stars: fundamental parameters
KW  - stars: individual: EPIC 212036875
KW  - techniques: photometric
KW  - techniques: radial velocities
UR  - https://arxiv.org/abs/1906.05048
L2  - https://arxiv.org/abs/1906.05048
N2  - Context. Although more than 2000 brown dwarfs have been detected to date, mainly from direct imaging, their characterisation is difficult due to their faintness and model-dependent results. In the case of transiting brown dwarfs, however, it is possible to make direct high-precision observations. Aims. Our aim is to investigate the nature and formation of brown dwarfs by adding a new well-characterised object, in terms of its mass, radius and bulk density, to the currently small sample of less than 20 transiting brown dwarfs. Methods. 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 multicolour photometric observations, imaging, and radial velocity measurements to rule out false positive scenarios and to determine the fundamental properties of the system. Results. 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-circle dot, a stellar radius of 1.41 +/- 0.05 R-circle dot, and an age of 5.1 +/- 0.9 Gyr. The mass and radius of the companion brown dwarf are 51 +/- 2 M-J and 0.83 +/- 0.03 R-J, respectively, corresponding to a mean density of 108(-13)(+15) g cm(-3). Conclusions. 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 similar to 0.3 M-J to the turn-over to hydrogen burning stars at similar to 73 M-J. EPIC 212036875 b falls close to the theoretical model for mature H/He dominated objects in this diagram as determined by interior structure models. 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 (Q(star)' greater than or similar to 10(8)), which implies a circularisation timescale of greater than or similar to 23 Gyr, or suggests an interaction between the magnetic and tidal forces of the star and the brown dwarf.
ER  -

PERSSON, Carina M., Szilard CSIZMADIA, Alexander J. MUSTILL, Malcolm FRIDLUND, Artie P. HATZES, Grzegorz NOWAK, Iskra GEORGIEVA, Davide GANDOLFI, Melvyn B. DAVIES, John H. LIVINGSTON, Enric PALLE, Pilar RODRIGUEZ, Michael ENDL, Teruyuki HIRANO, Jorge PRIETO-ARRANZ, Judith KORTH, Sascha GRZIWA, Massimiliano ESPOSITO, Simon ALBRECHT, Marshall C. JOHNSON, Oscar BARRAGAN, Hannu PARVIAINEN, Eylen Vincent VAN, Roi SOBRINO, Paul G. BECK, Juan CABRERA, Ilaria CARLEO, William D. COCHRAN, Fei DAI, Hans J. DEEG, Jerome P. DE LEON, Philipp EIGMULLER, Anders ERIKSON, Akai FUKUI, Lucia GONZALEZ-CUESTA, Eike W. GUENTHER, Diego HIDALGO, Maria HJORTH, Petr KABÁTH, Emil KNUDSTRUP, Nobuhiko KUSAKABE, Kristine W. F. LAM, Mikkel N. LUND, Rafael LUQUE, Savita MATHUR, Felipe MURGAS, Norio NARITA, David NESPRAL, Prajwal NIRAULA, A. O. Henrik OLOFSSON, Martin PATZOLD, Heike RAUER, Seth REDFIELD, Ignasi RIBAS, Marek SKARKA, Alexis M. S. SMITH, Jan SUBJAK a Motohide TAMURA. Greening of the brown-dwarf desert EPIC 212036875b: a 51 M-J object in a 5-day orbit around an F7V star. \textit{ASTRONOMY \&{} ASTROPHYSICS}. Les Ulis: EDP SCIENCES S A, 2019, roč.~628, AUG, s.~1-14. ISSN~1432-0746. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201935505.

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