HD 21520 b: a warm sub-Neptune transiting a bright G dwarf
Article
Article Title | HD 21520 b: a warm sub-Neptune transiting a bright G dwarf |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Nies, Molly, Mireles, Ismael, Bouchy, François, Dragomir, Diana, Nicholson, Belinda A., Eisner, Nora L., Sousa, Sergio G., Collins, Karen A., Howell, Steve B., Ziegler, Carl, Hellier, Coel, Addison, Brett, Ballard, Sarah, Bowler, Brendan P., Briceno, César, Clark, Catherine A., Conti, Dennis M., Dumusque, Xavier, Edwards, Billy, Gnilka, Crystal L., Hobson, Melissa, Horner, Jonathan, Kane, Stephen R., Kielkopf, John, Lavie, Baptiste, Law, Nicholas, Lendl, Monika, Littlefield, Colin, Liu, Huigen, Mann, Andrew W., Mengel, Matthew W., Oddo, Dominic, Okumura, Jack, Palle, Enric, Plavchan, Peter, Psaridi, Angelica, Santos, Nuno C., Schwarz, Richard P., Shporer, Avi, Wittenmyer, Robert A., Wright, Duncan J, Zhang, Hui, Watanabe, David, Medina, Jennifer V., Villaseñor, Joel, Ting, Eric B., Christiansen, Jessie L., Winn, Joshua N., Stassun, Keivan G., Seager, S., Latham, David W. and Ricker, George R. |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 534 (4), pp. 3744-3760 |
Article Number | stae2079 |
Number of Pages | 22 |
Year | 2024 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stae2079 |
Web Address (URL) | https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stae2079/7750052 |
Abstract | We report the discovery and validation of HD 21520 b, a transiting planet found with TESS and orbiting a bright G dwarf (V=9.2, Tef f = 5871±62 K, R⋆ = 1.04±0.02 R⊙). HD 21520 b was originally alerted as a system (TOI-4320) consisting of two planet candidates with periods of 703.6 and 46.4 days. However, our analysis supports instead a single-planet system with an orbital period of 25.1292±0.0001 days and radius of 2.70 ± 0.09 R⊕. Three full transits in sectors 4, 30 and 31 match this period and have transit depths and durations in agreement with each other, as does a partial transit in sector 3. We also observe transits using CHEOPS and LCOGT. SOAR and Gemini high-resolution imaging do not indicate the presence of any nearby companions, and Minerva-Australis and CORALIE radial velocities rule out an on-target spectroscopic binary. Additionally, we use ESPRESSO radial velocities to obtain a tentative mass measurement of 7.9 +3.2 −3.0 M⊕, with a 3-σ upper limit of 17.7 M⊕. Due to the bright nature of its host and likely significant gas envelope of the planet, HD 21520 b is a promising candidate for further mass measurements and for atmospheric characterization. |
Keywords | planets and satellites: detection; exoplanets; planets and satellites: individual: (HD 21520); planetary systems |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510107. Planetary science (excl. solar system and planetary geology) |
510109. Stellar astronomy and planetary systems | |
Byline Affiliations | East Stroudsburg University, United States |
University of New Mexico, United States | |
University of Geneva, Switzerland | |
University of Oxford, United Kingdom | |
Centre for Astrophysics | |
Flatiron Institute, United States | |
University of Porto, Portugal | |
Center for Astrophysics Harvard and Smithsonian, United States | |
NASA Ames Research Center, United States | |
Stephen F. Austin State University, United States | |
Keele University, United Kingdom | |
Swinburne University of Technology | |
University of Florida, United States | |
University of Texas at Austin, United States | |
Cerro Tololo Inter-American Observatory, Chile | |
California Institute of Technology (Caltech), United States | |
NASA Exoplanet Science Institute, United States | |
American Association of Variable Star Observers, United States | |
Netherlands Institute for Space Research, Netherlands | |
University of California Riverside, United Sates | |
University of Louisville, United States | |
University of North Carolina at Chapel Hill, United States | |
Bay Area Environmental Research Institute, United States | |
Nanjing University, China | |
Instituto de Astrof´ısica de Canarias (IAC), Spain | |
University of La Laguna, Spain | |
George Mason University, United States | |
Massachusetts Institute of Technology, United States | |
Chinese Academy of Sciences, China | |
Planetary Discoveries, United States | |
Space Telescope Science Institute, United States | |
Infrared Processing and Analysis Center (IPAC), United States | |
Princeton University, United States | |
Vanderbilt University, United States | |
MIT Kavli Institute for Astrophysics and Space Research, United States |
https://research.usq.edu.au/item/z9847/hd-21520-b-a-warm-sub-neptune-transiting-a-bright-g-dwarf
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