The TESS-Keck Survey. XIII. An Eccentric Hot Neptune with a Similar-mass Outer Companion around TOI-1272
Article
Article Title | The TESS-Keck Survey. XIII. An Eccentric Hot Neptune with a Similar-mass Outer Companion around TOI-1272 |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | MacDougall, Mason G., Petigura, Erik A., Fetherolf, Tara, Beard, Corey, Lubin, Jack, Angelo, Isabel, Batalha, Natalie, Behmard, Aida, Blunt, Sarah, Brinkman, Casey L., Chontos, Ashley, Crossfield, Ian J. M., Dai, Fei, Dalba, Paul A., Dressing, Courtney, Fulton, Benjamin, Giacalone, Steven, Hill, Michelle L., Howard, Andrew W., Huber, Daniel, Isaacson, Howard, Kane, Stephen R., Kosiarek, Molly R., Mayo, Andrew W., Mocnik, Teo, Akana Murphy, Joseph M., Pidhorodetska, Daria, Polanski, Alex, Rice, Malena, Robertson, Paul, Rosenthal, Lee J., Roy, Arpita, Rubenzahl, Ryan A., Scarsdale, Nicholas, Turtelboom, Emma V., Tyler, Dakotah, Van Zandt, Judah, Weiss, Lauren M., Esparza-Borges, Emma, Fukui, Akihiko, Isogai, Keisuke I., Kawauchi, Kiyoe, Mori, Mayuko, Murgas, Felipe, Narita, Norio, Nishiumi, Taku, Palle, Enric, Parviainen, Hannu, Watanabe, Noriharu, Jenkins, Jon M., Latham, David W., Ricker, George R., Seager, S., Vanderspek, Roland, Winn, Joshua N., Bieryla, Allyson, Caldwell, Douglas A., Dragomir, Diana, Fausnaugh, Michael, Mireles, Ismael and Rodriguez, David R. |
Journal Title | The Astronomical Journal |
Journal Citation | 164 (3), pp. 164-197 |
Article Number | 97 |
Number of Pages | 14 |
Year | 2022 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ac7ce1 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ac7ce1 |
Abstract | We report the discovery of an eccentric hot Neptune and a non-transiting outer planet around TOI-1272. We identified the eccentricity of the inner planet, with an orbital period of 3.3 days and Rp,b = 4.1 ± 0.2 R⊕, based on a mismatch between the observed transit duration and the expected duration for a circular orbit. Using ground-based radial velocity (RV) measurements from the HIRES instrument at the Keck Observatory, we measured the mass of TOI-1272b to be Mp,b = 25 ± 2 M⊕. We also confirmed a high eccentricity of eb = 0.34 ± 0.06, placing TOI-1272b among the most eccentric well-characterized sub-Jovians. We used these RV measurements to also identify a non-transiting outer companion on an 8.7 day orbit with a similar mass of Mp,c sin i = 27 ± 3 M⊕ and ec ≲ 0.35. Dynamically stable planet–planet interactions have likely allowed TOI-1272b to avoid tidal eccentricity decay despite the short circularization timescale expected for a close-in eccentric Neptune. TOI-1272b also maintains an envelope mass fraction of fenv ≈ 11% despite its high equilibrium temperature, implying that it may currently be undergoing photoevaporation. This planet joins a small population of short-period Neptune-like planets within the "Hot Neptune Desert" with a poorly understood formation pathway. |
Keywords | ncepts: Exoplanets ; Hot Neptunes; Eccentricity |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
Byline Affiliations | University of California, United States |
California Institute of Technology (Caltech), United States | |
University of Hawaii, United States | |
University of Kansas, United States | |
University of California Berkeley, United States | |
NASA Exoplanet Science Institute, United States | |
Centre for Astrophysics | |
Gemini Observatory, United States | |
Yale University, United States | |
Space Telescope Science Institute, United States | |
Johns Hopkins University, United States | |
University of Notre Dame, United States | |
Institute of Astrophysics of the Canary Islands, Spain | |
University of La Laguna, Spain | |
University of Tokyo, Japan | |
Kyoto University, Japan | |
Graduate University for Advanced Studies, Japan | |
Massachusetts Institute of Technology, United States | |
NASA Ames Research Center, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Princeton University, United States | |
University of New Mexico, United States |
https://research.usq.edu.au/item/z0262/the-tess-keck-survey-xiii-an-eccentric-hot-neptune-with-a-similar-mass-outer-companion-around-toi-1272
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