Discovery and Characterization of an Eccentric, Warm Saturn Transiting the Solar Analog TOI-4994
Article
Martinez, Romy Rodríguez, Eastman, Jason D., Collins, Karen A., Rodriguez, Joseph E., Charbonneau, David, Quinn, Samuel N., Latham, David W., Ziegler, Carl, Brahm, Rafael, Fairnington, Tyler R., Ulmer-Moll, SolÉne, Stassun, Keivan G., Suarez, Olga, Guillot, Tristan, Hobson, Melissa J., Winn, Joshua N., Kanodia, Shubham, Schlecker, Martin, Butler, R. P., ..., Mireles, Ismael. 2025. "Discovery and Characterization of an Eccentric, Warm Saturn Transiting the Solar Analog TOI-4994." The Astronomical Journal. 169 (2). https://doi.org/10.3847/1538-3881/ad9b90
Article Title | Discovery and Characterization of an Eccentric, Warm Saturn Transiting the Solar Analog TOI-4994 |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Martinez, Romy Rodríguez, Eastman, Jason D., Collins, Karen A., Rodriguez, Joseph E., Charbonneau, David, Quinn, Samuel N., Latham, David W., Ziegler, Carl, Brahm, Rafael, Fairnington, Tyler R., Ulmer-Moll, SolÉne, Stassun, Keivan G., Suarez, Olga, Guillot, Tristan, Hobson, Melissa J., Winn, Joshua N., Kanodia, Shubham, Schlecker, Martin, Butler, R. P., Crane, Jeffrey D., Shectman, Steve, Teske, Johanna K., Osip, David, Beletsky, Yuri, Battley, Matthew P., Psaridi, Angelica, Figueira, Pedro, Lendl, Monika, Bouchy, François, Udry, Stéphane, Kunimoto, Michelle, Mekarnia, Djamel, Abe, Lyu, Trifonov, Trifon, Tala Pinto, Marcelo, Eberhardt, Jan, Espinoza, Nestor, Henning, Thomas, Jordan, Andrés, Rojas, Felipe I., Barkaoui, Khalid, Relles, Howard M., Srdoc, Gregor, Collins, Kevin I., Seager, Sara, Shporer, Avi, Vezie, Michael, Hedges, Christina and Mireles, Ismael |
Journal Title | The Astronomical Journal |
Journal Citation | 169 (2) |
Article Number | 72 |
Number of Pages | 12 |
Year | 2025 |
Publisher | IOP Publishing |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ad9b90 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ad9b90 |
Abstract | We present the detection and characterization of TOI-4994b (TIC 277128619b), a warm Saturn-sized planet discovered by the NASA Transiting Exoplanet Survey Satellite. TOI-4994b transits a G-type star (V = 12.6 mag) with a mass, radius, and effective temperature of M ? = 1.00 5 ? 0.061 + 0.064 M ? , R ? = 1.05 5 ? 0.037 + 0.040 R ? , and Teff = 5640 ± 110 K. We obtained follow-up ground-based photometry from the Las Cumbres Observatory and the Antarctic Search for Transiting ExoPlanets telescopes, and we confirmed the planetary nature of TOI-4994b with multiple radial velocity observations from the Planet Finder Spectrograph, CHIRON, High Accuracy Radial velocity Planet Searcher, Fiber-fed Extended Range Optical Spectrograph, and CORALIE instruments. From a global fit to the photometry and radial velocities, we determine that TOI-4994b is in a 21.5 day eccentric orbit (e = 0.32 ± 0.04) and has a mass of M P = 0.28 0 ? 0.034 + 0.037 M J , a radius of R P = 0.76 2 ? 0.027 + 0.030 R J , and a Saturn-like bulk density of ? p = 0.7 8 ? 0.14 + 0.16 g cm - 3 . We find that TOI-4994 is a potentially viable candidate for follow-up stellar obliquity measurements. TOI-4994b joins the small sample of warm Saturn analogs and thus sheds light on our understanding of these rare and unique worlds. |
Keywords | Extrasolar gaseous planets; Exoplanets |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
Byline Affiliations | Center for Astrophysics Harvard and Smithsonian, United States |
Michigan State University, United States | |
Stephen F. Austin State University, United States | |
Adolfo Ibanez University, Chile | |
Millennium Institute for Astrophysics, Chile | |
Centre for Astrophysics | |
University of Geneva, Switzerland | |
Vanderbilt University, United States | |
Côte d’Azur University, France | |
Princeton University, United States | |
Carnegie Science Earth and Planets Laboratory, United States | |
University of Arizona, United States | |
Massachusetts Institute of Technology, United States | |
Max Planck Institute for Astronomy, Germany | |
Sofia University, Bulgaria | |
Heidelberg University, Germany | |
Space Telescope Science Institute, United States | |
Kotizarovci Observatory, Croatia | |
George Mason University, United States | |
NASA Goddard Space Flight Center, United States | |
University of New Mexico, United States |
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https://research.usq.edu.au/item/zx150/discovery-and-characterization-of-an-eccentric-warm-saturn-transiting-the-solar-analog-toi-4994
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