HD 56414 b: A Warm Neptune Transiting an A-type Star
Article
Article Title | HD 56414 b: A Warm Neptune Transiting an A-type Star |
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ERA Journal ID | 45091 |
Article Category | Article |
Authors | Giacalone, Steven, Dressing, Courtney D., Munoz, A. García, Hooton, Matthew J., Stassun, Keivan G., Quinn, Samuel N., Zhou, George, Ziegler, Carl, Vanderspek, Roland, Latham, David W., Seager, S., Winn, Joshua N., Jenkins, Jon M., Briceno, Cesar, Huang, Chelsea X., Rodriguez, David R., Shporer, Avi, Mann, Andrew W., Watanabe, David and Wohler, Bill |
Journal Title | The Astrophysical Journal Letters |
Journal Citation | 935 (1), pp. 1-9 |
Article Number | L10 |
Number of Pages | 9 |
Year | 2022 |
Publisher | IOP Publishing |
Place of Publication | United Kingdom |
ISSN | 2041-8205 |
2041-8213 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/2041-8213/ac80f4 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/2041-8213/ac80f4 |
Abstract | We report the discovery in TESS data and validation of HD 56414 b (a.k.a. TOI-1228 b), a Neptune-size (R p = 3.71 ± 0.20 R ⊕) planet with a 29 day orbital period transiting a young (age = 420 ± 140 Myr) A-type star in the TESS southern continuous-viewing zone. HD 56414 is one of the hottest stars (T eff = 8500 ± 150 K) to host a known sub-Jovian planet. HD 56414 b lies on the boundary of the hot Neptune desert in the planet radius-bolometric insolation flux space, suggesting that the planet may be experiencing mass loss. To explore this, we apply a photoevaporation model that incorporates the high near-ultraviolet continuum emission of A-type stars. We find that the planet can retain most of its atmosphere over the typical 1 Gyr main-sequence lifetime of an A-type star if its mass is ≥8 M ⊕. Our model also predicts that close-in Neptune-size planets with masses <14 M ⊕ are susceptible to total atmospheric stripping over 1 Gyr, hinting that the hot Neptune desert, which has been previously observed around FGKM-type stars, likely extends to A-type stars. |
Keywords | Exoplanet astronomy; Exoplanet system; Exoplanet evolution; Transits |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Funder | National Science Foundation |
Byline Affiliations | University of California, United States |
Paris-Saclay University, France | |
University of Cambridge, United Kingdom | |
Vanderbilt University, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Centre for Astrophysics | |
Stephen F. Austin State University, United States | |
Massachusetts Institute of Technology, United States | |
Princeton University, United States | |
NASA Ames Research Center, United States | |
SOAR Telescope/NSF's NOIRLab, Chile | |
School of Mathematics, Physics and Computing | |
Space Telescope Science Institute, United States | |
University of North Carolina, United States | |
Planetary Discoveries, United States | |
SETI Institute, United States |
https://research.usq.edu.au/item/x41y0/hd-56414-b-a-warm-neptune-transiting-an-a-type-star
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