The TESS-Keck Survey. XII. A Dense 1.8 R⊕ Ultra-short-period Planet Possibly Clinging to a High-mean-molecular-weight Atmosphere after the First Gigayear
Article
Article Title | The TESS-Keck Survey. XII. A Dense 1.8 R⊕ Ultra-short-period Planet Possibly Clinging to a High-mean-molecular-weight Atmosphere after the First Gigayear |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Rubenzahl, Ryan A., Dai, Fei, Howard, Andrew W., Lissauer, Jack J., Van Zandt, Judah, Beard, Corey, Giacalone, Steven, Akana Murphy, Joseph M., Chontos, Ashley, Lubin, Jack, Brinkman, Casey L., Tyler, Dakotah, MacDougall, Mason G., Rice, Malena, Dalba, Paul A., Mayo, Andrew W., Weiss, Lauren M., Polanski, Alex S., Blunt, Sarah, Yee, Samuel W., Hill, Michelle L., Angelo, Isabel, Turtelboom, Emma V., Holcomb, Rae, Behmard, Aida, Pidhorodetska, Daria, Batalha, Natalie M., Crossfield, Ian J. M., Dressing, Courtney, Fulton, Benjamin, Huber, Daniel, Isaacson, Howard, Kane, Stephen R., Petigura, Erik A., Robertson, Paul, Scarsdale, Nicholas, Mocnik, Teo, Fetherolf, Tara, Malavolta, Luca, Mortier, Annelies, Martinez Fiorenzano, Aldo and Pedani, Marco |
Journal Title | The Astronomical Journal |
Journal Citation | 167 (4) |
Article Number | 153 |
Number of Pages | 16 |
Year | 2024 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ad28bb |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ad28bb |
Abstract | The extreme environments of ultra-short-period planets (USPs) make excellent laboratories to study how exoplanets obtain, lose, retain, and/or regain gaseous atmospheres. We present the confirmation and characterization of the USP TOI-1347 b, a 1.8 ± 0.1 R⊕ planet on a 0.85 day orbit that was detected with photometry from the TESS mission. We measured radial velocities of the TOI-1347 system using Keck/HIRES and HARPS-N and found the USP to be unusually massive at 11.1 ± 1.2 M⊕. The measured mass and radius of TOI-1347 b imply an Earth-like bulk composition. A thin H/He envelope (>0.01% by mass) can be ruled out at high confidence. The system is between 1 and 1.8 Gyr old; therefore, intensive photoevaporation should have concluded. We detected a tentative phase-curve variation (3σ) and a secondary eclipse (2σ) in TESS photometry, which, if confirmed, could indicate the presence of a high-mean-molecular-weight atmosphere. We recommend additional optical and infrared observations to confirm the presence of an atmosphere and investigate its composition. |
Keywords | Super Earths ; Exoplanet detection methods; Transit photometry; Radial velocity; ts: Exoplanet astronomy; Exoplanet astronomy; Exoplanet atmospheres |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
Byline Affiliations | California Institute of Technology (Caltech), United States |
NASA Ames Research Center, United States | |
University of California Los Angeles, United States | |
University of California Irvine, United States | |
University of California Santa Cruz, United States | |
Princeton University, United States | |
University of Hawaii, United States | |
Yale University, United States | |
University of California Berkeley, United States | |
University of Notre Dame, United States | |
University of Kansas, United States | |
Northwestern University, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
University of California Riverside, United Sates | |
American Museum of Natural History, United States | |
NASA Exoplanet Science Institute, United States | |
Infrared Processing and Analysis Center (IPAC), United States | |
University of Sydney | |
Academic Registrar's Office | |
Centre for Astrophysics | |
School of Mathematics, Physics and Computing | |
Gemini Observatory, United States | |
NSF's National Optical Infrared Astronomy Research Laboratory (NOIRLab), United States | |
California State University San Marcos, United States | |
University of Padua, Italy | |
INAF Observatory of Astrophysics and Space Science, Italy | |
University of Birmingham, United Kingdom | |
Galileo Galilei Foundation - INAF, Spain |
https://research.usq.edu.au/item/z8586/the-tess-keck-survey-xii-a-dense-1-8-r-ultra-short-period-planet-possibly-clinging-to-a-high-mean-molecular-weight-atmosphere-after-the-first-gigayear
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