HATS-8b: A low-density transiting super-Neptune
Article
Article Title | HATS-8b: A low-density transiting super-Neptune |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Bayliss, D. (Author), Hartman, J. D. (Author), Bakos, G. A. (Author), Penev, K. (Author), Zhou, G. (Author), Brahm, R. (Author), Rabus, M. (Author), Jordan, A. (Author), Mancini, L. (Author), de Val-Borro, M. (Author), Bhatti, W. (Author), Espinoza, N. (Author), Csubry, Z. (Author), Howard, A. W. (Author), Fulton, B. J. (Author), Buchhave, L. A. (Author), Henning, T. (Author), Schmidt, B. (Author), Ciceri, S. (Author), Noyes, R. W. (Author), Isaacson, H. (Author), Marcy, G. W. (Author), Suc, V. (Author), Lazar, J. (Author), Papp, I. (Author) and Sari, P. (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 150 (2), pp. 1-9 |
Article Number | 49 |
Number of Pages | 9 |
Year | 2015 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.1088/0004-6256/150/2/49 |
Web Address (URL) | https://iopscience.iop.org/article/10.1088/0004-6256/150/2/49 |
Abstract | HATS-8b is a low density transiting super-Neptune discovered as part of the HATSouth project. The planet orbits its solar-like G-dwarf host (V = 14.03 +/- 0.10, T-eff = 5679 +/- 50 K) with a period of 3.5839 days. HATS-8b is the third lowest-mass transiting exoplanet to be discovered from a wide-field ground-based search, and with a mass of 0.138 +/- 0.019 M-J it is approximately halfway between the masses of Neptune and Saturn. However, HATS-8b has a radius of 0.873(-0.075)(+0.123) R-J, resulting in a bulk density of just 0.259 +/- 0.091 g cm(-3). The metallicity of the host star is super-solar ([Fe/H] = 0.210 +/- 0.080), providing evidence against the idea that low-density exoplanets form from metal-poor environments. The low density and large radius of HATS-8b results in an atmospheric scale height of almost 1000 km, and in addition to this there is an excellent reference star of nearly equal magnitude at just 19' separation in the sky. These factors make HATS-8b an exciting target for future atmospheric characterization studies, particularly for long-slit transmission spectroscopy. |
Keywords | planetary systems; stars: individual: HATS-8; techniques:; photometric; techniques: spectroscopic; Astrophysics - Earth and; Planetary Astrophysics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | University of Geneva, Switzerland |
Princeton University, United States | |
Pontifical Catholic University of Chile, Chile | |
Max Planck Society, Germany | |
University of Hawaii, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Australian National University | |
University of California, United States | |
Hungarian Astronomical Association, Hungary |
https://research.usq.edu.au/item/q6x28/hats-8b-a-low-density-transiting-super-neptune
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