Two New HATNet Hot Jupiters around A Stars and the First Glimpse at the Occurrence Rate of Hot Jupiters from TESS
Latham, David W.; Narita, N.; Cochran, W. D.; Palle, E.; Winn, J. N.; Lissauer, Jack J.; Horne, K.; Buchhave, Lars A.; Collier Cameron, A.; Collins, K. A.; Collins, K. I.; Gillon, M.; Jenkins, J. M.; Seager, S.; Jehin, E.; Daassou, A.; Barkaoui, K.; Benkhaldoun, Z.; Bieryla, A.; Ricker, G.; Vanderspek, R.; Sefako, R.; Huang, C. X.; Anderson, D. R.; Hellier, C.; West, R. G.; Berlind, P.; Nishiumi, T.; Espinoza, N.; Stassun, K. G.; Goeke, Robert F.; Hart, R.; Kielkopf, J. F.; Bhatti, W.; Guerrero, N.; Howell, S. B.; de Val-Borro, M.; Kniazev, A. Y.; Fulton, B. J.; Zhou, G.; Villanueva, S.; Nielsen, L. D.; Bayliss, D.; Brown, D. J. A.; Quinn, S. N.; Shporer, A.; Tan, T. G.; Bakos, G. Á.; Hartman, J. D.; Csubry, Z.; Penev, K.; Papp, I.; Schanche, N.; Lázár, J.; Sári, P.; Gan, T.; Relles, H. M.; Wong, I.; Noyes, R. W.; Pozuelos, F.; Kovács, G.; Esquerdo, G. A.; Calkins, M. L.; Kovács, T.; Szklenar, T.; Béky, B.; Johnson, M. C.; Everett, M.; Armstrong, J. D.; Davies, M.; Haworth, K.
United States, Hungary, Denmark, South Africa, Germany, Chile, United Kingdom, Belgium, Morocco, China, Australia, Switzerland, Japan, Spain
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).