HATS-15b and HATS-16b: Two Massive Planets Transiting Old G Dwarf Stars
/ Authors
S. Ciceri, L. Mancini, T. Henning, G. Bakos, K. Penev, R. Brahm, G. Zhou, J. Hartman, D. Bayliss, A. Jord'an
and 21 more authors
Z. Csubry, Miguel de Val-Borro, W. Bhatti, M. Rabus, N. Espinoza, V. Suc, B. Schmidt, R. Noyes, A. Howard, B. Fulton, H. Isaacson, G. Marcy, R. P. Butler, P. Arriagada, J. Crane, S. Shectman, I. Thompson, T. Tan, J. L'az'ar, I. Papp, P. Sári
/ Abstract
We report the discovery of HATS-15 b and HATS-16 b, two massive transiting extrasolar planets orbiting evolved (∼10 Gyr) main-sequence stars. The planet HATS-15 b, which is hosted by a G9 V star ( V = 14.8 mag), is a hot Jupiter with mass of 2.17 ± 0.15 M J and radius of 1.105 ± 0.040 R J , and it completes its orbit in about 1.7 days. HATS-16 b is a very massive hot Jupiter with mass of 3.27 ± 0.19 M J and radius of 1.30 ± 0.15 R J ; it orbits around its G3 V parent star ( V = 13.8 mag) in ∼2.7 days. HATS-16 is slightly active and shows a periodic photometric modulation, implying a rotational period of 12 days, which is unexpectedly short given its isochronal age. This fast rotation might be the result of the tidal interaction between the star and its planet.
Journal: Publications of the Astronomical Society of the Pacific