Two New HATNet Hot Jupiters around A Stars and the First Glimpse at the Occurrence Rate of Hot Jupiters from TESS

October 2019 • 2019AJ....158..141Z

Authors • Zhou, G. • Huang, C. X. • Bakos, G. Á. • Hartman, J. D. • Latham, David W. • Quinn, S. N. • Collins, K. A. • Winn, J. N. • Wong, I. • Kovács, G. • Csubry, Z. • Bhatti, W. • Penev, K. • Bieryla, A. • Esquerdo, G. A. • Berlind, P. • Calkins, M. L. • de Val-Borro, M. • Noyes, R. W. • Lázár, J. • Papp, I. • Sári, P. • Kovács, T. • Buchhave, Lars A. • Szklenar, T. • Béky, B. • Johnson, M. C. • Cochran, W. D. • Kniazev, A. Y. • Stassun, K. G. • Fulton, B. J. • Shporer, A. • Espinoza, N. • Bayliss, D. • Everett, M. • Howell, S. B. • Hellier, C. • Anderson, D. R. • Collier Cameron, A. • West, R. G. • Brown, D. J. A. • Schanche, N. • Barkaoui, K. • Pozuelos, F. • Gillon, M. • Jehin, E. • Benkhaldoun, Z. • Daassou, A. • Ricker, G. • Vanderspek, R. • Seager, S. • Jenkins, J. M. • Lissauer, Jack J. • Armstrong, J. D. • Collins, K. I. • Gan, T. • Hart, R. • Horne, K. • Kielkopf, J. F. • Nielsen, L. D. • Nishiumi, T. • Narita, N. • Palle, E. • Relles, H. M. • Sefako, R. • Tan, T. G. • Davies, M. • Goeke, Robert F. • Guerrero, N. • Haworth, K. • Villanueva, S.

Abstract • Wide-field surveys for transiting planets are well suited to searching diverse stellar populations, enabling a better understanding of the link between the properties of planets and their parent stars. We report the discovery of HAT-P-69 b (TOI 625.01) and HAT-P-70 b (TOI 624.01), two new hot Jupiters around A stars from the Hungarian-made Automated Telescope Network (HATNet) survey that have also been observed by the Transiting Exoplanet Survey Satellite. HAT-P-69 b has a mass of {3.58}-0.58+0.58 M Jup and a radius of {1.676}-0.033+0.051 R Jup and resides in a prograde 4.79 day orbit. HAT-P-70 b has a radius of {1.87}-0.10+0.15 R Jup and a mass constraint of < 6.78 (3σ ) M Jup and resides in a retrograde 2.74 day orbit. We use the confirmation of these planets around relatively massive stars as an opportunity to explore the occurrence rate of hot Jupiters as a function of stellar mass. We define a sample of 47,126 main-sequence stars brighter than T mag = 10 that yields 31 giant planet candidates, including 18 confirmed planets, 3 candidates, and 10 false positives. We find a net hot Jupiter occurrence rate of 0.41 ± 0.10% within this sample, consistent with the rate measured by Kepler for FGK stars. When divided into stellar mass bins, we find the occurrence rate to be 0.71 ± 0.31% for G stars, 0.43 ± 0.15% for F stars, and 0.26 ± 0.11% for A stars. Thus, at this point, we cannot discern any statistically significant trend in the occurrence of hot Jupiters with stellar mass.

Based on observations obtained with the Hungarian-made Automated Telescope Network. Based in part on observations obtained with the Tillinghast Reflector 1.5 m telescope and the 1.2 m telescope, both operated by the Smithsonian Astrophysical Observatory at the Fred Lawrence Whipple Observatory in Arizona. This work makes use of the Smithsonian Institution High Performance Cluster (SI/HPC). Based in part on observations made with the Southern African Large Telescope (SALT).


IPAC Authors


Benjamin Fulton

Assistant Scientist