HATS-37Ab and HATS-38b: Two Transiting Hot Neptunes in the Desert

Jordan, A. and Bakos, G. A. and Bayliss, D. and Bento, J. and Bhatti, W. and Brahm, R. and Csubry, Z. and Espinoza, N. and Hartman, J. D. and Henning, Th. and Mancini, L. and Penev, K. and Rabus, M. and Sarkis, P. and Suc, V. and de Val-Borro, M. and Zhou, G. ORCID: https://orcid.org/0000-0002-4891-3517 and Butler, R. P. and Teske, J. and Crane, J. and Shectman, S. and Tan, T. G. and Thompson, I. and Wallace, J. J. and Lazar, J. and Papp, I. and Sari, P. (2020) HATS-37Ab and HATS-38b: Two Transiting Hot Neptunes in the Desert. The Astronomical Journal, 160 (5):222. pp. 1-14. ISSN 0004-6256

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We report the discovery of two transiting Neptunes by the HATSouth survey. The planet HATS-37Ab has a mass of 0.099 ± 0.042 MJ (31.5 ± 13.4 M) and a radius of 0.606 ± 0.016 RJ, and is on a P = 4.3315 day orbit around a V = 12.266 ± 0.030 mag, 0.843-+0.0120.017 M☉ star with a radius of 0.877-+0.0120.019 R☉. We also present evidence that the star HATS-37A has an unresolved stellar companion HATS-37B, with a photometrically estimated mass of 0.654 ± 0.033 M☉. The planet HATS-38b has a mass of 0.074 ± 0.011 MJ (23.5 ± 3.5 M) and a radius of 0.614 ± 0.017 RJ, and is on a P = 4.3750 day orbit around a V = 12.411 ± 0.030 mag, 0.890-+0.0120.016 M☉ star with a radius of 1.105 ± 0.016 R☉. Both systems appear to be old, with isochrone-based ages of 11.46-+1.450.79 Gyr, and 11.89 ± 0.60 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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 10 Feb 2022 04:46
Last Modified: 14 Feb 2022 02:18
Uncontrolled Keywords: Exoplanets; Hot Neptunes; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.3847/1538-3881/aba530
URI: http://eprints.usq.edu.au/id/eprint/44998

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