HATS-25b through HATS-30b: A Half-dozen New Inflated Transiting Hot Jupiters from the HATSouth Survey
| Autor: | J. Bento, Andrés Jordán, Markus Rabus, Daniel Bayliss, M. de Val-Borro, Thiam-Guan Tan, George Zhou, Luigi Mancini, Vincent Suc, Th. Henning, C. G. Tinney, Néstor Espinoza, Kaloyan Penev, Joel D. Hartman, Waqas Bhatti, Brian P. Schmidt, R. W. Noyes, Rafael Brahm, Z. Csubry, Gáspár Á. Bakos, S. Ciceri, Duncan J. Wright |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Earth and Planetary Astrophysics (astro-ph.EP) Brightness 010504 meteorology & atmospheric sciences FOS: Physical sciences Astronomy and Astrophysics Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Exoplanet Dozen Stars Orbit Settore FIS/05 - Astronomia e Astrofisica Space and Planetary Science Planet 0103 physical sciences Hot Jupiter Astrophysics::Earth and Planetary Astrophysics 010303 astronomy & astrophysics 0105 earth and related environmental sciences Astrophysics - Earth and Planetary Astrophysics |
| Popis: | 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 $\sim 12-14$ 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 $1.75 R_J$. 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 ($v \sin i \approx 9.3$ km/s) 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. Accepted for publication in the Astronomical Journal |
| Databáze: | OpenAIRE |
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