HATS-37Ab and HATS-38b: Two Transiting Hot Neptunes in the Desert
/ Authors
A. Jord'an, G. Bakos, D. Bayliss, J. Bento, W. Bhatti, R. Brahm, Z. Csubry, N. Espinoza, J. Hartman, T. Henning
and 17 more authors
L. Mancini, K. Penev, M. Rabus, P. Sarkis, V. Suc, Miguel de Val-Borro, G. Zhou, R. P. Butler, J. Teske, J. Crane, S. Shectman, T. Tan, I. Thompson, J. Wallace, J. L'az'ar, I. Papp, P. S'ari
/ Abstract
We report the discovery of two transiting Neptunes by the HATSouth survey. The planet HATS-37Ab has a mass of (31.5 ± 13.4 M⊕) and a radius of , and is on a day orbit around a mag, star with a radius of . We also present evidence that the star HATS-37A has an unresolved stellar companion HATS-37B, with a photometrically estimated mass of . The planet HATS-38b has a mass of (23.5 ± 3.5 M⊕) and a radius of , and is on a day orbit around a mag, star with a radius of . Both systems appear to be old, with isochrone-based ages of Gyr, and Gyr, respectively. Both HATS-37Ab and HATS-38b lie in the Neptune desert and are thus examples of a population with a low occurrence rate. They are also among the lowest-mass planets found from ground-based wide-field surveys to date.
Journal: The Astronomical Journal