K2-139 b: a low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star

Autor(es):Mostrar menos -

Barragan, O. ^[1] ; Gandolfi, D. ^[1] ; Smith, A. M. S. ^[2] ; Deeg, H. J. ^{[3, 4]} ; Fridlund, M. C. V. ^{[5, 6]} ; Persson, C. M. ^[5] ; Donati, P. ^[7] ; Endl, M. ^{[8, 9]} ; Csizmadia, Sz. ^[2] ; Grziwa, S. ^[10] ; Nespral, D. ^{[3, 4]} ; Hatzes, A. P. ^[11] ; Cochran, W. D. ^{[8, 9]} ; Fossati, L. ^[12] ; Brems, S. S. ^[13] ; Cabrera, J. ^[2] ; Cusano, F. ^[7] ; Eigmuller, Ph. ^[1] ; Eiroa, C. ^[14] ; Erikson, A. ^[2] ; Guenther, E. ^[11] ; Korth, J. ^[10] ; Lorenzo-Oliveira, D. ^[15] ; Mancini, L. ^{[16, 17, 18]} ; Paetzold, M. ^[10] ; Prieto-Arranz, J. ^{[3, 4]} ; Rauer, H. ^{[2, 19]} ; Rebollido, I. ^[14] ; Saario, J. ^[20] ; Zakhozhay, O. V. ^{[16, 21]}

Afiliação do(s) autor(es):Mostrar menos -

^[1] Univ Torino, Dipartimento Fis, Via P Giuria 1, I-10125 Turin - Italy

^[2] German Aerosp Ctr, Inst Planetary Res, Rutherfordstr 2, D-12489 Berlin - Germany

^[3] Univ La Laguna, Dept Astrofis, E-38206 Tenerife - Spain

^[4] Inst Astrofis Canarias, E-38205 Tenerife - Spain

^[5] Chalmers Univ Technol, Onsala Space Observ, Dept Earth & Space Sci, SE-43992 Onsala - Sweden

^[6] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden - Netherlands

^[7] INAF Osservatorio Astron Bologna, Via Ranzani 1, I-20127 Bologna - Italy

^[8] Univ Texas Austin, Dept Astron, 2515 Speedway, Stop C1400, Austin, TX 78712 - USA

^[9] Univ Texas Austin, McDonald Observ, 2515 Speedway, Stop C1400, Austin, TX 78712 - USA

^[10] Univ Cologne, Rhein Inst Umweltforsch, Aachener Str 209, D-50931 Cologne - Germany

^[11] Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg - Germany

^[12] Austrian Acad Sci, Space Res Inst, A-8041 Graz - Austria

^[13] Heidelberg Univ, Zentrum Astron, Landessternwarte, Konigstuhl 12, D-69117 Heidelberg - Germany

^[14] Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid - Spain

^[15] Univ Sao Paulo, Dept Astron IAG USP, Rua Matao 1226, Cidade Univ, BR-05508900 Sao Paulo, SP - Brazil

^[16] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg - Germany

^[17] Univ Roma Tor Vergata, Dept Phys, I-00173 Rome - Italy

^[18] INAF Astrophys Observ Turin, I-10025 Turin - Italy

^[19] TU Berlin, Ctr Astron & Astrophys, Hardenbergstr 36, D-10623 Berlin - Germany

^[20] Nord Opt Telescope, Apartado 474, E-38700 Santa Cruz De La Palma - Spain

^[21] Natl Acad Sci Ukraine, Main Astron Observ, 27 Akad Zabolotnoho St, UA-03143 Kiev - Ukraine

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 475, n. 2, p. 1765-1776, APR 2018.
• Citações Web of Science: 6

Resumo

We announce the discovery of K2-139 b (EPIC 218916923 b), a transiting warm- Jupiter (T-eq = 547 +/- 25 K) on a 29-d orbit around an active (log R'(HK)= -4.46 +/- 0.06) K0V star in K2 Campaign 7. We derive the system's parameters by combining the K2 photometry with ground-based follow-up observations. With a mass of 0.387(-0.075)(+0.083) M-J and radius of 0.808(-0.033)(+0.034) R-J, K2-139 b is one of the transiting warm Jupiters with the lowest mass known to date. The planetary mean density of 0.91(-0.20)(+0.24) g cm(-3) can be explained with a core of similar to 50M circle dot. Given the brightness of the host star (V = 11.653 mag), the relatively short transit duration (similar to 5 h), and the expected amplitude of the Rossiter-McLaughlin effect (similar to 25m s(-1)), K2-139 is an ideal target to measure the spin-orbit angle of a planetary system hosting a warm Jupiter. (AU)

• Processo FAPESP: 16/20667-8 - Cronômetros estelares: a conexão entre idade, atividade cromosférica, rotação e abundâncias de lítio em estrelas de tipo solar
• Beneficiário: Diego Lorenzo de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado