HD 56414 b: A Warm Neptune Transiting an A-type Star
We report the discovery in TESS data and validation of HD 56414 b (a.k.a. TOI-1228 b), a Neptune-size (Rp = 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...
| Main Authors: | , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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American Astronomical Society
2023
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| Online Access: | https://hdl.handle.net/1721.1/148481 |
| _version_ | 1826201359764946944 |
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| author | Giacalone, Steven Dressing, Courtney D Muñoz, 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 Briceño, César Huang, Chelsea X Rodriguez, David R Shporer, Avi Mann, Andrew W Watanabe, David Wohler, Bill |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Giacalone, Steven Dressing, Courtney D Muñoz, 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 Briceño, César Huang, Chelsea X Rodriguez, David R Shporer, Avi Mann, Andrew W Watanabe, David Wohler, Bill |
| author_sort | Giacalone, Steven |
| collection | MIT |
| description | We report the discovery in TESS data and validation of HD 56414 b (a.k.a. TOI-1228 b), a Neptune-size
(Rp = 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 (Teff = 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. |
| first_indexed | 2024-09-23T11:50:46Z |
| format | Article |
| id | mit-1721.1/148481 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T11:50:46Z |
| publishDate | 2023 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/1484812023-03-11T03:30:45Z HD 56414 b: A Warm Neptune Transiting an A-type Star Giacalone, Steven Dressing, Courtney D Muñoz, 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 Briceño, César Huang, Chelsea X Rodriguez, David R Shporer, Avi Mann, Andrew W Watanabe, David Wohler, Bill Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences We report the discovery in TESS data and validation of HD 56414 b (a.k.a. TOI-1228 b), a Neptune-size (Rp = 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 (Teff = 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. 2023-03-10T19:24:27Z 2023-03-10T19:24:27Z 2022 2023-03-10T19:10:47Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/148481 Giacalone, Steven, Dressing, Courtney D, Muñoz, A García, Hooton, Matthew J, Stassun, Keivan G et al. 2022. "HD 56414 b: A Warm Neptune Transiting an A-type Star." The Astrophysical Journal Letters, 935 (1). en 10.3847/2041-8213/AC80F4 The Astrophysical Journal Letters Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf American Astronomical Society The American Astronomical Society |
| spellingShingle | Giacalone, Steven Dressing, Courtney D Muñoz, 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 Briceño, César Huang, Chelsea X Rodriguez, David R Shporer, Avi Mann, Andrew W Watanabe, David Wohler, Bill HD 56414 b: A Warm Neptune Transiting an A-type Star |
| title | HD 56414 b: A Warm Neptune Transiting an A-type Star |
| title_full | HD 56414 b: A Warm Neptune Transiting an A-type Star |
| title_fullStr | HD 56414 b: A Warm Neptune Transiting an A-type Star |
| title_full_unstemmed | HD 56414 b: A Warm Neptune Transiting an A-type Star |
| title_short | HD 56414 b: A Warm Neptune Transiting an A-type Star |
| title_sort | hd 56414 b a warm neptune transiting an a type star |
| url | https://hdl.handle.net/1721.1/148481 |
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