KELT-24b: A 5M(J) Planet on a 5.6 day Well-aligned Orbit around the Young V=8.3 F-star HD 93148
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 Teff=-+65094950K, a mass of M*=+1.4600.0590.055Me, a radius of R*=1.506±0.022Re, and an age of +0.780.420.61Gyr. Its...
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Published in | The Astronomical journal Vol. 158; no. 5 |
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Main Authors | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
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Goddard Space Flight Center
The American Astronomical Society
23.10.2019
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Abstract | 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 Teff=-+65094950K, a mass of M*=+1.4600.0590.055Me, a radius of R*=1.506±0.022Re, and an age of +0.780.420.61Gyr. Its planetary companion (KELT-24 b) has a radius of RP=1.272±0.021RJ and a mass of MP=-+5.180.220.21MJ, and from Doppler tomographic observations, we find that the planet’s orbit is well aligned to its host star’s projected spin axis (l=-+2.63.65.1). 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. |
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AbstractList | 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 Teff=-+65094950K, a mass of M*=+1.4600.0590.055Me, a radius of R*=1.506±0.022Re, and an age of +0.780.420.61Gyr. Its planetary companion (KELT-24 b) has a radius of RP=1.272±0.021RJ and a mass of MP=-+5.180.220.21MJ, and from Doppler tomographic observations, we find that the planet’s orbit is well aligned to its host star’s projected spin axis (l=-+2.63.65.1). 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. |
Audience | PUBLIC |
Author | Jensen, Eric L. N. Wang, Sharon X. Johnson, John A. Wilson, Maurice L. Joner, Michael D. Latham, David W. Jang-condell, Hannah Holoien, Thomas W.-S. Kielkopf, John F. Depoy, D. L. Oberst, Thomas E. Murawski, Gabriel Jr, Steven Villanueva Wittenmyer, Robert A. Beatty, Thomas G. Gregorio, Joao Trueblood, Mark Stephens, Denise C. Rodríguez, Romy James, David J. Yonehara, Atsunori Garrison, Lehman H. Christiansen, Jessie L. Stevens, Daniel J. Trueblood, Pat Kuhn, Rudolf B. Sliski, David H. Manner, Mark Shappee, B. J. Eastman, Jason D. Zambelli, Roberto Penny, Matthew T. Cargile, Phillip A. Collins, Karen A. Calkins, Michael L. Tan, Thiam-Guan Cohen, David H Phil Evans35 Dressing, Courtney Khakpash, Somayeh Siverd, Robert J. Narita, Norio Reed, Phillip A. Ishimaru, Ryo Lund, Michael B. Zhou, George Feliz, Dax Marshall, Jennifer L. Benni, Paul Oelkers, Ryan J. Gaudi, B. Scott Colon, Knicole McCrady, Nate Esquerdo, Gilbert A. Wright, Jason T. Nishiumi, Taku Bayliss, Daniel Yoshida, Fumi Berlind, Perry Quinn, Samuel N. Penev, Kaloyan Stassun, Keivan G. C |
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Snippet | 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,... |
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Title | KELT-24b: A 5M(J) Planet on a 5.6 day Well-aligned Orbit around the Young V=8.3 F-star HD 93148 |
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