KELT-24b: A 5M(J) Planet on a 5.6 day Well-aligned Orbit around the Young V=8.3 F-star HD 93148

Autor(es):Mostrar menos -

Rodriguez, Joseph E. ^[1] ; Eastman, Jason D. ^[1] ; Zhou, George ^[1] ; Quinn, Samuel N. ^[1] ; Beatty, Thomas G. ^[2] ; Penev, Kaloyan ^[3] ; Johnson, Marshall C. ^[4] ; Cargile, Phillip A. ^[1] ; Latham, David W. ^[1] ; Bieryla, Allyson ^[1] ; Collins, Karen A. ^[1] ; Dressing, Courtney D. ^[5] ; Ciardi, David R. ^[6] ; Relles, Howard M. ^[1] ; Murawski, Gabriel ^[7] ; Nishiumi, Taku ^{[8, 9]} ; Yonehara, Atsunori ^[9] ; Ishimaru, Ryo ^[10] ; Yoshida, Fumi ^[10] ; Gregorio, Joao ^{[11, 12]} ; Lund, Michael B. ^[6] ; Stevens, Daniel J. ^{[13, 14]} ; Stassun, Keivan G. ^{[15, 16]} ; Gaudi, B. Scott ^[4] ; Colon, Knicole D. ^[17] ; Pepper, Joshua ^[18] ; Narita, Norio ^{[8, 19, 20, 21]} ; Awiphan, Supachai ^[22] ; Chuanraksasat, Pongpichit ^[22] ; Benni, Paul ^[23] ; Zambelli, Roberto ^[24] ; Garrison, Lehman H. ^[1] ; Wilson, Maurice L. ^[1] ; Cornachione, Matthew A. ^{[25, 26]} ; Wang, Sharon X. ^[27] ; Labadie-Bartz, Jonathan ^[28] ; Rodriguez, Romy ^[4] ; Siverd, Robert J. ^[15] ; Yao, Xinyu ^[18] ; Bayliss, Daniel ^{[29, 30]} ; Berlind, Perry ^[1] ; Calkins, Michael L. ^[1] ; Christiansen, Jessie L. ^[6] ; Cohen, David H. ^[31] ; Conti, Dennis M. ^[32] ; Curtis, Ivan A. ^[33] ; Depoy, D. L. ^{[34, 35]} ; Esquerdo, Gilbert A. ^[1] ; Evans, Phil ^[36] ; Feliz, Dax ^[15] ; Fulton, Benjamin J. ^[6] ; Holoien, Thomas W. S. ^[37] ; James, David J. ^{[38, 1]} ; Jayasinghe, Tharindu ^[4] ; Jang-Condell, Hannah ^[39] ; Jensen, Eric L. N. ^[31] ; Johnson, John A. ^[1] ; Joner, Michael D. ^[40] ; Khakpash, Somayeh ^[18] ; Kielkopf, John F. ^[41] ; Kuhn, Rudolf B. ^{[42, 43]} ; Manner, Mark ^[44] ; Marshall, Jennifer L. ^{[34, 35]} ; McLeod, Kim K. ^[45] ; McCrady, Nate ^[46] ; Oberst, Thomas E. ^[47] ; Oelkers, Ryan J. ^[15] ; Penny, Matthew T. ^[4] ; Reed, Phillip A. ^[48] ; Sliski, David H. ^[49] ; Shappee, B. J. ^[50] ; Stephens, Denise C. ^[40] ; Stockdale, Chris ^[51] ; Tan, Thiam-Guan ^[52] ; Trueblood, Mark ^[53] ; Trueblood, Pat ^[53] ; Villanueva, Jr., Steven ^{[54, 55]} ; Wittenmyer, Robert A. ^[56] ; Wright, Jason T. ^{[13, 14]}

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

^[1] Ctr Astrophys Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02138 - USA

^[2] Univ Arizona, Dept Astron & Steward Observ, Tucson, AZ 85721 - USA

^[3] Univ Texas Dallas, Dept Phys, 800 West Campbell Rd, Richardson, TX 75080 - USA

^[4] Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 - USA

^[5] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 - USA

^[6] CALTECH, IPAC, NASA, Exoplanet Sci Inst, 1200 E Calif Ave, Pasadena, CA 91125 - USA

^[7] Gabriel Murawski Private Observ SOTES, Suwalki - Poland

^[8] Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588 - Japan

^[9] Kyoto Sangyo Univ, Fac Sci, Dept Phys, Kita Ku, Kyoto 6038555 - Japan

^[10] Chiba Inst Technol, Planetary Explorat Res Ctr, 2-17-1 Tsudanuma, Narashino, Chiba 2750016 - Japan

^[11] Atalaia Grp, Portalegre - Portugal

^[12] CROW Observ, Portalegre - Portugal

^[13] Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 - USA

^[14] Penn State Univ, Ctr Exoplanets & Habitable Worlds, 525 Davey Lab, University Pk, PA 16802 - USA

^[15] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 - USA

^[16] Fisk Univ, Dept Phys, 1000 17th Ave North, Nashville, TN 37208 - USA

^[17] NASA, Goddard Space Flight Ctr, Exoplanets & Stellar Astrophys Lab, Code 667, Greenbelt, MD 20771 - USA

^[18] Lehigh Univ, Dept Phys, 16 Mem Dr East, Bethlehem, PA 18015 - USA

^[19] IAC, E-38205 Tenerife - Spain

^[20] Astrobiol Ctr, 2-21-1 Osawa, Mitaka, Tokyo 1818588 - Japan

^[21] JST, PRESTO, 2-21-1 Osawa, Mitaka, Tokyo 1818588 - Japan

^[22] Natl Astron Res Inst Thailand, 260, Moo 4, Chiang Mai 50180 - Thailand

^[23] Acton Sky Portal Private Observ, Acton, MA 01720 - USA

^[24] Soc Astron Lunae, Sarzana - Italy

^[25] Univ Utah, Dept Phys & Astron, 115 South 1400 East, Salt Lake City, UT 84112 - USA

^[26] US Naval Acad, Dept Phys, 572C Holloway Rd, Annapolis, MD 21402 - USA

^[27] Carnegie Inst Sci, Dept Terr Magnetism, 5241 Broad Branch Rd NW, Washington, DC 20015 - USA

^[28] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226, Cidade Univ, BR-05508900 Sao Paulo, SP - Brazil

^[29] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands - England

^[30] Univ Warwick, Ctr Exoplanets & Habitabil, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands - England

^[31] Swarthmore Coll, Dept Phys & Astron, Swarthmore, PA 19081 - USA

^[32] Amer Assoc Variable Star Observers, 49 Bay State Rd, Cambridge, MA 02138 - USA

^[33] Ivan Curtis Private Observ, Toowoomba, Qld - Australia

^[34] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 - USA

^[35] Texas A&M Univ, George P & Cynthia Woods Mitchell Inst Fundamenta, College Stn, TX 77843 - USA

^[36] El Sauce Observ, Rio Hurtado, Coquimbo - Chile

^[37] Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 - USA

^[38] Harvard Univ, Black Hole Initiat, 20 Garden St, Cambridge, MA 02138 - USA

^[39] Univ Wyoming, Dept Phys & Astron, 1000 E Univ Ave, Dept 3905, Laramie, WY 82071 - USA

^[40] Brigham Young Univ, Dept Phys & Astron, Provo, UT 84602 - USA

^[41] Univ Louisville, Dept Phys & Astron, Louisville, KY 40292 - USA

^[42] South African Astron Observ, POB 9, ZA-7935 Cape Town - South Africa

^[43] Southern African Large Telescope, POB 9, ZA-7935 Cape Town - South Africa

^[44] Spot Observ, Nashville, TN 37206 - USA

^[45] Wellesley Coll, Dept Astron, Wellesley, MA 02481 - USA

^[46] Univ Montana, Dept Phys & Astron, 32 Campus Dr, 1080, Missoula, MT 59812 - USA

^[47] Westminster Coll, Dept Phys, New Wilmington, PA 16172 - USA

^[48] Kutztown State Univ, Dept Phys Sci, Kutztown, PA 19530 - USA

^[49] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 - USA

^[50] Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 - USA

^[51] Hazelwood Observ, Churchill, Vic - Australia

^[52] Perth Exoplanet Survey Telescope, Perth, WA - Australia

^[53] Winer Observ, POB 797, Sonoita, AZ 85637 - USA

^[54] MIT, Dept Phys, Cambridge, MA 02139 - USA

^[55] MIT, Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 - USA

^[56] Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350 - Australia

• Tipo de documento: Artigo Científico
• Fonte: ASTRONOMICAL JOURNAL; v. 158, n. 5 NOV 2019.
• Citações Web of Science: 0

Resumo

We present the discovery of KELT-24 b, a massive hot Jupiter orbiting a bright (V = 8.3 mag, K = 7.2 mag) young F-star with a period of 5.6 days. The host star, KELT-24 (HD 93148), has a T-eff = 6509(-49)(+50) K, a mass of M-{*} = 1.460(-0.059)(+0.055) M-circle dot, a radius of R-{*} = 1.506 +/- 0.022 R-circle dot, and an age of 0.78(-0.42)(+0.61) Gyr. Its planetary companion (KELT-24 b) has a radius of R-P = 1.272 +/- 0.021 R-J and a mass of M-P = 5.18(-0.22)(+0.21) M-J, and from Doppler tomographic observations, we find that the planet's orbit is well-aligned to its host star's projected spin axis (lambda = 2.6(-3.6)(+5.1)). The young age estimated for KELT-24 suggests that it only recently started to evolve from the zero-age main sequence. KELT-24 is the brightest star known to host a transiting giant planet with a period between 5 and 10 days. Although the circularization timescale is much longer than the age of the system, we do not detect a large eccentricity or significant misalignment that is expected from dynamical migration. The brightness of its host star and its moderate surface gravity make KELT-24b an intriguing target for detailed atmospheric characterization through spectroscopic emission measurements since it would bridge the current literature results that have primarily focused on lower mass hot Jupiters and a few brown dwarfs. (AU)

• Processo FAPESP: 17/23731-1 - Análise e Modelagem de uma Grande Amostra de Estrelas Be Galácticas
• Beneficiário: Jonathan Michael Labadie-Bartz
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado