Two new HATNet hot Jupiters around A stars, and the first glimpse at the occurrence rate of hot Jupiters from TESS

• Published in: arXiv.org 2019-07
• Main 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, M de Val-Borro, Noyes, R W, Lázár, J, Papp, I, Sári, P, Kovács, T, Buchhave, Lars A, Szklenár, T, Beky, 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, A Collier Cameron, 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
• Format: Article
• Language: English
• Subjects: A stars; Extrasolar planets; F stars; G stars; Gas giant planets; Jupiter; Main sequence stars; Massive stars; Planet detection; Stellar mass; Stellar populations; Stellar systems; Transit
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1906.00462

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-69b (TOI 625.01) and HAT-P-70b (TOI 624.01), two new hot Jupiters around A stars from the HATNet survey which have also been observed by the Transiting Exoplanet Survey Satellite (TESS). HAT-P-69b has a mass of 3.58 +0.58/-0.58 MJup and a radius of 1.676 +0.051/-0.033 RJup, residing in a prograde 4.79-day orbit. HAT-P-70b has a radius of 1.87 +0.15/-0.10 RJup and a mass constraint of < 6.78 (3 sigma) MJup, 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 Tmag=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.