HATS-25b through HATS-30b: a half-dozen new inflated transiting hot jupiters from the HATSouth survey

Espinoza, N. and Bayliss, D. and Hartman, J. D. and Bakos, G. A. and Jordan, A. and Zhou, G. and Mancini, L. and Brahm, R. and Ciceri, S. and Bhatti, W. and Csubry, Z. and Rabus, M. and Penev, K. and Bento, J. and de Val-Borro, M. and Henning, T. and Schmidt, B. and Suc, V. and Wright, D. J. and Tinney, C. G. and Tan, T. G. and Noyes, R. (2016) HATS-25b through HATS-30b: a half-dozen new inflated transiting hot jupiters from the HATSouth survey. The Astronomical Journal, 152 (4):108. pp. 1-18. ISSN 0004-6256


Abstract

We report six new inflated hot Jupiters (HATS-25b through HATS-30b) discovered using the HATSouth global network of automated telescopes. The planets orbit stars with V magnitudes in the range of similar to 12-14 and have masses in the largely populated 0.5M(J)-0.7M(J) region of parameter space but span a wide variety of radii, from 1.17R(J) to 1.75R(J). HATS-25b, HATS-28b, HATS-29b, and HATS-30b are typical inflated hot Jupiters (R-p = 1.17-1.26R(J)) orbiting G-type stars in short period (P = 3.2-4.6 days) orbits. However, HATS-26b (R-p = 1.75R(J), P = 3.3024 days) and HATS-27b (R-p = 1.50R(J), P = 4.6370 days) stand out as highly inflated planets orbiting slightly evolved F stars just after and in the turn-off points, respectively, which are among the least dense hot Jupiters, with densities of 0.153 g cm(-3) and 0.180 g cm(-3), respectively. All the presented exoplanets but HATS-27b are good targets for future atmospheric characterization studies, while HATS-27b is a prime target for Rossiter-McLaughlin monitoring in order to determine its spin-orbit alignment given the brightness (V = 12.8) and stellar rotational velocity (v sin i approximate to 9.3 km s(-1)) of the host star. These discoveries significantly increase the number of inflated hot Jupiters known, contributing to our understanding of the mechanism(s) responsible for hot Jupiter inflation.


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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: 09 Sep 2019 00:18
Last Modified: 27 May 2021 23:22
Uncontrolled Keywords: stars, HATS-25, HATS-26, HATS-27, HATS-28, HATS-29, HATS-30
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
Identification Number or DOI: https://doi.org/10.3847/0004-6256/152/4/108
URI: http://eprints.usq.edu.au/id/eprint/36376

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